Skip to content
Carlisle InsulBase HD High-Density Polyiso Cover Board 0.5 in. x 4 ft x 8 ft
Regular price $28.25Orders start at $399 — combine any items to reach the minimum. Learn more
Carlisle InsulBase HD High-Density Polyiso Cover Board 0.5 in. x 4 ft x 8 ft
Carlisle InsulBase HD is a rigid roof insulation cover board with a high-density closed-cell polyisocyanurate foam core bonded on each side to glass-reinforced felt. This listing is one 0.5 in. x 4 ft x 8 ft tan board delivering R-2.5 and 80 psi compressive strength for single-ply roofing systems.
Key Features:
- High-density core: Closed-cell polyisocyanurate foam core bonded on each side to glass-reinforced felt (GRF).
- 80 psi strength: Delivers 80 psi compressive strength.
- Impact protection: Provides exceptional protection against hail and rooftop traffic.
- Better R-value: Higher R-value than wood fiber and gypsum cover boards, at 2.5 per board.
- Two applications: Suitable for both re-roofing and new construction.
- Eco-friendly build: 0% ozone-depleting components and CFC free.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Carlisle |
| Sell unit | 1 board, 0.5 in. x 4 ft x 8 ft |
| Product line | Carlisle InsulBase HD high-density ISO cover board |
| Available sizes | 0.5 in. x 4 ft x 8 ft |
| Dimensions | 0.5 in. thick, 4 ft x 8 ft sheet |
| Material | High-density closed-cell polyisocyanurate foam with glass-reinforced felt facers |
| Finish / texture | Tan |
| Coverage per unit | 32 sq ft per 4 ft x 8 ft board before laps and waste |
| Wind / fire / impact rating | Exceptional protection against hail and rooftop traffic |
| R-value | 2.5 |
| Compressive strength | 80 psi |
| Intended use | Cover board in mechanically-attached and induction-welded single-ply roofing systems only |
Coverage & How Much You Need:
Each 4 ft x 8 ft board covers 32 sq ft of roof deck before lap, cut and waste allowances. Measure the roof area, divide by 32 sq ft, and add waste for cut boards at edges and penetrations.
Fit and Compatibility:
Designed for use as a cover board in mechanically-attached and induction-welded single-ply roofing systems only, in both re-roofing and new construction. Not intended for other attachment methods; pair with the membrane system's approved adhesives or fasteners.
Frequently Asked Questions (FAQ):
Q: What is included in the sell unit?
A: One 0.5 in. x 4 ft x 8 ft tan InsulBase HD cover board.
Q: How much area does one board cover?
A: A 4 ft x 8 ft board covers 32 sq ft before laps and waste.
Q: What R-value does it provide?
A: InsulBase HD delivers an R-value of 2.5, higher than wood fiber and gypsum cover boards.
Q: How strong is it?
A: It provides 80 psi compressive strength with exceptional protection against hail and rooftop traffic.
Q: Can it be used on any single-ply system?
A: It is designed for mechanically-attached and induction-welded single-ply systems only.
Q: Is it environmentally friendly?
A: Yes, it contains 0% ozone-depleting components and is CFC free.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
InsulBase HD is the cover board to specify where rooftop traffic or hail exposure is a concern and where you want the R-value boost polyiso gives over gypsum or wood fiber. Keep boards dry before installation, butt joints tightly, and follow the membrane manufacturer's attachment requirements for mechanically-fastened systems. Confirm system approval before substituting it under adhered membranes.
Wear gloves and dust protection when cutting polyiso boards, and keep board edges clear when handling to avoid skin abrasions.
Order Carlisle InsulBase HD cover board for durable, high-R-value protection on your next single-ply roof.
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.
