2" x 4' x 8' polyiso roof insulation board (glass facer)

GAF EnergyGuard Iso is a rigid polyisocyanurate (polyiso) insulation board designed for commercial roofing applications. The 2"-thick, 4' x 8' sheet helps improve thermal performance while providing durable glass-fiber-reinforced facer surfaces.

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Key Features:

• Rigid Polyiso Core: Polyisocyanurate foam insulation panel designed for high thermal value in roofing assemblies.
• Glass-Reinforced Facers: Glass fiber reinforced facer layers help provide a durable surface for commercial roof systems.
• Standard 4' x 8' Coverage: Large-format sheet helps cover roof areas efficiently with fewer seams.
• 2-Inch Thickness: Provides a thicker insulation layer option for building up roof insulation packages.

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Specifications Table:

Specification	Details
Brand	GAF
Product line	EnergyGuard Iso
Product type	Polyiso insulation board
F facer type	Glass facer
Thickness	2.0 in
Sheet size	4 ft x 8 ft
Unit of measure	Sheet
Category	Insulation & Weatherproofing
Sub-category	Flat & Fan Fold Rigid Insulation Boards

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Frequently Asked Questions (FAQ):

Q: What size is each board?
A: Each sheet is 4' x 8' and 2" thick.

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Q: What is this insulation typically used for?
A: It’s a rigid polyiso board commonly used in commercial/low-slope roofing insulation assemblies.

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Q: Does this board have a facer?
A: Yes—this variant is listed as an “Iso Glass Facer,” and EnergyGuard Polyiso is described with glass-fiber-reinforced facer materials.

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Q: How is it usually installed?
A: Installation varies by roof system; it’s typically placed in layers as part of a commercial roof assembly per project and manufacturer requirements.

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A Crisp, Architectural Layer of Performance

Think of this polyiso board as the quiet, architectural layer that makes a space feel effortless—cooler in summer, warmer in winter, and inherently more refined. The glass-facer finish reads clean and technical, like a perfectly tailored understructure. Use it as the performance backbone in a modern roofing build where details matter as much as durability. It’s the kind of invisible essential that elevates the entire experience of living well.

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Choose GAF EnergyGuard Iso Glass Facer polyiso boards to build a more energy-smart roof assembly with dependable rigid insulation performance.