Skip to content
TRI-BUILT ISO Rigid Roof Insulation Board, 4 in. x 4 ft. x 4 ft.
Regular price $45.36Orders start at $399 — combine any items to reach the minimum. Learn more
TRI-BUILT ISO Rigid Roof Insulation Board, 4 in. x 4 ft. x 4 ft.
TRI-BUILT ISO Rigid Roof Insulation in a 4 in. thickness comes in a 4 ft. x 4 ft. panel covering 16 sq ft per piece. This thick polyiso board delivers high thermal value in a single layer for low-slope roof assemblies. Sold by the piece.
Key Features:
- 4 in. polyiso board: Thick 4 in. rigid polyisocyanurate roof insulation.
- 16 sq ft per piece: 4 ft. x 4 ft. panel size covers 16 sq ft.
- Single-layer R-value: A 4 in. board reduces the number of layers needed to reach design R-value.
- Manageable size: Weighs approximately 10.4 lb per piece for easier handling than a full 4x8 sheet.
- Low-slope use: Used in low-slope roofing assemblies beneath the membrane.
- Repair friendly: Compact panel suits patches and small flat-roof sections.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | TRI-BUILT |
| Manufacturer model | TB-317006 |
| Sell unit | 1 panel, 4 in. x 4 ft. x 4 ft. |
| Product line | ISO Rigid Roof Insulation |
| Dimensions | 4 ft. x 4 ft., 4 in. thick |
| Coverage per unit | 16 sq ft per panel |
| Thickness | 4 in. |
| Material | Polyisocyanurate (ISO) rigid foam roof insulation |
| Weight | 10.4 lb per piece |
| Intended use | Rigid thermal insulation for low-slope roofing assemblies |
Coverage & How Much You Need:
One 4 ft. x 4 ft. panel covers 16 sq ft at a single 4 in. layer. Divide the roof area by 16 to size the job, using the same count per layer in multi-layer assemblies.
Fit and Compatibility:
Part of the TRI-BUILT ISO rigid roof insulation family; pair with thinner ISO boards for lower layers or taper systems. Fasteners, plates, adhesives and membrane are sold separately.
Frequently Asked Questions (FAQ):
Q: How much area does one panel cover?
A: Each 4 ft. x 4 ft. panel covers 16 sq ft at a 4 in. thickness.
Q: Why choose a 4 in. board?
A: A thick board reaches high total R-value with fewer layers, reducing labor and joint count in the assembly.
Q: Is the 4x4 size easier to handle?
A: Yes, at about 10.4 lb per piece it is easier to move through roof hatches than a full 4 x 8 sheet.
Q: How is it fastened?
A: Follow the roofing system manufacturer's attachment specification; fasteners and adhesives are sold separately.
Q: What does one order include?
A: One 4 in. x 4 ft. x 4 ft. ISO rigid insulation panel, sold as a single piece.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
A 4 in. polyiso layer is typically used as an upper board over a base layer or where high R-value per layer is required. Verify that the attachment fastener length penetrates the deck properly for the combined thickness. Keep boards flat, dry and out of direct sun exposure before installation.
Keep rigid polyiso insulation away from open flame, heat and sparks, and follow the manufacturer's instructions and local building codes during installation.
Order TRI-BUILT 4 in. ISO rigid roof insulation 4x4 panels for high R-value in fewer layers.
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.
