
Insulated Sheathing & Structural Insulation: New Trends in Exterior Walls
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Building codes in Ontario are pushing for higher energy efficiency, and one of the fastest-growing solutions is insulated sheathing and structural insulation products. Contractors are increasingly using these materials to meet performance targets and reduce thermal bridging. Hereās what you need to know.
What is Insulated Sheathing?
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A rigid foam board or composite panel installed on the exterior of walls.
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Provides continuous insulation across studs to reduce energy loss.
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Common types: Polyiso, EPS (Expanded Polystyrene), and XPS (Extruded Polystyrene).
Benefits for Contractors
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Meets and exceeds Ontario Building Code energy efficiency requirements.
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Reduces thermal bridging compared to batts alone.
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Enhances air sealing and moisture resistance.
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Cuts heating and cooling costs for homeowners.
Popular Products
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Foam Board Insulation (EPS/XPS) ā widely used in residential builds.
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Polyiso Boards ā high R-value per inch, often used in commercial.
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Structural Insulated Panels (SIPs) ā pre-fabricated panels combining sheathing + insulation.
Average Costs (Ontario 2025)
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EPS Foam Board (1" thick, 4x8 panel): $25ā$35.
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XPS Foam Board: $35ā$50 per 4x8 panel.
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Polyiso Board: $40ā$60 per 4x8 panel.
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SIP Panels: $7ā$12 per sq ft (installed).
Where to Buy in the GTA
Big box stores carry limited foam board, but dedicated suppliers like Confirmed Construction Materials (ConfirmedCM) stock EPS, XPS, Polyiso, and SIP options with contractor pricing and delivery.