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Elevate Polyiso Insulation Board 4 ft. x 8 ft. x 1.75 in. Flat Sheet
Regular price $42.34Orders start at $399 — combine any items to reach the minimum. Learn more
Elevate Polyiso Insulation Board 4 ft. x 8 ft. x 1.75 in. Flat Sheet
This is Elevate polyiso insulation board, supplied as a flat 4 ft. x 8 ft. x 1.75 in. sheet. It is installed as roof insulation beneath low-slope membrane roofing. One order unit is one sheet.
Key Features:
- 1.75 in. thickness: The board is 1.75 in. thick for substantial R-value in a single layer.
- Full 4 x 8 sheet: Each sheet measures 4 ft. x 8 ft., covering 32 sq. ft.
- Flat board format: This is a flat, untapered insulation board for general deck coverage.
- Polyiso insulation: Made of polyisocyanurate foam, the standard low-slope roof insulation.
- Elevate system fit: It is part of the Elevate (Holcim) roofing product family.
- Per-sheet unit: One order unit is one sheet.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Elevate (Holcim) |
| Sell unit | 1 sheet, 4 ft. x 8 ft. x 1.75 in. |
| Product line | Elevate Polyiso Insulation Board |
| Material | Polyisocyanurate foam |
| Dimensions | 4 ft. x 8 ft., 1.75 in. thick |
| Thickness | 1.75 in. |
| Length | 8 ft. |
| Width | 4 ft. |
| Coverage per unit | 32 sq. ft. per sheet |
| Intended use | Flat roof insulation under low-slope membrane roofing |
Coverage & How Much You Need:
Each 4 ft. x 8 ft. sheet covers 32 sq. ft. of deck. Divide total roof area by 32 and add a waste allowance for perimeter cuts, penetrations and laps.
Fit and Compatibility:
This flat polyiso board installs beneath low-slope roofing membranes, including Elevate (Holcim) membrane systems sold separately. Tapered variants, cover boards and attachment products are ordered separately.
Frequently Asked Questions (FAQ):
Q: What is included?
A: One sheet of Elevate polyiso insulation board, 4 ft. x 8 ft. x 1.75 in.
Q: How much does one sheet cover?
A: One sheet covers 32 sq. ft. of roof area.
Q: Is this board tapered?
A: No, this is a flat 1.75 in. board; tapered Elevate panels are a separate product line.
Q: What is it made of?
A: Polyisocyanurate foam insulation.
Q: Can I layer it with other boards?
A: Yes, flat polyiso is commonly layered to reach total design thickness; confirm attachment with the membrane system.
Q: Is the membrane included?
A: No, membranes, fasteners and adhesives are sold separately.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A 1.75 in. flat polyiso sheet is a workhorse choice for single- or multi-layer roof insulation builds. Order sheets by total roof area plus waste, stagger joints between layers, and cover promptly with cover board or membrane to protect the foam from moisture and sun.
Use fall protection on low-slope roofs and keep polyiso boards flat, dry and shielded from direct sunlight until covered.
Order Elevate 1.75 in. polyiso insulation by the 4 ft. x 8 ft. sheet for your roof assembly.
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