GAF EnergyGuard 1 in. x 4 ft. x 4 ft. Grade-II (20 psi) Polyiso Roof Insulation Panel

This is a GAF EnergyGuard 1 in. polyisocyanurate roof insulation panel in a 4 ft x 4 ft size, Grade-II (20 psi) with glass fiber reinforced cellulosic felt facers bonded to a polyiso foam core. Each panel provides 16 sq ft of coverage and ships as a single piece. It pairs with GAF single-ply, mod bit and BUR roof systems, including tapered designs.

Key Features:

• High thermal value: Polyisocyanurate foam core with glass fiber reinforced cellulosic felt facers delivers high thermal efficiency for low-slope roofs.
• 20 psi compressive strength: ASTM C1289 Type II, Class 1 Grade 2 rating provides 20 psi compressive strength.
• Compact 4x4 size: The 4 ft x 4 ft footprint is easier to handle and stage on crowded or cut-up roof layouts.
• System approvals: Approved for use in mod bit, BUR and single-ply systems with FM 4450/4470 and UL listings.
• Membrane compatible: Compatible with TPO and PVC membranes in adhered, mechanically attached and induction welded systems.
• Easy handling: Lightweight panels are easy to cut in the field for faster installation.
• Green building credit: Green Circle Certified for recycled content and contributes to green building rating systems.

Specifications Table:

Coverage & How Much You Need:

One panel covers 16 sq ft (4 ft x 4 ft). Bundles of 48 pieces cover 768 sq ft, so a 1,000 sq ft roof area needs about 63 panels. The smaller footprint reduces cutting waste on small or irregular areas.

Fit and Compatibility:

Compatible with GAF single-ply (TPO and PVC), modified bitumen and BUR roof systems in adhered, mechanically attached and induction welded applications. Membrane, adhesives and fasteners are sold separately; a cover board is required for UL Class A over combustible decks.

Frequently Asked Questions (FAQ):

Q: What is included in this order?
A: One 1 in. thick, 4 ft x 4 ft EnergyGuard Grade-II (20 psi) polyiso insulation panel. Bundles ship 48 pieces covering 768 sq ft.

Q: How much area does one panel cover?
A: Each panel covers 16 sq ft; a full 48-piece bundle covers 768 sq ft.

Q: Why choose a 4x4 panel instead of 4x8?
A: The smaller panel is lighter and easier to maneuver, which helps on small roofs, tight staging areas and fill-ins around penetrations.

Q: What is the compressive strength?
A: This panel is ASTM C1289 Type II, Class 1 Grade 2, rated at 20 psi.

Q: Which membrane systems is it compatible with?
A: It is approved for mod bit, BUR and single-ply systems, and works with TPO and PVC in adhered, mechanically attached and induction welded assemblies.

Q: Is a cover board required?
A: For UL Class A over combustible decks, a cover board is required per GAF's listing notes.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

This lightweight 4x4 panel is a practical fill and sump surround piece where a full 4x8 would waste material or be hard to handle. Keep joints tight and staggered when layering with other insulation. Pair with matching 4x8 EnergyGuard panels of the same thickness for the field of the roof to minimize waste.

Install per GAF's instructions and local building code, and use fall protection when working on low-slope roofs.

Order the GAF EnergyGuard 1 in. 4x4 polyiso roof insulation panel for fill-ins and compact roof areas.