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Insulation Price Increases September 2026

2 manufacturer price-increase letters from 2 brands taking effect in September 2026. Every row links to the original letter or posting.

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EffectiveBrandProductsIncreaseSource
Sep 30, 2026 Johns Manville Polyiso Foam Sheathing 8% letter · Performance Pro Supply
Sep 1, 2026 Knauf Insulation see letter letter · ABC Supply Interiors