Elevate ISO 95+ GL Grade-II (20 psi) Polyiso Roof Insulation Board, 1.75 in. x 4 ft. x 4 ft.

This Elevate ISO 95+ GL Grade-II polyisocyanurate roof insulation board measures 1.75 in. thick, 4 ft. x 4 ft., and is rated 20 psi compressive strength (Grade-II). Each board is a closed-cell polyiso foam core laminated to glass-reinforced mat facers on both faces. Sold per piece; order 9 boards per square (100 sq ft).

Key Features:

• High R-value per inch: Polyiso delivers among the highest thermal resistance per inch of common rigid insulation systems.
• Glass-reinforced facers: A closed-cell polyiso foam core is laminated to a glass reinforced mat facer on both major surfaces.
• Grade-II 20 psi: Grade-II compressive strength rated at 20 psi for commercial low-slope roof assemblies.
• Stable thermal performance: ISOGARD polyiso meets both ASTM C1289 required and recommended thermal performance values.
• Odor-free blowing agent: Uses an HCFC-free, EPA accepted blowing agent that does not contribute to ozone depletion (ODP-free).
• Widely certified: ASTM C1289 Type II Class 1, FM Approved, UL Classified, and Miami-Dade County Approved.
• LEED-supporting: Product listing references LEED, supporting green building documentation.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 4 ft board covers 16 sq ft of roof deck. For a full roofing square (100 sq ft), plan on 9 boards (144 sq ft) with minor field cutting and joint allowances; add tapered and cover board pieces per the project layout.

Fit and Compatibility:

Designed for use in Elevate low-slope commercial roof systems under single-ply and other approved membranes, installed per Elevate specifications. Thickness upgrades, other sizes, tapered variants, and attachment adhesives or fasteners are sold separately.

Frequently Asked Questions (FAQ):

Q: How many boards do I need for one roofing square?
A: Each board covers 16 sq ft, so 9 boards provide 144 sq ft, enough for one square (100 sq ft) with layout cuts and joint allowance.

Q: How is this board attached?
A: Follow Elevate project specifications; polyiso of this type is commonly attached with approved adhesives or mechanical fasteners, and this facer is designed for good adhesion.

Q: What compressive strength does Grade-II mean?
A: Grade-II polyiso is rated 20 psi compressive strength per the ASTM C1289 Type II classification.

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

Q: Is it rated for high-wind coastal areas?
A: The product is Miami-Dade County Approved and FM Approved; confirm the specific project assembly is FM or Miami-Dade approved as designed.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Choose 1.75 in. Grade-II when the spec calls for roughly R-9 to R-10 per board in the base layer of a two-layer polyiso build-up. Stagger joints between layers and keep boards flat and tight to the deck to limit heat loss and membrane telegraphing. Use elevators or protective layers as required by the membrane system and verify attachment density against the wind-uplift design.

Handle with care around eye level and wear gloves, eye protection and a dust mask when cutting polyiso boards on site.

Order the Elevate ISO 95+ GL 1.75 in. polyiso roof insulation board for your next commercial low-slope roofing project.