GAF EnergyGuard 3.3 in. 4 ft x 8 ft Grade-II (20 psi) Polyiso Roof Insulation Panel

This is a GAF EnergyGuard 3.3 in. thick polyisocyanurate roof insulation panel measuring 4 ft x 8 ft, rated Grade-II (20 psi) under ASTM C1289 Type II. Each panel is a sell unit sold by the piece; a bundle contains 14 panels covering 448 sq ft. It pairs with GAF-approved low-slope roof systems including single-ply, mod bit and BUR assemblies.

Key Features:

• High thermal value: A 3.3 in. polyiso core bonded to glass fiber reinforced cellulosic felt (GRF) facers delivers high thermal efficiency per panel.
• 20 psi compressive strength: Grade-II rating per ASTM C1289 Type II, Class 1 provides 20 psi compressive strength for commercial low-slope roofing.
• Fewer seams per square: The 4 ft x 8 ft format covers 32 sq ft per panel, reducing joints and installation labor versus smaller boards.
• Wide system compatibility: Approved for use with modified bitumen, BUR and single-ply systems, including TPO and PVC in adhered, mechanically attached and induction welded applications.
• Broad approvals: FM Approved, UL Classified, Miami-Dade County Approved and Florida Building Code Approved.
• Easy field cutting: Lightweight panels are easy to cut in the field, making handling and installation more efficient.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 8 ft panel covers 32 sq ft; a full bundle of 14 panels covers 448 sq ft. Divide the roof area by 32 sq ft per panel to estimate panel count.

Fit and Compatibility:

Approved for modified bitumen, BUR and single-ply roof systems, including TPO and PVC in adhered, mechanically attached and induction welded systems. Membrane, adhesive and fastening components are sold separately; install per GAF specification.

Frequently Asked Questions (FAQ):

Q: What is included in one order?
A: One 4 ft x 8 ft, 3.3 in. thick polyiso insulation panel; panels ship 14 per bundle.

Q: How many panels do I need?
A: Each panel covers 32 sq ft, so divide your roof area by 32 to estimate the panel count and allow for cuts.

Q: What strength is this panel?
A: It is Grade-II per ASTM C1289 Type II, Class 1, rated at 20 psi compressive strength.

Q: Can it be used under TPO or PVC membranes?
A: Yes, GAF lists compatibility with TPO and PVC in adhered, mechanically attached and induction welded single-ply systems, plus mod bit and BUR.

Q: Is it approved in my region?
A: It is FM Approved, UL Classified, Florida Building Code Approved and Miami-Dade County Approved; always confirm with local code requirements.

Q: How heavy are the panels?
A: Each 3.3 in. 4×8 panel weighs about 20.3 lb; plan for two-person handling.

Expert Verdict Reviewed by the SuperArbor Pro Desk

The 3.3 in. thickness packs more R-value into each 4×8 board, reducing the number of layers needed to meet energy code on low-slope roofs. Keep panels flat and dry before install, stagger joints between layers, and verify fastener length reaches the deck. Pair with a GAF-approved cover board where UL Class A over combustible decks is required.

Handle and cut panels with gloves and eye protection, and follow the manufacturer’s installation instructions and local building code for attachment and fire-assembly requirements.

Order GAF EnergyGuard 3.3 in. 4×8 polyiso roof insulation today for high R-value with fewer seams.