TRI-BUILT 2 in. x 4 ft. x 8 ft. ISO II GRF Polyiso Roof Insulation Board

This TRI-BUILT ISO II GRF roof insulation board is a 2-inch-thick, 4 ft. x 8 ft. polyisocyanurate panel for use in low-slope commercial roof assemblies. One board covers 32 sq ft and is sold per piece, with boards counted by the square for larger jobs.

Key Features:

• 2 in. thickness: Two-inch panel provides substantial thermal value in the roof assembly.
• 4 ft. x 8 ft. board: Standard 32 sq ft board size for efficient layout and coverage.
• GRF facer: Glass-reinforced facer (GRF) construction in the ISO II line.
• Polyiso core: Polyisocyanurate foam insulation for low-slope roofing systems.
• Lightweight handling: Approximately 12.16 lb per 2-inch board for easy job-site handling.

Specifications Table:

Coverage & How Much You Need:

Each 2 in. x 4 ft. x 8 ft. board covers 32 sq ft. Divide total roof area by 32 and add waste for cuts and taper allowance to size the order; boards are also counted by the square (100 sq ft).

Fit and Compatibility:

Used within low-slope roof assemblies beneath approved membranes and cover boards. Install per the membrane manufacturer’s requirements; fastening plates and adhesives are sold separately.

Frequently Asked Questions (FAQ):

Q: What size is each board?
A: Each board is 4 ft. x 8 ft. and 2 inches thick, covering 32 sq ft.

Q: How many boards do I need?
A: Divide the roof area by 32 sq ft per board and allow for cuts and waste.

Q: What is GRF?
A: GRF refers to the glass-reinforced facer on this ISO II insulation board.

Q: How much does a board weigh?
A: Approximately 12.16 lb per 2-inch board.

Q: Is it sold by the piece or square?
A: It can be ordered per piece and is counted by the square for larger quantities.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Polyiso is the standard thermal layer in low-slope commercial assemblies; verify the project’s required R-value and use multiple thinner layers in staggered joints to reduce thermal bridging. Check with the membrane manufacturer for approved attachment methods and board placement relative to cover boards. Confirm long-term thermal resistance values with the manufacturer for code compliance.

Handle boards carefully on windy rooftops and store flat and dry until installation.

Order the TRI-BUILT 2 in. ISO II GRF polyiso roof insulation board for your low-slope roof assembly.