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Johns Manville DuraBoard High-Density Perlite Roof Cover Board, 0.75 in. x 4 ft x 4 ft
Regular price $22.61Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville DuraBoard High-Density Perlite Roof Cover Board, 0.75 in. x 4 ft x 4 ft
This Johns Manville DuraBoard is a high-density, perlite-based roof cover board, 0.75 in. thick and 4 ft x 4 ft, used as a hard cover layer over roof insulation. Each order unit is one panel covering 16 sq ft. It installs beneath the membrane in JM commercial roof systems.
Key Features:
- High-density core: DuraBoard is a high-density, perlite-based cover board for demanding roof assemblies.
- 0.75 in. thickness: A 0.75 in. thickness balances protection, weight, and build-up height.
- 16 sq ft per panel: Each 4 ft x 4 ft panel covers 16 square feet of roof area.
- Code-listed: UL Classified, FM Approved, and Miami-Dade County Approved to ASTM C728, Type 2.
- Easy handling: The panel weighs about 12 lb, making it easy to carry and place.
- JM system component: Designed as a cover board within Johns Manville commercial roofing systems.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Manufacturer model | 90000659 |
| Sell unit | 1 panel, 0.75 in. x 4 ft x 4 ft |
| Product line | DuraBoard High-Density Perlite Cover Board |
| Material | Perlite-based cover board |
| Dimensions | 4 ft x 4 ft, 0.75 in. thick |
| Thickness | 0.75 in. |
| Coverage per unit | 16 sq ft per panel |
| Weight | 12 lb per panel |
| Approvals | UL Classified; FM Approved; Miami-Dade County Approved; ASTM C728, Type 2 |
| Intended use | Commercial low-slope roofing cover board over insulation |
| Algae resistance | No |
Coverage & How Much You Need:
One 4 ft x 4 ft panel covers 16 square feet. Divide total roof area by 16 and add for cut waste around edges and penetrations.
Fit and Compatibility:
DuraBoard installs over JM roof insulation beneath JM single-ply or bituminous membrane systems. Attachment fasteners and plates or adhesives are specified by the roof assembly and sold separately.
Frequently Asked Questions (FAQ):
Q: What is included in one order?
A: One 0.75 in. x 4 ft x 4 ft DuraBoard high-density perlite cover board panel.
Q: How many panels per square?
A: A roofing square (100 sq ft) needs about 6.25 panels before waste, since each panel covers 16 sq ft.
Q: How is it installed?
A: Set it over insulation and attach with fasteners/plates or adhesive per the specified JM roof system assembly.
Q: Is it FM approved?
A: Yes, it is FM Approved, UL Classified, and Miami-Dade County Approved to ASTM C728, Type 2.
Q: How does it differ from standard perlite board?
A: DuraBoard is the high-density version of JM's perlite cover board line for assemblies requiring greater density.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
High-density perlite boards like DuraBoard resist foot traffic and job-site damage better than standard perlite while staying affordable versus gypsum cover boards. Use the 0.75 in. thickness where the assembly calls for added cover height or where specified for wind uplift. Keep boards dry and store flat on the deck until attached.
Cover board panels are heavy and brittle at edges; lift properly and wear gloves to avoid cut edges during handling.
Order the Johns Manville DuraBoard 0.75 in. high-density perlite cover board for your roofing assembly.
Product Documents:
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