GAF 3 in. 4 ft x 4 ft EnergyGuard Grade-II (20 psi) Polyiso Roof Insulation Panel

This is a GAF EnergyGuard Grade-II (20 psi) polyisocyanurate roof insulation panel measuring 4 ft x 4 ft and 3 in. thick, with glass fiber reinforced cellulosic felt facers bonded to a polyiso foam core. Each panel covers 16 sq ft and bundles of 16 cover 256 sq ft. It installs in low-slope roof systems as insulation or tapered fill and pairs with GAF single-ply, mod-bit and BUR membranes.

Key Features:

• High thermal value: Polyisocyanurate foam core provides high thermal efficiency for low-slope commercial roofs.
• 20 psi Grade II: Meets ASTM C1289 Type II, Class 1 Grade 2 (20 psi) compressive strength classification.
• System approvals: Approved for use with modified bitumen, BUR and single-ply roof systems.
• Third-party listed: FM Approved 4450/4470, UL 1256/790/263, Miami-Dade County and State of Florida approved.
• Recycled content: Green Circle Certified for recycled content and contributes to green building rating systems.
• Easy handling: Lightweight panels are easy to cut in the field for faster installation.
• Tapered system ready: Works within GAF EnergyGuard tapered designs that help drive water to roof drains.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 4 ft panel covers 16 sq ft; a 16-piece bundle covers 256 sq ft (4 squares per bundle). Divide your roof area by 16 sq ft per panel to size the job, and follow the tapered layout plan for slope direction.

Fit and Compatibility:

Compatible with GAF EnergyGuard tapered insulation systems and with TPO and PVC membranes in adhered, mechanically attached and induction welded systems, plus mod-bit and BUR assemblies. Membranes, adhesives and fasteners are sold separately.

Frequently Asked Questions (FAQ):

Q: What is included in one sell unit?
A: Each selling unit is one 4 ft x 4 ft, 3 in. thick panel; panels ship 16 to a bundle covering 256 sq ft.

Q: How many panels do I need?
A: Divide your roof area in square feet by 16 (the coverage of one 4 ft x 4 ft panel); one 16-piece bundle covers 256 sq ft.

Q: Can this be used in a tapered roof design?
A: Yes, it is part of the GAF EnergyGuard tapered polyiso system, available in slopes from 1/16 in. to 1/2 in. per foot in standard and extended panels.

Q: What compressive strength does it have?
A: It is ASTM C1289 Type II, Class 1 Grade 2, rated at 20 psi minimum compressive strength.

Q: Which roof systems is it approved for?
A: It is system-approved for modified bitumen, BUR and single-ply assemblies, including TPO and PVC in adhered, mechanically attached and induction welded systems.

Q: How is it installed?
A: Install per the GAF tapered design and data sheet; panels are lightweight and cut easily in the field, and can be attached with fasteners or low-rise foam per system requirements.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Use 20 psi Grade-II polyiso where standard ballast or membrane traffic loads are moderate; step up to Grade-III (25 psi) for heavier duty assemblies. In tapered designs, order the full slope schedule from a tapered layout so panels nest correctly and water drains to the design point. Keep panels dry before install and stagger joints per the data sheet, with a cover board where a UL Class A assembly over combustible decks requires one.

Follow the manufacturer's installation instructions, data sheet and local code, and use appropriate fall protection when working on low-slope roofs.

Order GAF EnergyGuard Grade-II 20 psi polyiso insulation for your next low-slope roofing project.