Westlake Growth & Investment Strategy

Closer to the Customer with Value-Added Name Brands Flagship Brands Growth Opportunities Name Value Brands make up the majority of Westlake Royal Building Products offering that drive higher and more stable margins Siding & Accessories Trim & Molding Roofing US TAM* Market Positions • ROYAL Siding Vinyl siding provides lowest installed cost Majority is driven by stable R&R spend ~$10B TruExterior • Siding & Irim Strong housing construction demand #1 Non-wood Shutters #3 Premium Siding ROYAL Trim & Mouldings KLEER Displacing wood and other alternatives • Strong housing construction demand Stable R&R spend ~$3B #1 Premium PVC Trim #1 Poly-Ash Trim NEWPOINT CONCRETE ROOF TILE USTile Clay Roofing Products DAVINCI Roufaxopes #1 Concrete & Clay Tile Displacing natural slate and other alternatives Strong housing construction demand Majority is driven by stable R&R spend ~$15B #1 Composite Tile #2 Stone Coated Metal STONECRAFT ~80% of Sales Go through 1 Step distributors who sell to the final customer enhancing margins over two-step distribution Decorative Stone • ELDORADO STONE • VERSETTA STONE Legacy Collection Windows Krestmark Collection Outdoor Living ZURI KINDRED CUTDOORS SURROLES REMILY DECKING 60 Housing construction and R&R spend Market leading brands support demand Westlake's innovation in cultured stone ~$4B #1 Architectural Stone Veneer Magnolia Collection Leveraging strength in Texas and other regions New home construction demand Stable R&R spend provides additional support • Displacing wood decking • Growing outdoor trends post-pandemic Market leading brands appeal to consumers • Attractive aesthetics Leading position in attractively growing Texas market and surrounding areas Leveraging leading brands driving higher penetration in Outdoor Living Westlake Source: Principia, Freedonia, Fortune Business Advisors. *TAM: Total addressable market

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