Skip to content
Elevate ISO 95+ GL Grade-II (20 psi) Polyiso Roof Insulation Board, 2.5 in. x 4 ft x 8 ft
Regular price $40.50Orders start at $399 — combine any items to reach the minimum. Learn more
Elevate ISO 95+ GL Grade-II (20 psi) Polyiso Roof Insulation Board, 2.5 in. x 4 ft x 8 ft
This Elevate ISO 95+ GL Grade-II polyiso roof insulation board is a 2.5 in. thick, 4 ft x 8 ft flat panel with a closed-cell polyisocyanurate foam core laminated to a glass-reinforced mat facer on both surfaces. One piece is the sell unit. Pair it with Elevate membrane, adhesives and fasteners as part of a complete commercial roofing assembly.
Key Features:
- High thermal value: Polyisocyanurate foam delivers among the highest R-value per inch of common insulation systems.
- GL glass facer: A glass-reinforced mat facer is laminated to both major surfaces of the closed-cell foam core.
- Grade-II 20 psi: Grade-II compressive strength rating (20 psi) suits commercial low-slope roofing assemblies.
- Meets ASTM C1289: Manufactured to ASTM C1289, Type II, Class 1, meeting both required and recommended thermal performance values.
- ODP-free blowing agent: Uses an HCFC-free blowing agent that does not contribute to ozone depletion.
- Code approvals: FM Approved, Miami-Dade County Approved, UL Classified, CCMC 13274-L and PIMA Quality Mark listed.
- LEED contribution: Listed as LEED-relevant and produced in an ISO 9001 registered facility.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Elevate |
| Manufacturer model | W841112508 |
| Sell unit | 1 board, 4 ft x 8 ft x 2.5 in. |
| Product line | ISO 95+ GL (ISOGARD GL) |
| Profile / style | Flat board |
| Color | Gray |
| Dimensions | 4 ft x 8 ft x 2.5 in. thick |
| Thickness | 2.5 in. |
| Material | Polyisocyanurate foam core with glass-reinforced mat facer (both faces) |
| Compressive strength | Grade-II (20 psi) |
| Coverage per unit | 32 sq ft per board |
| Weight | 16.1 lb per piece |
| Applicable standards | ASTM C1289 Type II, Class 1; CAN/ULC-S704 Type 1, Class 3; CCMC 13274-L; FM Approved; UL Classified; Miami-Dade County Approved; PIMA Quality Mark; LEED; ISO 9001 registered facility |
| Intended use | Thermal insulation for commercial low-slope roofing assemblies |
| Blowing agent | HCFC-free, ODP-free |
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 check the specified system assembly for the required total insulation thickness.
Fit and Compatibility:
Designed for use in Elevate commercial low-slope roofing systems; install per Elevate specifications with compatible membranes, adhesives and fasteners (sold separately). Confirm board thickness and layering against the project specification.
Frequently Asked Questions (FAQ):
Q: What is included with my order?
A: One 2.5 in. thick, 4 ft x 8 ft flat polyiso insulation board.
Q: How many boards do I need?
A: Each board covers 32 sq ft; divide your roof area by 32 and confirm the total thickness your roofing specification requires.
Q: What compressive strength does this board have?
A: It is a Grade-II board rated at 20 psi.
Q: Which standards does it meet?
A: It meets ASTM C1289 Type II, Class 1 and CAN/ULC-S704 Type 1, Class 3, and is FM Approved, UL Classified and Miami-Dade County Approved (CCMC 13274-L).
Q: Can it be used under any membrane?
A: It is intended for low-slope commercial roofing assemblies; follow the membrane manufacturer's system specification for acceptable board and attachment methods.
Q: How much does one board weigh?
A: A single 2.5 in. board weighs approximately 16.1 lb.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Flat GL polyiso is the standard insulation layer in low-slope assemblies; consider stacking two thinner layers with staggered joints instead of a single thick layer to improve flatness for membrane installation. Match thickness to the project R-value target and confirm deck type, attachment method and wind-uplift requirements before ordering fasteners or adhesives. Tapered Elevate ISOGARD GL boards can be used where positive drainage is required.
Handle large rigid boards carefully on the roof and follow manufacturer instructions and local building code for attachment and wind-uplift requirements.
Order the Elevate ISO 95+ GL Grade-II 2.5 in. polyiso insulation board for your commercial roofing project today.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
