Elevate ISO 95+ GL Grade-II Polyiso Roof Insulation Board, 3.75 in. x 4 ft. x 8 ft.

This Elevate ISO 95+ GL Grade-II polyiso roof insulation board is a 3.75 in. thick, 4 ft. x 8 ft. flat panel with a closed-cell polyiso foam core laminated to glass-reinforced mat facers. Sold as one piece, it delivers high R-value per inch for commercial low-slope roofing and pairs with Elevate membrane systems and cover boards.

Key Features:

• High R-value: Polyisocyanurate foam delivers the highest R-value per inch of common insulation systems.
• Grade-II 20 psi: Grade-II (20 psi) polyiso board for use beneath approved roofing membranes.
• Glass mat facers: Closed-cell polyiso core is laminated to a glass-reinforced mat facer on both major surfaces.
• Broad approvals: FM Approved, UL Classified, Miami-Dade County Approved and PIMA Quality Mark certified.
• Standards listed: Meets ASTM C1289, Type II, Class 1 and CAN/ULC-S704, Type 1, Class 3.
• LEED friendly: LEED-compatible product manufactured in an ISO 9001 registered facility.
• Full sheet size: Large 4 ft. x 8 ft. sheet covers 32 sq ft per board for faster installation.

Specifications Table:

Coverage & How Much You Need:

Each 4 ft. x 8 ft. board covers 32 sq ft of roof area. Divide total roof square footage by 32 to estimate board count, and plan layout per the membrane manufacturer’s instructions.

Fit and Compatibility:

Designed for use under Elevate single-ply and modified bitumen membrane systems on commercial low-slope roofs. Tapered ISOGARD GL boards and cover boards are available separately for drainage and protection.

Frequently Asked Questions (FAQ):

Q: What is included with my order?
A: One 3.75 in. x 4 ft. x 8 ft. Grade-II (20 psi) polyiso insulation board, sold per piece.

Q: How many boards do I need?
A: Each board covers 32 sq ft, so divide your roof area by 32 and add for layout waste and perimeter conditions.

Q: Is this board suitable under single-ply membranes?
A: Yes, it is a flat polyiso insulation board made for commercial low-slope roofing applications; install per the roofing system manufacturer’s instructions.

Q: What facers does the board have?
A: A glass-reinforced mat facer is laminated to both major surfaces of the closed-cell polyiso core.

Q: Is the blowing agent ozone-safe?
A: Yes, ISOGARD GL uses an HCFC-free, EPA-accepted blowing agent that does not deplete the ozone layer.

Q: Which certifications apply?
A: The board is FM Approved, UL Classified, Miami-Dade County Approved, CCMC listed and carries the PIMA Quality Mark.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Polyiso gives the highest R-value per inch of common insulation options, so this 3.75 in. board is an efficient choice when targeting R-value in a thin assembly. Verify board thickness and attachment against the membrane system’s FM or UL listing, and use layers to stagger joints. Pair with an approved cover board before adhering single-ply membrane.

Handle large 4 ft. x 8 ft. boards with care on windy rooftops and follow fall-protection and fire-safety requirements during installation.

Order the Elevate ISO 95+ GL 3.75 in. polyiso insulation board today to build R-value into your low-slope roof assembly.