Atlas ACFoam-III Grade-II Polyiso CGF Roof Insulation, 3 in. x 4 ft. x 4 ft., 20 psi3 in. Polyiso Roof Insulation Board, 4x4, 20 psi Closed cell polyisocyanurate roof insulation with fiber reinforced organic felt facers for durable thermal performance. This 3 inch board delivers long term thermal resistance (LTTR) in a compact 4 ft. x 4 ft. sheet, ideal for commercial and residential roofing assemblies. Key Features: Durable Construction: Closed cell polyiso core bonded to non asphaltic, fiber reinforced organic felt facers for

3 in. Polyiso Roof Insulation Board, 4x4, 20 psi

Closed-cell polyisocyanurate roof insulation with fiber-reinforced organic felt facers for durable thermal performance. This 3-inch board delivers long-term thermal resistance (LTTR) in a compact 4 ft. x 4 ft. sheet, ideal for commercial and residential roofing assemblies.

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Key Features:

• Durable Construction: Closed-cell polyiso core bonded to non-asphaltic, fiber-reinforced organic felt facers for strength and moisture resistance
• High Compressive Strength: Grade-II 20 psi rating supports typical roofing loads
• Thermal Efficiency: Designed to provide long-term thermal resistance (LTTR) across roofing systems
• Code Compliant: Meets major standards including ASTM C1289, CAN/ULC-S704, UL and FM approvals, Miami-Dade and Florida Product Approvals
• Convenient Size: 3 in. thickness in a 4 ft. x 4 ft. board for easy handling and layout

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Specifications Table:

Specification	Details
Product Name	ACFoam-III Grade-II Polyiso CGF Roof Insulation
Dimensions	3 in. x 4 ft. x 4 ft.
Thickness	3" (76.2 mm)
Length	4' (1220 mm)
Width	4' (1220 mm)
Compressive Strength	20 psi (Grade-II)
Core Material	Closed-cell polyisocyanurate (polyiso)
Facers	Non-asphaltic, fiber-reinforced organic felt facers
Area Coverage	256 sq. ft. per unit
Weight	10 lb (per item listed)
Style	Polyiso
Applicable Standards/Approvals	ASTM C1289; CAN/ULC-S704; CCMC No. 12423-L; UL Certified for Canada; UL 1256; UL 790 (ASTM E108); UL 263 (ASTM E119); UL 1897; FM 4450/4470; IBC Chapter 26 & NBC; California State; Miami-Dade County Approved; Florida Product Approved; Greenguard Certified; RCI Approved; NRCA Approved; AIA Approved; U.S. Green Building Council Member

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Frequently Asked Questions (FAQ):

Q: What are the board dimensions and thickness?
A: Each board is 4 ft. x 4 ft. with a 3 in. thickness.

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Q: What is the compressive strength rating?
A: Grade-II board with a 20 psi compressive strength.

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Q: What facers are used on this insulation?
A: Non-asphaltic, fiber-reinforced organic felt facers are integrally bonded to the polyiso core.

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Q: Which codes and standards does it meet?
A: Complies with ASTM C1289 and CAN/ULC-S704 and carries multiple UL and FM approvals, plus Miami-Dade and Florida Product Approvals.

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Q: Where can I find technical documentation?
A: Product data sheet, SDS, fastening guide, specification guide, EPD, and approvals are available via Atlas resource links.

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Sculpted Warmth for the Modern Roofline

This polyiso board streamlines the silhouette of a roof while quietly elevating performance. The fiber-reinforced felt facer offers a refined, matte plane that layers beautifully beneath membranes. Pair it with crisp metal edge details to create an intentional, tailored profile. Consider it a discreet luxury—essential insulation that perfects comfort and form.

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Choose Atlas ACFoam-III to add reliable thermal performance and code-ready strength to your next roofing project.

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