GAF EnergyGuard 1/2 in. x 4 ft x 8 ft Grade II (20 psi) Polyiso Roof Insulation Panel

This is a GAF EnergyGuard 1/2 in. thick, 4 ft x 8 ft Grade II (20 psi) polyisocyanurate roof insulation panel with glass fiber reinforced cellulosic felt (GRF) facers. One panel is the sell unit, sold per piece. Use it as part of a tapered EnergyGuard system to add slope and drive water to drains on low-slope commercial roofs.

Key Features:

• High thermal value: Polyisocyanurate foam core bonded to glass fiber reinforced cellulosic felt facers provides high thermal efficiency for low-slope roof systems.
• Tapered system ready: Designed for use in GAF EnergyGuard tapered systems that help eliminate ponding water and prolong roof life.
• Single-ply compatible: Compatible with TPO and PVC membranes in adhered, mechanically attached and induction welded systems, and approved for mod bit and BUR systems.
• Lightweight handling: Panels are lightweight and easy to cut in the field, making installation more efficient.
• Code approvals: FM Approved (4450/4470), UL 1256/790/263 classified, Miami-Dade County approved and State of Florida approved.
• Recycled content: Green Circle Certified for recycled content and contributes to green building rating systems.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 8 ft panel covers 32 sq ft of roof area. Calculate total square footage and slope layout (crickets, sumps, per-foot slopes) to size a tapered system; GAF offers tapered design assistance.

Fit and Compatibility:

Works in GAF EnergyGuard tapered systems with mod bit, BUR, and TPO or PVC single-ply membranes in adhered, mechanically attached or induction welded applications. Compatible GAF plates, fasteners, adhesives and membranes are sold separately; a cover board is required for UL Class A over combustible decks.

Frequently Asked Questions (FAQ):

Q: What is included with this order?
A: One 1/2 in. x 4 ft x 8 ft Grade II (20 psi) EnergyGuard polyiso insulation panel, sold per piece.

Q: How much area does one panel cover?
A: Each 4 ft x 8 ft panel covers 32 square feet before accounting for slope design and cutting waste.

Q: Can this be used with single-ply membranes?
A: Yes, it is approved for mod bit, BUR and single-ply systems, and is compatible with TPO and PVC in adhered, mechanically attached and induction welded systems.

Q: Does this panel provide slope?
A: This item is a 1/2 in. panel; EnergyGuard tapered panels are available in slopes from 1/16 in. to 1/2 in. per foot and can be combined into tapered systems and crickets that drive water to drains.

Q: What fasteners should I use?
A: Install per the GAF specification with compatible insulation fasteners and plates, following the membrane manufacturer's installation instructions and local code.

Q: Is a cover board required?
A: For UL Class A over combustible decks, a cover board is required; see UL iQ for assembly details.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Choose 20 psi Grade II polyiso for standard commercial low-slope assemblies where cost and thermal value are the priority; step up to 25 psi Grade III where higher fastener pull-out loads demand it. For ponding-prone roofs, lay out crickets and sumps using tapered EnergyGuard panels rather than flat stock, and take advantage of GAF's pre-sorted, pre-labeled tapered shipments on larger jobs. Install over an approved deck per the GAF specification with compatible plates and fasteners, and verify wind-uplift requirements with a fastener pull test.

Handle and cut panels with care on the roof and follow OSHA fall-protection requirements during commercial roofing installation.

Add GAF EnergyGuard 1/2 in. polyiso roof insulation panels to your low-slope roofing estimate today.