#1SAINT-GOBAIN TO ACQUIRE BUILDING PRODUCTS OF CANADA CORP. JUNE 12, 2023#2BUILDING PRODUCTS OF CANADA ACQUISITION HAS A COMPELLING STRATEGIC RATIONALE GROW & IMPACT Building Products of Canada acquisition fully aligned with Saint-Gobain strategy on light and sustainable construction Strengthen Group presence in North America with a leading position in Canada Enrich our product portfolio to offer complete solutions for the Canadian market Value-creating and growth-driven acquisition for Saint-Gobain's shareholders and customers 2 SAINT-GOBAIN#3ACQUISITION IS ALIGNED WITH SAINT-GOBAIN STRATEGY BP WORLDWIDE LEADER IN LIGHT & SUSTAINABLE CONSTRUCTION BUILDING PRODUCTS OF CANADA CORP. EXCEL TECEL GROW & IMPACT Sustainability Performance Leading roofing position in Canada Leading supplier of sustainable wood fiber insulation Together, Saint-Gobain and Building Products of Canada offer a comprehensive portfolio of solutions for the growing Canadian market 3 SAINT-GOBAIN#4ACQUISITION WILL FURTHER REINFORCE A STRONG TRACK RECORD OF GROWTH IN NORTH AMERICAN REGION 4certainteed SAINT-GOBAIN Only North American manufacturer offering a full breadth of building materials for light construction Preferred brand for contractors and homeowners, partnered with leading distribution channels Powerful organization driving market outperformance US$7.3bn Sales1 +16% Sales CAGR 18-221 GROW & IMPACT 20% EBITDA margin¹ PLASTERBOARD INSULATION ACOUSTIC CEILINGS ROOFING SIDING GRACE GRACE WATERPROOFING MEMBRANES GRAC ROOFING MEMBRANES 1. 2022 pro forma with annualized sales of acquisitions (Kaycan and GCP) #1 building materials manufacturer in North America Interior Exterior 4 SAINT-GOBAIN#5CANADA IS A KEY GROWTH MARKET FOR SAINT-GOBAIN Strong Market Perspectives 5.8m 1 units needed by 2030 in Canada to meet demand ~4% CAGR² Population Growth Supports New Build 3 Population increase due to >400k/year high immigration (~1% of 75%³ 2022 Canadian population) GROW & IMPACT Aging Housing Stock Supports Renovation of Canada's single family housing stock >20 years old >10% x3 Canada population growth 2022-20304 Population CAGR 2022 - 2030 Canada vs. OECD average4 Growing need for solutions for light and sustainable construction 1234 1. 2. 3. Canada Mortgage and Housing Corporation 2022 2030 CAGR Ducker Primary Research and Analysis, Investor Reports 4. OECD Population Projections data set 5 SAINT-GOBAIN#6SAINT-GOBAIN CANADA IS A LEADER IN LIGHT CONSTRUCTION Canada is a growing and profitable country for Saint-Gobain... C$1.4bn Sales1 +25% 18% Sales CAGR 18-221 EBITDA margin¹ GROW & IMPACT Saint-Gobain has a leading position in interior solutions and siding in Canada But a very limited presence in roofing with no manufacturing capability in Canada Roofing Siding KAYCAN ...with strong channel partnerships with leading retail, lumberyards, and buying groups THE DEPOT HOME RONA SEXTON GROUP LTD Ah Home hardware 1. 2022 pro forma with annualized sales of acquisitions (Kaycan and GCP) CertainTeed SAINT-GOBAIN TIMBER MART® Gypsum wallboard & finishing Specialty ceilings Insulation 6 SAINT-GOBAIN#7BUILDING PRODUCTS OF CANADA IS A LEADING ROOFING PLAYER IN CANADA BP C$435m C$111 m 25% 3 460 2022 Revenues 2022 EBITDA 2022 EBITDA margin Manufacturing Plants Employees BUILDING PRODUCTS OF CANADA CORP. A broad exterior solutions platform, complementary to CertainTeed's product portfolio STRONG POSITION in shingles in Canada Complementary offering in high growth EXTERIOR WOOD FIBER INSULATION One of only 2 roofing manufacturers established domestically with NATIONAL REACH ACROSS CANADA Strong customer relationships with HOME CENTER RETAILERS and SPECIALTY DISTRIBUTION INSONORISANT SoundSma NDPROOFING Panel www.bpcan.com Roofing Shingles 80% Underlayment Wood Fiber Insulating Panel 20% Wood Fiber Acoustic Panel GROW & IMPACT 7 SAINT-GOBAIN#8BUILDING PRODUCTS OF CANADA ACQUISITION IS A LOGICAL STEP IN OUR PROFITABLE GROWTH TRAJECTORY IN CANADA We have built a comprehensive offer in 18 months while doubling in size GROW & IMPACT 11 Manufacturing plants Exterior solutions C$0.9bn 2022 PF1 Interior solutions certainteed SAINT-GOBAIN Exterior solutions 21 Manufacturing plants C$1.4bn 2022 PF2 Interior solutions Exterior solutions 24 Manufacturing plants C$1.8bn 2022 PF2 Interior solutions Ecertainteed + KAYCAN + SAINT-GOBAIN gcp Ecertainteed + KAYCAN + SAINT-GOBAIN gcp+P Enriching our offer in each country to bring complete solutions for light and sustainable construction 12 1. Pro forma excluding acquisitions (Kaycan and GCP) 2. Pro forma with annualized sales of acquisitions (Kaycan and GCP) BUILDING PRODUCTS OF CANADA CORP. 8 SAINT-GOBAIN#9M ACQUISITION IS A PERFECT FIT FOR SAINT-GOBAIN IN CANADA Building Products of Canada brings leadership position in roofing and completes Saint-Gobain's exterior solutions portfolio CEL EXCEL EXCE certainteed SAINT-GOBAIN Ceilings Gypsum Insulation KAYCAN BP Roofing and wood fiber Siding дер Building envelope Manufacturing footprint well-positioned to serve all major markets Lightweight and sustainable 100% recyclable and made of recycled wood Serves growing demand for sustainable insulation Leader in the growing wood fiber industry 9 SAINT-GOBAIN GROW & IMPACT#10BUILDING PRODUCTS OF CANADA FURTHER EXPANDS EXTERIOR SOLUTIONS IN CANADA BP BUILDING PRODUCTS OF CANADA CORP. EXTERIOR SOLUTIONS Siding (vinyl, metal, engineered wood) Shakes Accessories Wood fiber insulation Ceilings Roofing shingles Plasterboard Glass wool insulation INTERIOR SOLUTIONS Roofing membranes Waterproofing membranes GROW & IMPACT 1 10 SAINT-GOBAIN#11SAINT-GOBAIN HAS A LEADING POSITION IN US ROOFING 4 certainteed ROOFING SAINT-GOBAIN ROOFING A KEY COMPONENT FOR LIGHT CONSTRUCTION Shingles Cat Carte Chan Certaffed Certifeet Castles Cases Inawer nde Wed ed CertainTeed Certainteed CertainTeed Cet Underlayment Par Centenar Cand Commercial Accessories Solar 1. Sales CAGR 2018-2022 здо 185 ♡ هراء GROW & IMPACT US$2.7bn in revenues and LEADING PLAYER in the US with DOUBLE-DIGIT ANNUAL GROWTH1 85% SALES in renovation and remodeling (non-discretionary repairs) PREFERRED BRAND for contractors and homeowners driven by reputation for quality and service, and broadest solutions-based portfolio Recognized for its INNOVATION capabilities and its commitment to SUSTAINABILITY 11 SAINT-GOBAIN#12SHINGLES ARE THE MATERIAL OF CHOICE FOR RESIDENTIAL ROOFING IN NORTH AMERICA Shingles have the lowest installed cost of all roofing products Installed cost of a typical roof¹ [US$ in thousands] GROW & IMPACT Shingles offer one of the lowest carbon footprint among common roofing products Carbon emission factor of roofing products [kg CO2 equivalent per m² product] Shingles Tiles Steel/aluminium roof Composite Natural slate 1. 3,000 square feet or 280 m 0 10 20 30 Source: Management estimates Natural slate Shingles Concrete Ceramic/clay tiles Steel / aluminium roof 0 5 Source: Industry-wide Environmental Product Declarations (EPD) 10 15 12 обви SAINT-GOBAIN#13CANADA WILL FOLLOW SUCCESSFUL COMMERCIAL PATH OF USA Interior solutions certainteed Т SAINT-GOBAIN Gypsum Exterior solutions Roofing Insulation Siding Ceilings Since 2018, CertainTeed USA has leveraged one commercial team for residential exterior solutions GROW & IMPACT Combined back office and ease-to-do business across all exterior solutions Much improved sales coverage and customer territory management Enhanced competitive positioning thanks to cross-selling opportunities Strong organization driving growth and market outperformance in the United States Building Envelope +11% Roofing and Siding growth (sales CAGR 2018 - 2022) +4 pts Gain in share in siding (2022 vs. 2018) with Country Key Account Management 13 SAINT-GOBAIN#14SAINT-GOBAIN IS CREATING A COMPELLING FULL-RANGE OFFER FOR ITS CUSTOMERS IN CANADA certainteed SAINT-GOBAIN A trusted player, recognized for the quality of its products GROW & IMPACT • Leverage our innovation for unique full-range solutions Enrich Building Products of Canada offer with CertainTeed roofing solutions (all-weather/ solar reflective / premium shingles...) and GCP underlayments (Ice & Water ShieldⓇ membrane) Leverage Saint-Gobain technologies for roofing Lighter and stronger shingles • Utilization of existing Offer CertainTeed building integrated photovoltaic shingles Solstice Shingle • manufacturing capacities Codevelopment with Adfors on next-gen binder and glass fibers ADFORS SAINT-GOBAIN Creating more value for our customers Drive sustainability • • Leverage CertainTeed circular economy know-how and partnership with Asphaltica Leverage Saint-Gobain experience in plant decarbonization ASPHALTICA ASPHALT INNOVATIONS 14 SAINT-GOBAIN#15SAINT-GOBAIN HAS A PROVEN TRACK RECORD OF INTEGRATION AND EXCEEDING SYNERGIES IN NORTH AMERICA CONTINENTAL BUILDING PRODUCTS Value creation in year 2 Successful integration and synergies exceeding plan KAYCAN Synergies ahead of plan Notably in purchasing savings gcp Synergies ahead of plan Notably in supply chain and manufacturing efficiencies Highly experienced local teams committed to delivering on value creation GROW & IMPACT 15 SAINT-GOBAIN#16Cost synergies STRONG VALUE CREATION IS SUPPORTED BY SIGNIFICANT SYNERGIES Procurement Operations GROW & IMPACT Align contracts on best rates for key inputs and further reduce prices with economies of scale ✓ CertainTeed purchase volumes >8x greater than Building Products of Canada • Backward integration on various critical raw materials Manufacturing efficiencies via Saint-Gobain World Class Manufacturing expertise ✓ Up to 10% higher productivity (squares per hour) in CertainTeed roofing plants vs. Building Products of Canada plants Network optimization reducing freight costs - Total synergies (excl. Implementation costs) — EBITDA impact C$ m 50 20 35 SG&A Leverage Canadian organization for excellence in sales and back office Leverage scale effects 13 15 7 Top line Same route-to-market bringing cross-selling opportunities with Kaycan ⚫ Offer enrichment with CertainTeed, GCP, and Saint-Gobain products Leverage Building Products of Canada's channels to cross-sell other Saint-Gobain product categories 10 Year 1 Year 2 Year 3 Conseil d'Administration - Juin 2023 16 لمى SAINT-GOBAIN#17TRANSACTION OVERVIEW Enterprise Value of C$1,325m, i.e. 11.9x 2022 EBITDA multiple, 8.2x including full synergies (C$50m) • FINANCIAL TERMS . Value creation by Year 3 EPS accretive from Year 1 FINANCING • Acquisition financed fully in cash • Limited impact on net debt to EBITDA ratio (+0.1x), leverage remaining below the target set (1.5x to 2.0x) TRANSACTION PROCESS . • Share purchase agreement signed • Closing expected by year end 2023, subject to customary conditions GROW & IMPACT 1 17 SAINT-GOBAIN#18A DECISIVE AND LOGICAL STEP TO STRENGTHEN SAINT-GOBAIN LEADERSHIP IN LIGHT & SUSTAINABLE CONSTRUCTION IN NORTH AMERICA GROW & IMPACT Π MAKING THE WORLD A BETTER Π HO ME Enrich and reinforce Roofing and Exterior Solutions Strengthen Group presence in North America Very solid team to deliver strong value creation A value-creating and growth-driven acquisition for Saint-Gobain's shareholders and customers 18 SAINT-GOBAIN#19GROW & IMPACT لكى SAINT-GOBAIN