WEST FRASER. 3rd Quarter 2017 For the period July 1 to September 30, 2017

WEST FRASER 3rd Quarter 2017 For the period July 1 to September 30, 2017

Report to Shareholders Third Quarter Highlights Completed acquisition of six sawmills and a finger-joint mill in Florida and Georgia Adjusted EBITDA of $269 million for the quarter Quarter ending net debt to capital ratio of 16% Results Compared to Previous Periods 2 Report to Shareholders ($ millions except earnings per share ( EPS )) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Sales 1,247 1,322 3,758 1,155 3,343 Adjusted EBITDA 1 269 305 819 213 481 Operating earnings 177 217 577 156 355 Earnings 120 146 389 107 247 Basic EPS ($) 1.53 1.86 4.97 1.35 3.06 Adjusted earnings 1 150 174 458 115 229 Adjusted basic EPS ($) 1 1.93 2.23 5.87 1.45 2.84 1. In this Report, reference is made to Adjusted EBITDA, Adjusted earnings and Adjusted basic EPS (collectively these measures ). We believe that, in addition to earnings, these measures are useful performance indicators. None of these measures is a generally accepted earnings measure under International Financial Reporting Standards ( IFRS ) and none has a standardized meaning prescribed by IFRS. Investors are cautioned that these measures should not be considered as an alternative to earnings, EPS or cash flow, as determined in accordance with IFRS. As there is no standardized method of calculating any of these measures, our method of calculating each of them may differ from the methods used by other entities and, accordingly, our use of any of these measures may not be directly comparable to similarly titled measures used by other entities. Refer to the tables in the section titled Non-IFRS Measures in our third quarter 2017 Management s Discussion & Analysis for details of these adjustments. Gilman acquisition On August 31, 2017 we completed the acquisition of the Gilman Companies for net cash consideration of $525 million (US$418 million). The Gilman Companies are comprised of six sawmills and a finger-joint mill in Florida and Georgia as well as an administrative office in St. Marys, Georgia. Ted Seraphim, our President and CEO said, We are delighted to welcome the Gilman leadership and employees to the West Fraser family. This acquisition is a major step in our growth strategy as we expand our lumber business in the United States. Forest fires in British Columbia and hurricanes in the U.S. South A number of wildfires throughout the interior region of British Columbia resulted in a provincial state of emergency being declared from July 7 to September 15, 2017. Our operations in 100 Mile House, Williams Lake and Chasm were briefly suspended due to the wildfires, reducing our production by 55 MMfbm of lumber and 15 Msf of plywood. The 2017 hurricane season was more severe than normal causing significant damage to areas in South East Texas and Florida. We were fortunate that our facilities were undamaged and that disruptions to our operations were minimal. Operational Results Our lumber segment generated operating earnings of $126 million (Q2-17 $171 million) and Adjusted EBITDA of $195 million (Q2-17 $240 million). This quarter s results were negatively impacted by lower product pricing and lower SPF production as a result of the British Columbia forest fires. Countervailing and antidumping duties, which commenced in the previous quarter, resulted in an expense of $31 million for the current quarter. Our panels segment generated operating earnings in the quarter of $45 million (Q2-17 $23 million) and Adjusted EBITDA of $48 million (Q2-17 $26 million). Improved plywood pricing was the primary driver of improved results. Our pulp & paper segment generated operating earnings of $21 million (Q2-17 $32 million) and Adjusted EBITDA of $30 million (Q2-17 $42 million). The major factors contributing to the decrease in operating earnings were lower Canadian dollar pulp prices and increased maintenance costs from our Hinton pulp mill major maintenance shutdown.

Softwood lumber dispute The U.S. Department of Commerce s preliminary review resulted in a West Fraser specific countervailing duty rate of 24.12% effective April 28, 2017 and an antidumping duty rate of 6.76% effective June 30, 2017, resulting in an expense of $31 million for the current quarter and $65 million for the first nine months of 2017. The requirement that we pay countervailing duties was suspended on August 24, 2017 until final determination is determined by the U.S. International Trade Commission. The Company West Fraser is a diversified wood products company producing lumber, LVL, MDF, plywood, pulp, newsprint, wood chips and energy with facilities in western Canada and the southern United States. Forward-Looking Statements This Report contains historical information, descriptions of current circumstances and statements about potential future developments. The latter, which are forward-looking statements, are presented to provide reasonable guidance to the reader but their accuracy depends on a number of assumptions and is subject to various risks and uncertainties. Actual outcomes and results will depend on a number of factors that could affect the ability of the Company to execute its business plans, including those matters described in the 2016 annual Management s Discussion & Analysis under Risks and Uncertainties, and may differ materially from those anticipated or projected. Accordingly, readers should exercise caution in relying upon forward-looking statements and the Company undertakes no obligation to publicly revise them to reflect subsequent events or circumstances, except as required by applicable securities laws. On behalf of the Board of Directors, WEST FRASER TIMBER CO. LTD. 53 Report to Shareholders REPORT TO SHAREHOLDERS Ted Seraphim President and Chief Executive Officer October 23, 2017

Management s Discussion & Analysis Introduction and Interpretation This discussion and analysis by West Fraser s management ( MD&A ) of the Company s financial performance during the third quarter of 2017 should be read in conjunction with the unaudited condensed consolidated interim financial statements and accompanying notes ( Financial Statements ) included in this quarterly report and the 2016 annual MD&A included in the Company s 2016 Annual Report. Dollar amounts are expressed in Canadian currency, unless otherwise indicated. The financial information contained in this MD&A has been prepared in accordance with International Financial Reporting Standards ( IFRS ) except as otherwise disclosed. 4 Management s Discussion & Analysis This MD&A contains historical information, descriptions of current circumstances and statements about potential future developments and anticipated financial results. The latter, which are forward-looking statements, are presented to provide reasonable guidance to the reader but their accuracy depends on a number of assumptions and are subject to various risks and uncertainties. Forward-looking statements are included under the headings Business Outlook, and Recent Developments (concerning the softwood lumber dispute and forest fires in British Columbia). Actual outcomes and results of these statements will depend on a number of factors including those matters described under Risks and Uncertainties in the 2016 annual MD&A, and may differ materially from those anticipated or projected. Accordingly, readers should exercise caution in relying upon forward-looking statements and we undertake no obligation to publicly revise them to reflect subsequent events or circumstances except as required by applicable securities laws. Throughout this MD&A reference is made to Adjusted EBITDA, Adjusted earnings, Adjusted basic earnings per share and net debt to total capital ratio (collectively these measures ), calculated as shown under the heading Non-IFRS Measures in this report. We believe that, in addition to earnings, earnings per share and cash flow, these measures are useful performance indicators. None of these measures is a generally accepted earnings measure under IFRS and none has a standardized meaning prescribed by IFRS. Investors are cautioned that none of these measures should be considered as an alternative to earnings, earnings per share or cash flow, as determined in accordance with IFRS. As there is no standardized method of calculating any of these measures, our method of calculating each of them may differ from the methods used by other entities and, accordingly, our use of any of these measures may not be directly comparable to similarly titled measures used by other entities. This MD&A uses the following terms that are defined in the Company s 2016 Annual Report: SPF (Spruce-Pine-Fir lumber); SYP (Southern Yellow Pine lumber); MDF (Medium Density Fibreboard); LVL (Laminated Veneer Lumber); BCTMP (Bleached Chemi-thermomechanical pulp) and NBSK (Northern Bleached Softwood Kraft pulp). This MD&A includes references to benchmark prices over selected periods for products of the type produced by West Fraser. These benchmark prices do not necessarily reflect the prices obtained by West Fraser for those products during such period. The information in this MD&A is as at October 23, 2017 unless otherwise indicated. Recent Developments Softwood lumber dispute On November 25, 2016 a coalition of U.S. lumber producers petitioned the U.S. Department of Commerce ( USDOC ) and the U.S. International Trade Commission ( USITC ) to investigate alleged subsidies to Canadian producers and levy countervailing and antidumping duties against Canadian softwood lumber imports. We were chosen by the USDOC as a mandatory respondent to both the countervailing and antidumping investigations and as a result were assigned a unique company specific preliminary countervailing duty rate of 24.12% effective April 28, 2017 and a preliminary antidumping duty rate of 6.76% effective June 30, 2017, resulting in an expense of $31 million during the current quarter and $65 million for the first nine months of 2017. Together with other Canadian forest product companies, the federal government and Canadian provincial governments ( Canadian Interests ) we categorically deny the allegations by the coalition of U.S. lumber producers and disagree with the preliminary countervailing and antidumping determinations by the USDOC. Depending on the outcome of the final phase of the investigations, Canadian Interests may appeal the decision of the USDOC and USITC to the appropriate courts, North America Free Trade Agreement panels and/or the World Trade Organization. The USDOC is expected to announce final rates by November 13, 2017. The USITC is expected to make a ruling on injury not later than January 4, 2018. The requirement that we pay countervailing duties was suspended on August 24, 2017 until final determination is published by the USITC. Notwithstanding the rates assigned under the investigations, our final liability for the assessment of countervailing and antidumping duties will not be determined until each annual administrative review process is complete.

Forest fires in British Columbia The 2017 wildfire season is considered to have been one of the worst in British Columbia s history with the provincial state of emergency lasting from July 7 to September 15, 2017. Many communities were evacuated including those where our 100 Mile, Williams Lake and Chasm facilities are located. We were fortunate that our facilities were undamaged but the disruption caused us to lose 55 MMFBM of lumber production and 15 MSF of plywood production while the mills were closed. Throughout this period our British Columbia facilities faced logging restrictions, transportation delays and many of our employees were displaced. By the end of September we had returned to normal production and transportation schedules and were in the process of ramping back up to preinterruption production levels. The province of British Columbia estimates that approximately 1 million hectares of timber has been lost due to the forest fires. We are working with the government to revise our current and long-term logging plans, including plans to salvage burnt timber. At this time it is too early to gauge the long-term impact on lumber operations in British Columbia. Hurricanes in the U.S. South The 2017 hurricane season was more severe than normal causing significant damage to areas in South East Texas in August and Florida in September. We were fortunate that our facilities were undamaged and that disruptions to our operations were minimal. Markets were interrupted while communities dealt with the storms and their aftermath but by the end of September activity had returned to more normal levels. Gilman Acquisition On August 31, 2017 we completed the acquisition of six sawmills and a finger-joint mill (the Gilman Acquisition ) for net cash consideration of $525 million (US$418 million). These SYP mills are located in Florida and Georgia and have an annual lumber production capacity of approximately 700 million board feet. After considering estimated tax benefits, the purchase price represents approximately six times trailing 12 months EBITDA of the acquired operations. The Gilman Acquisition was financed with cash on hand, borrowings under our revolving credit facility, and a new $250 million (US$200 million) acquisition term loan which matures on August 25, 2022, and is pre-payable at the Company s option without penalty. This acquisition represents an important step in increasing our geographic diversification through an expansion of our U.S. lumber operations. We are pleased to have acquired a group of high quality sawmills in a good timber basket, with high operating margins, close to a large customer base and with a strong management team that is excited to join West Fraser. Integration of the acquired mills is well underway with the migration of most major information technology systems and organizational alignment completed during the quarter. Summary Information 5 Management s Discussion & Analysis ($millions) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Sales 1,247 1,322 3,758 1,155 3,343 Adjusted EBITDA 269 305 819 213 481 Export duties (31) (34) (65) Equity-based compensation (10) ( 5 ) (26) ( 7 ) 21 Amortization (51) (49) (151) (50) (147) Operating earnings 177 217 577 156 355 Finance expense (8) (8) (23) (7) (22) Other (2) (1) (3) 1 (8) Tax provision (47) (62) (162) (43) (78) Earnings 120 146 389 107 247 CAD$1.00 converted to US$ average 0.798 0.744 0.766 0.767 0.757 Selected Quarterly Information ($millions, except earnings per share ( EPS ) amounts which are in $) Q3-17 Q2-17 Q1-17 Q4-16 Q3-16 Q2-16 Q1-16 Q4-15 Sales 1,247 1,322 1,189 1,107 1,155 1,111 1,077 1,013 Earnings 120 146 123 79 107 98 42 (15) Basic EPS 1.53 1.86 1.58 1.01 1.35 1.22 0.51 ( 0.18 ) Diluted EPS 1.53 1.86 1.58 1.01 1.35 0.86 0.50 ( 0.18 )

2017 Management s Discussion & Analysis (continued) Discussion & Analysis of Non-Operational Items Adjusted Earnings and Adjusted Basic Earnings Per Share 1 6 Management s Discussion & Analysis ($millions, except EPS amounts which are in $) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Earnings 120 146 389 107 247 Adjustments: Export duties 31 34 65 Equity-based compensation 10 5 26 7 (21) Exchange on long-term financing (5 ) (4) (10) 2 (8) Loss on power agreements 19 Insurance gain on disposal of equipment (5) Net tax effect on the above adjustments (6) (7) (12) (1) (3) Adjusted earnings 150 174 458 115 229 Adjusted basic EPS 2 1.93 2.23 5.87 1.45 2.84 1. Adjusted earnings and Adjusted basic EPS are Non-IFRS measures. We believe that, in addition to earnings, earnings per share and cash flow, these measures are useful performance indicators. Refer to the heading Non-IFRS measures in this MD&A. 2. Adjusted basic EPS is calculated by dividing Adjusted earnings by the basic weighted average shares outstanding. Export duties of $31 million were expensed in the quarter compared to $34 million in the previous quarter and nil in the third quarter of 2016. We believe that the U.S. allegations of subsidy and dumping are unwarranted and that the preliminary rates applied will be adjusted. See Softwood lumber dispute under the heading Recent Developments in this MD&A for further information. Our equity-based compensation includes our share purchase option, phantom share unit, and directors deferred share unit plans (the Plans ), all of which have been partially hedged by an equity derivative contract. The Plans are fair valued each quarter and the resulting expense or recovery is recorded over the related vesting period. Our fair valuation models consider various factors with the most significant being the change in the market value of our shares from the beginning to the end of the relevant period. In the fourth quarter of 2016, we entered into an equity derivative contract that had the effect of hedging 1,000,000 equity-based securities at a share price of $46.02. The hedge is marked-to-market each quarter and the resulting gain or loss is included in equity-based compensation. The expense or recovery does not necessarily represent the actual value which will ultimately be received by the holders of share purchase options and units. Any change in the value of the Canadian dollar relative to the value of the U.S. dollar results in the revaluation of our U.S. dollar-denominated assets and liabilities. The result of these revaluations is included in other income. The table above lists the exchange gains recorded on long-term financing during the periods presented. Exchange gains or losses realized on working capital are identified under Other Non-operation Items below. During 2016 we terminated and finalized the settlement for our three-year power strip agreement and our Power Purchase Agreements. These agreements had provided us with a portion of the electricity generated from two power plants in Alberta at substantially predetermined prices. This termination resulted in a $19 million loss that was recorded as other income in the first quarter of 2016. Our WestPine MDF facility experienced a fire during the first quarter of 2016 resulting in production being suspended while the mill was repaired. A $5 million gain on disposal, related to estimated insurance proceeds, was recorded in other income in the second quarter of 2016. Other Non-operational Items Other income includes an exchange loss on working capital of $7 million compared to $4 million in the previous quarter and an exchange gain of $2 million in the third quarter of 2016. The results of the current quarter include a provision for income tax of $47 million compared to $62 million in the previous quarter and $43 million for the third quarter of 2016. The effective tax rate was 28% in the current quarter compared to 30% in the previous quarter and 29% in the third quarter of 2016. Note 10 to the Financial Statements provides a reconciliation of income taxes calculated at the statutory rate to the income tax expense. The province of British Columbia has announced an increase to the corporate tax rate from 11% to 12%. If enacted, we estimate this change will result in a one-time adjustment to future income tax expense in the period of $4 million associated with the re-measurement of future income tax assets and liabilities.

The funded position of our defined benefit pension plans and other retirement benefit plans is estimated at the end of each quarter. The funded position, as shown in Note 7 to the Financial Statements, is determined by subtracting the value of plan assets from the value of plan obligations. An increase in the discount rate used to calculate plan liabilities from the beginning of the current period and an actual rate of return on assets that was higher than the discount rate, resulted in a third quarter after-tax actuarial gain of $39 million which is included in other comprehensive earnings. DISCUSSION & ANALYSIS BY PRODUCT SEGMENT Lumber Segment Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 SPF (MMfbm) Production 924 1,011 2,906 954 2,899 Shipments 934 971 2,810 986 2,935 SYP (MMfbm) Production 602 562 1,718 541 1,640 Shipments 621 558 1,694 546 1,637 Sales ($millions) Lumber 782 839 2,343 709 2,051 Wood chips and other residuals 84 86 247 81 245 Logs and other 23 21 81 24 71 889 946 2,671 814 2,367 Adjusted EBITDA ($millions) 195 240 626 151 364 Export duties (31) (34) (65) Amortization ($millions) (38) (35) (112) (37) (109) Operating earnings ($millions) 126 171 449 114 255 Adjusted EBITDA margin (%) 22 25 23 19 15 Benchmark prices (per Mfbm) SPF #2 & Better 2 x 4 1 US$ 406 388 380 322 302 SPF #3 Utility 1 US$ 326 332 315 245 233 SYP #2 West 2 x 4 2 US$ 382 455 431 410 401 SPF #2 & Better 2 x 4 CAD$ 3 509 522 497 420 399 SPF #3 Utility CAD$ 3 408 447 412 320 308 SYP #2 West 2 x 4 CAD$ 3 479 612 563 535 530 1. Source: Random Lengths Net FOB mill. 2. Source: Random Lengths Net FOB mill Westside. 3. Calculated by applying the average Canadian/U.S. dollar exchange rate for the period to the U.S. dollar benchmark price. 7 Management s Discussion & Analysis As discussed previously, we completed the acquisition of six sawmills and a finger-joint mill on August 31, 2017 for net cash consideration of $525 million (US$418 million). During the month of September, these mills generated sales of $31 million. Purchase price accounting requires that acquired inventory is valued at fair value, which approximates selling prices. After accounting for the increased value assigned to the acquired inventory and costs associated with the rapid integration of systems, the acquired operations did not make a material contribution to operating earnings in the one month following acquisition. Acquisition costs of $1 million were expensed during the quarter. Operating earnings were lower for the current quarter compared to the previous quarter due primarily to lower Canadian dollar sales prices, SYP in particular, and lower SPF production as a result of the British Columbia forest fires. Operating earnings were higher for the current quarter compared to the third quarter of 2016 due primarily to higher SPF prices. This was partially offset by export duties of $31 million and higher Canadian log costs. Canadian log costs increased due to an increase in purchase log costs and higher stumpage rates associated with the logging of green-wood as we continue to transition away from beetle-killed timber. Lower SYP prices were offset by lower log costs. Operating earnings were higher for the first nine months of the year compared to the same period of 2016 due primarily to higher lumber prices. SYP benefited from lower log costs while SPF incurred export duties of $65 million and higher log costs. Our 2017 shipments were disrupted by forest fires in British Columbia, hurricanes in Southeast U.S. and other weather related delays, resulting in shipments being lower than production on a year-to-date basis.

2017 Management s Discussion & Analysis (continued) Panels Segment Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 8 Management s Discussion & Analysis Plywood (MMsf 3 /8 basis) Production 205 215 629 212 619 Shipments 195 217 618 212 619 MDF (MMsf 3 /4 basis) Production 55 47 135 36 125 Shipments 53 43 131 35 134 LVL (Mcf) Production 616 729 2,019 548 1,631 Shipments 653 657 1,975 611 1,670 Sales ($millions) Finished products 163 143 428 132 386 Wood chips and other residuals 4 5 13 5 14 Logs and other 1 1 4 2 5 168 149 445 139 405 Adjusted EBITDA ($millions) 48 26 89 33 69 Amortization ($millions) (3) (3) (9) (3) (9 ) Operating earnings ($millions) 45 23 80 30 60 Adjusted EBITDA margin (%) 29 17 20 24 17 Benchmark price Plywood (per Msf 3 /8 basis) 1 CAD$ 640 488 520 471 436 1. Source: Crow s Market Report Delivered Toronto. Our panels segment is comprised of our plywood, MDF and LVL operations. Our WestPine MDF plant, which was closed March 9, 2016 due to a fire, began producing board on April 29, 2017 and is progressing as expected. Operating earnings increased for all comparative periods presented due primarily to higher plywood pricing. We increased LVL production for the first nine months of 2017 to meet increased market demand. LVL is primarily used in new single family home construction.

Pulp & Paper Segment Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 BCTMP (Mtonnes) Production 167 166 502 169 493 Shipments 139 177 502 181 505 NBSK (Mtonnes) Production 117 120 376 137 394 Shipments 121 131 390 127 387 Newsprint (Mtonnes) Production 31 30 92 31 95 Shipments 32 29 92 31 97 Sales ($millions) 221 260 735 230 656 Adjusted EBITDA ($millions) 30 42 112 31 49 Amortization ($millions) (9 ) (10 ) (28 ) (9) (27) Operating earnings ($millions) 21 32 84 22 22 Adjusted EBITDA margin (%) 14 16 15 13 7 Benchmark price (per tonne) NBSK U.S. US$ 1,3 1,110 1,093 1,079 998 974 NBSK China US$ 2,3 670 670 662 595 601 Newsprint US$ 4 575 575 575 575 554 NBSK U.S. CAD$ 5 1,391 1,470 1,411 1,302 1,287 NBSK China CAD$ 5 839 901 865 776 794 Newsprint CAD$ 5 720 773 752 750 732 1. Source: Resource Information Systems, Inc. U.S. list price delivered U.S. 2. Source: Resource Information Systems, Inc. China list price delivered China. 3. The differences between the U.S. and China NBSK list prices are largely attributable to the customary sales practice of applying material discounts from the U.S. list price for North American sales compared to relatively small discounts from the China list price for sales into China. 4. Source: Resource Information Systems, Inc. delivered 48.8 gram newsprint. 5. Calculated by applying the average Canadian/U.S. dollar exchange rate for the period to the U.S. dollar benchmark price. The pulp & paper segment is comprised of our NBSK, BCTMP and newsprint businesses. Operating earnings for the current quarter were lower than previous quarter due to lower Canadian dollar pulp prices and higher maintenance spending from the Hinton Pulp mill major maintenance shutdown. When compared to the prior quarter, NBSK production was slightly down but after adjusting both quarters for the major maintenance shutdown at our Hinton and Cariboo Pulp mills, production would have risen approximately 5% on a comparative basis. 9 Management s Discussion & Analysis Operating earnings were essentially flat compared to the third quarter of 2016 as higher pulp prices, particularly BCTMP, offset increased NBSK maintenance costs associated with the current quarter shutdown. NBSK production was down substantially in the current quarter due to the Hinton Pulp mill major maintenance shutdown. When compared to the prior year-to-date period, NBSK production was down modestly, about half of which was due to lost production due to maintenance shutdowns. However, operating earnings were up substantially due to increased pulp pricing, particularly BCTMP, partially offset by increased fibre costs and higher electricity pricing.

2017 Management s Discussion & Analysis (continued) BUSINESS OUTLOOK Markets We expect demand for softwood lumber to continue to improve as U.S. new home construction gradually returns to normal levels, spending on repair and renovation remains steady with potential hurricane related rebuilding efforts and export markets stabilize. There is however, the risk of a significant disruption to the regular flow of lumber from Canada to the U.S. as a result of the ongoing softwood lumber investigations by the USDOC which could be an impediment to spending in the U.S. housing market. The uncertainty created by the softwood lumber trade dispute has resulted in greater volatility and unpredictability in both demand and pricing in lumber markets which may continue until the situation is resolved. Plywood pricing peaked in the third quarter but has retreated in the fourth quarter. Global pulp prices are expected to increase in the fourth quarter. 10 Management s Discussion & Analysis Operations Our lumber production in the third quarter of 2017 exceeded production in the same quarter of 2016 by 31 MMfbm and exceeded production in the prior year to date period by 85 MMfbm. In the aggregate, we estimate that we lost approximately 65 MMfbm of production due to interruptions from the wildfires in British Columbia and the hurricanes in the US South. Order patterns continue to be more volatile than usual given the uncertainty caused by recent events including fires, hurricanes and the softwood lumber trade dispute. We project that we will exceed 2016 annual lumber production in 2017 by approximately 300 MMfbm, including the impact of the recently completed acquisition of the Gilman mills. Log costs are expected to continue to escalate in Canada for the balance of 2017. U.S. log costs are expected to remain relatively flat over the same period although there may be some pricing pressure in Texas and Louisiana as a result of the hurricanes. Approximately 1 million hectares of timber was burned during the wildfires this season in British Columbia. We are working with the British Columbian government to revise our current and long-term logging plans, including plans to salvage burnt timber. At this time it is too early to gauge the long-term impact on lumber operations in British Columbia. The restart of our WestPine MDF plant took place in the second quarter and we expect to reach targeted production levels before the end of 2017. Hinton s restart in the fourth quarter of 2017 was delayed due to availability of contractors, additional unscheduled repairs and start-up difficulties. Through October 23, the facility had lost production of approximately 13,000 additional tonnes following the start up as normal operations were being restored. Cash Flows We ended the quarter with a net debt to total capital ratio of 16%. Despite the cash deposits required for the U.S. imposed softwood lumber export duties, we continue to project strong cash flows sufficient to support our $300 million capital investment plan for 2017 as well as to maintain our recently increased dividend and investment grade rating. Our strategy has been to maintain a strong financial position so we can withstand the punitive (and unwarranted) softwood lumber duties and be in a position to take advantage of any future growth opportunities that may arise. We renewed our Normal Course Issuer Bid in September and we will continue to consider share repurchases if circumstances are supportive of such actions. CAPITAL STRUCTURE AND LIQUIDITY Our capital structure consists of Common share equity and long-term debt. On August 28, 2017 we were advanced a $250 million (US$200 million) 5 year term loan that matures on August 25, 2022 to fund the Gilman Acquisition. Interest is payable at floating rates based on Base Rate Advances or LIBOR Advances at our option. This loan is repayable at any time, in whole or in part, at our option and without penalty but cannot be redrawn after payment. We also extended the maturity date of our $500 million committed operating revolving credit facility to August 25, 2022. Our operating facilities include a $500 million committed revolving credit facility, a $31 million (US$25 million) demand line of credit dedicated to our U.S. operations and an $8 million demand line of credit dedicated to our jointly owned newsprint operation. In addition, we have demand lines of credit totalling $59 million dedicated to letters of credit of which US$7 million is committed to our U.S. operations. These facilities are available to meet our funding requirements. All debt is unsecured except the $8 million joint operation demand line of credit, which is secured by that joint operation s current assets. On September 30, 2017, there were no funds drawn under our operating facilities. Letters of credit in the amount of $47 million were supported by our facilities, leaving $551 million of credit available for further use.

Our outstanding Common share equity consists of 75,643,251 Common shares and 2,281,478 Class B Common shares for a total of 77,924,729 shares issued and outstanding as at October 23, 2017. Each Class B Common share may be, at any time, exchanged for one Common share. The rights attached to the Common shares and Class B Common shares are equal in all other respects, including the right to dividends and the right to vote. The Common shares are listed and traded on the Toronto Stock Exchange under the symbol WFT while our Class B Common shares are not. Certain circumstances or corporate transactions may require the approval of the holders of our Common shares and Class B Common shares on a separate class by class basis. On September 12, 2017, we announced the renewal of our Normal Course Issuer Bid program which allows us to acquire up to 3,794,375 Common shares for cancellation until the expiry of the bid on September 18, 2018. We purchased 552,404 shares at an average price of 55.85 under the program that expired September 18, 2017 and 85,094 shares at an average price of 68.52 under the new program that expires September 18, 2018. As of October 23, 2017, there were 1,768,115 share purchase options outstanding with exercise prices ranging from $12.36 to $73.99 per Common share. Our cash requirements, other than for operating purposes, are primarily for interest payments, repayment of debt, additions to property, plant, equipment and timber, acquisitions and payment of dividends. In normal business cycles and in years without a major acquisition or debt repayment, cash on hand and cash provided by operations have normally been sufficient to meet these requirements. Summary of Financial Position ($millions except as otherwise indicated) Q3-17 Q4-16 Q3-16 Cash 1 132 50 52 Current assets 1,108 938 937 Current liabilities 562 459 494 Ratio of current assets to current liabilities 2.0 2.0 1.9 Net debt 2 497 376 433 Shareholders equity 2,554 2,241 2,101 Net debt to total capital 3 16% 14% 17% 1. Cash consists of cash and short-term investments. 2. Total debt less deferred financing costs less cash plus cheques issued in excess of funds on deposit. 3. Non-IFRS measure. See Non-IFRS Measures in this MD&A. Debt Ratings As shown in the table below, we are rated by three leading rating agencies. All three ratings are considered investment grade. 11 Management s Discussion & Analysis Agency Rating Outlook Dominion Bond Rating Service BBB(low ) Stable Moody s Baa3 Stable Standard & Poor s BBB- Stable These ratings are not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time by the rating agencies.

2017 Management s Discussion & Analysis (continued) 12 Management s Discussion & Analysis Selected Cash Flow Items ($millions cash provided by (used in)) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Operating Activities Earnings 120 146 389 107 247 Amortization 51 49 151 50 147 Loss on power agreements, net of settlement costs 11 Change in inventories 22 156 17 5 89 Change in other working capital 75 (4) (20) 51 (36) Other 15 19 65 36 49 283 366 602 249 507 Financing Activities Debt and operating loans 250 (110) 250 (99) (133) Finance expense paid (1) (10) (12) (3) (14) Common share repurchases (17) (17) (58) (170) Dividends and other (11) (6) (22) (2) (14) 221 (126) 199 (162) (331) Investing Activities Aquisition (525) (525) Additions to capital assets (90) (78) (224) (76) (182) Other 2 3 6 2 9 (613) (75) (743) (74) (173) Increase (decrease) in cash (109) 165 58 13 3 Operating Activities Positive operating cash flows were produced from all of our operating segments, most significantly, the lumber segment. Seasonal inventory variations related to logging activities in the first and second quarter of each year influenced changes in working capital but returned closer to expected levels for the third quarter of 2017. Financing Activities The Gilman Acquisition was financed with cash on hand, borrowings under our revolving credit facility, and a new $250 million (US$200 million) acquisition term loan which matures on August 25, 2022, and is pre-payable at the Company s option without penalty. The revolving loan was repaid by the end of the current quarter. The Board of Directors of West Fraser increased the quarterly dividend on the Common shares and Class B Common shares of the Company from $0.07 per share to $0.11 per share beginning the third quarter of 2017. Dividend payments are under the discretion of the Board of Directors. Investing Activities As discussed previously, we completed the Gilman Acquisition of six sawmills and a finger-joint mill on August 31, 2017 for net cash consideration of $525 million (US$418 million). Additions to capital assets in the current quarter include $75 million for the lumber segment, $1 million for the panels segment, $12 million for the pulp & paper segment and $2 million for our corporate segment. NON-IFRS MEASURES The following summarizes the Non-IFRS Measures we use in this MD&A. None of these measures is a generally accepted measure under IFRS and none has a standardized meaning prescribed by IFRS. Investors are cautioned that none of these measures should be considered as an alternative to earnings, earnings per share or cash flow, as determined in accordance with IFRS. As there is no standardized method of calculating any of these measures, our method of calculating each of them may differ from the methods used by other entities and, accordingly, our use of any of these measures may not be directly comparable to similarly titled measures used by other entities.

Adjusted EBITDA ($millions) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Earnings 120 146 389 107 247 Add: Amortization 51 49 151 50 147 Finance expense 8 8 23 7 22 Tax provision 47 62 162 43 78 EBITDA 226 265 725 207 494 Add: Equity-based compensation 10 5 26 7 (21) Export duty 31 34 65 Other 2 1 3 (1) 8 Adjusted EBITDA 269 305 819 213 481 Adjusted EBITDA by Segment ($millions) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Lumber Earnings before tax 118 166 432 111 240 Add: Amortization 38 35 112 37 109 Finance expense 5 5 14 4 13 EBITDA 161 206 558 152 362 Add: Export duties 31 34 65 Other 3 3 (1) 2 Adjusted EBITDA 195 240 626 151 364 Panels Earnings before tax 44 22 77 29 60 Add: Amortization 3 3 9 3 9 Finance expense 1 1 3 1 3 EBITDA 48 26 89 33 72 Add: Other (3) Adjusted EBITDA 48 26 89 33 69 Pulp & Paper Earnings before tax 16 27 73 21 (5) Add: Amortization 9 10 28 9 27 Finance expense 2 2 6 2 6 EBITDA 27 39 107 32 28 Add: Other 3 3 5 (1) 21 Adjusted EBITDA 30 42 112 31 49 Corporate and Other Earnings before tax (11) (7) (31) (11) 30 Add: Amortization 1 1 2 1 2 EBITDA (10) (6) (29) (10) 32 Add: Equity-based compensation 10 5 26 7 (21) Other (4) (2) (5) 1 (12) Adjusted EBITDA (4) (3) (8) (2) (1) Total Adjusted EBITDA 269 305 819 213 481 13 Management s Discussion & Analysis

2017 Management s Discussion & Analysis (continued) 14 Management s Discussion & Analysis Adjusted Earnings and Adjusted Basic Earnings Per Share ($millions except EPS) Q3-17 Q2-17 YTD-17 Q3-16 YTD-16 Earnings 120 146 389 107 247 Adjustments: Export duties 31 34 65 Equity-based compensation 10 5 26 7 ( 21 ) Exchange on long-term financing (5) (4) (10) 2 (8) Loss on power agreements 19 Insurance gain on disposal of equipment ( 5 ) Net tax effect on the above adjustments (6) (7) (12) ( 1 ) ( 3 ) Adjusted earnings 150 174 458 115 229 Adjusted basic EPS 1 1.93 2.23 5.87 1.45 2.84 1. Adjusted basic EPS is calculated by dividing Adjusted earnings by the basic weighted average shares outstanding. Net Debt to Total Capital Ratio ($millions except as otherwise indicated) Q3-17 Q4-16 Q3-16 Net debt Cash and short-term investments (132) (50) (52) Deferred financing costs 1 (8) (6) (7) Cheques issued in excess of funds on deposit 15 36 Operating loan 49 Long-term debt (includes current portion) 637 417 407 497 376 433 Shareholders equity 2,554 2,241 2,101 Total capital 3,051 2,617 2,534 Net debt to total capital 16% 14% 17% 1. For our balance sheet presentation, these costs are applied to reduce the associated debt or, in instances when the operating loan is undrawn, these costs are included in other assets. RISKS AND UNCERTAINTIES For a review of the risks and uncertainties to which our Company is subject, see the 2016 annual MD&A which is included in our 2016 Annual Report. See also the discussion of risks relating to the softwood lumber dispute described above under the heading Recent Developments. SIGNIFICANT MANAGEMENT JUDGMENTS AFFECTING FINANCIAL RESULTS For a review of significant management judgments affecting financial results and critical accounting estimates, see the 2016 annual MD&A which is included in our 2016 Annual Report. Export duties The current softwood lumber dispute is the fifth such dispute since 1982. In the case of previous disputes, the preliminary duties levied were subject to significant reductions in the periods following the initial application. In the absence of any additional information, we have accrued countervailing and antidumping duties at our Company specific rates designated by the USDOC. These rates are subject to change based on administrative reviews and appeals available to us. Changes to the rates may be material and our results may be adjusted as new information becomes available. This may include adjustments to amounts already recorded as well as adjustments to the rates (if any) applicable to future periods. DISCLOSURE CONTROLS AND PROCEDURES AND INTERNAL CONTROL OVER FINANCIAL REPORTING Our management, including the President and Chief Executive Officer and the Vice-President, Finance and Chief Financial Officer, acknowledge responsibility for the design of disclosure controls and procedures and internal controls over financial reporting. There has been no change in our internal controls over financial reporting during the three months ended September 30, 2017 that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting. ADDITIONAL INFORMATION Additional information relating to our Company, including our Company s Annual Information Form, is available on SEDAR at www.sedar.com.

Condensed Consolidated Balance Sheets (In millions of Canadian dollars, except where indicated unaudited) Assets September 30 December 31 2017 2016 Current assets Cash and short-term investments $ 132 $ 50 Receivables 371 297 Inventories (note 4) 586 581 Prepaid expenses 19 10 1,108 938 Property, plant and equipment 1,869 1,685 Timber licences 538 551 Goodwill and other intangibles 707 371 Other assets 25 20 Deferred income tax assets 11 35 $ 4,258 $ 3,600 Liabilities Current liabilities Cheques issued in excess of funds on deposit $ $ 15 Payables and accrued liabilities 455 379 Income taxes payable 63 21 Reforestation and decommissioning obligations 44 44 562 459 Long-term debt (note 5) 632 413 Other liabilities (note 6) 286 272 Deferred income tax liabilities 224 215 1,704 1,359 15 Condensed Consolidated Balance Sheets Shareholders Equity Share capital 547 549 Accumulated other comprehensive earnings 105 150 Retained earnings 1,902 1,542 2,554 2,241 $ 4,258 $ 3,600 Number of Common shares and Class B Common shares outstanding at October 23, 2017 was 77,924,929.

Condensed Consolidated Statements of Changes in Shareholders Equity (In millions of Canadian dollars, except where indicated unaudited) July 1 to September 30 January 1 to September 30 2017 2016 2017 2016 Share capital Balance beginning of period $ 549 $ 560 $ 549 $ 579 Common share repurchases (2) (9) (2) (28) Balance end of period $ 547 $ 551 $ 547 $ 551 16 Condensed Consolidated Statements of Changes in Shareholders Equity Accumulated other comprehensive earnings Balance beginning of period $ 129 $ 129 $ 150 $ 164 Translation gain (loss) on foreign operations (24) 8 (45) ( 27 ) Balance end of period $ 105 $ 137 $ 105 $ 137 Retained earnings Balance beginning of period $ 1,767 $ 1,332 $ 1,542 $ 1,404 Actuarial gain {loss) on post-retirement benefits 39 26 6 (79) Common share repurchases (15) (47) (15) (142) Earnings for the period 120 107 389 247 Dividends (9) (5) (20) (17) Balance end of period $ 1,902 $ 1,413 $ 1,902 $ 1,413 Shareholders Equity $ 2,554 $ 2,101 $ 2,554 $ 2,101

Condensed Consolidated Statements of Earnings and Comprehensive Earnings (In millions of Canadian dollars, except where indicated unaudited) July 1 to September 30 January 1 to September 30 2017 2016 2017 2016 Sales $ 1,247 $ 1,155 $ 3,758 $ 3,343 Costs and expenses Cost of products sold 775 739 2,313 2,263 Freight and other distribution costs 153 158 484 473 Export duties 31 65 Amortization 51 50 151 147 Selling, general and administration 50 45 142 126 Equity-based compensation 10 7 26 (21) 1,070 999 3,181 2,988 Operating earnings 177 156 577 355 Finance expense (8) ( 7 ) (23) (22) Other (note 9) (2) 1 (3) (8) Earnings before tax 167 150 551 325 Tax provision (note 10) (47) (43) (162) (78) Earnings $ 120 $ 107 $ 389 $ 247 Earnings per share (dollars) (note 11) Basic $ 1.53 $ 1.35 $ 4.97 $ 3.06 Diluted $ 1.53 $ 1.35 $ 4.97 $ 2.73 Comprehensive earnings Earnings $ 120 $ 107 $ 389 $ 247 Other comprehensive earnings Translation gain (loss) on foreign operations (24) 8 (45) (27) Actuarial gain (loss) on post-retirement benefits 39 26 6 (79) Comprehensive earnings $ 135 $ 141 $ 350 $ 141 17 Condensed Consolidated Statements of Earnings and Comprehensive Earnings

Condensed Consolidated Statements of Cash Flows (In millions of Canadian dollars, except where indicated unaudited) 18 Condensed Consolidated Statements of Cash Flows July 1 to September 30 January 1 to September 30 2017 2016 2017 2016 Cash provided by operations Earnings $ 120 $ 107 $ 389 $ 247 Adjustments Amortization 51 50 151 147 Finance expense 8 7 23 22 Foreign exchange loss (gain) on long-term financing (5) 2 (10) (8) Loss on power agreements, net of settlement costs 11 Post-retirement expense 19 18 57 53 Contributions to post-retirement benefit plans (17) (18) (48) (46) Tax provision 47 43 162 78 Income taxes received (paid) (7) 6 (59) 1 Other (30) (22) (60) (51) Changes in non-cash working capital Receivables 31 ( 6 ) (49) (36) Inventories 22 5 17 89 Prepaid expenses 12 16 (6) 1 Payables and accrued liabilities 32 41 35 (1) 283 249 602 507 Cash provided by (used for) financing Proceeds from long-term debt 250 250 Repayment of operating loans (99) (133) Finance expense paid (1) (3) (12) (14) Dividends (9) (5) (20) (17) Common share repurchases (17) (58) (17) (170) Other (2) 3 (2) 3 221 (162) 199 ( 331 ) Cash used for investing Acquisition (note 3) (525) (525) Additions to capital assets (90) (76) (224) (182) Government assistance 1 1 2 8 Other 1 1 4 1 (613) (74) (743) (173) Change in cash (109) 13 58 3 Foreign exchange effect on cash 10 12 39 29 Cash beginning of period 231 (9) 35 (16) Cash end of period $ 132 $ 16 $ 132 $ 16 Cash consists of Cash and short-term investments $ 132 $ 52 Cheques issued in excess of funds on deposit (36) $ 132 $ 16

Notes to Condensed Consolidated Interim Financial Statements (Figures are in millions of Canadian dollars, except where indicated unaudited) 1. Nature of operations ( West Fraser, we, us or our ) is a diversified wood products company producing lumber, LVL, MDF, plywood, pulp, newsprint, wood chips and energy with facilities in western Canada and the southern United States. Our executive office is located at 858 Beatty Street, Suite 501, Vancouver, British Columbia. West Fraser was formed by articles of amalgamation under the Business Corporations Act (British Columbia) and is registered in British Columbia, Canada. Our Common shares are listed for trading on the Toronto Stock Exchange under the symbol WFT. 2. Basis of presentation and statement of compliance These condensed consolidated interim financial statements have been prepared in accordance with International Accounting Standard 34, Interim Financial Reporting as issued by the International Accounting Standards Board and use the same accounting policies and methods of their application as the December 31, 2016 annual financial statements. These condensed consolidated interim financial statements should be read in conjunction with our 2016 annual consolidated financial statements. 3. Gilman acquisition On August 31, 2017 we completed the acquisition of six SYP sawmills and a finger-joint mill in Florida and Georgia as well as an administrative office in Georgia (the Gilman Acquisition ). The consideration paid, net of cash acquired was $525 million (US$418 million) and the transaction was an acquisition of shares. The acquisition was financed with cash on hand, borrowings on our revolving credit facility and a $250 million (US$200 million) term loan. The purchase agreement contains indemnification provisions that are typical for a share purchase transaction. The acquisition has been accounted for as an acquisition of a business and we have allocated the purchase price based on our preliminary estimated fair value of the assets acquired and the liabilities assumed as follows: Preliminary September 30, 2017 Net assets acquired $ 606 Less cash acquired (81) Net non-cash assets acquired 525 Allocation: Current assets 63 Current liabilities (16) Property, plant and equipment 121 Other assets 6 Goodwill 337 Employee future benefits (13) Deferred income taxes, net 27 $ 525 19 Notes to Condensed Consolidated Interim Financial Statements The deferred income tax asset estimate of $27 million includes an asset of $51 million related to estimated net operating losses acquired, partially offset by a liability of $24 million related to temporary differences on other assets and liabilities. Factors contributing to goodwill include the Gilman workforce, assets that are geographically complementary to our existing facilities and offer close access to large markets, the good timber basket and multiple outlets for residuals. This transaction strengthens our core lumber business and gives us increased scale and geographic diversification. This was a rare opportunity to acquire a U.S. lumber producer of a meaningful scale with high quality facilities and a culture similar to our own. The goodwill of $337 million is not deductible for tax purposes. The following table shows the results of the Gilman Acquisition since the acquisition date and the estimated pro-forma West Fraser consolidated results as if we owned the Gilman Acquisition since January 1, 2017: Gilman West Fraser September 1 Pro-forma January 1 to 30, 2017 to September 30, 2017 Sales $ 31 $ 4,012 Earnings (loss) $ (1) $ 444