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Johns Manville DuraBoard 1 in. x 4 ft. x 4 ft. High-Density Perlite Roof Cover Board
Regular price $23.80Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville DuraBoard 1 in. x 4 ft. x 4 ft. High-Density Perlite Roof Cover Board
Johns Manville DuraBoard is a 1 in. thick, 4 ft. x 4 ft. high-density perlite-based roof cover board made from expanded perlite and reinforcing cellulosic fibers. One piece covers 16 sq ft and is sold per piece. It is used under multi-ply and single-ply membranes and accepts direct SBS or APP torch application thanks to its polymerized asphalt emulsion coating.
Key Features:
- Perlite core stability: Expanded perlite provides good dimensional stability, excellent insulation value with a stable R-value and fire resistance.
- Torch-ready coating: Polymerized asphalt emulsion coating allows direct SBS or APP membrane torch application without pre-heating the board.
- High-density strength: High-density construction provides additional strength and durability on the roof.
- High recycled content: Reinforcing cellulosic fibers consist of recycled newsprint, with recycled content certified by UL Environment for LEED contribution.
- Standard 4x4 panel: 4 ft. x 4 ft. panel at 1 in. thickness covers 16 sq ft per board.
- Code-listed board: Meets ASTM C728, Type 2; UL Classified, FM Approved and Miami-Dade County Approved.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Manufacturer model | 90000660 |
| Sell unit | 1 board, 1 in. x 4 ft. x 4 ft. |
| Product line | DuraBoard High-Density Perlite-Based Cover Board |
| Dimensions | 4 ft. x 4 ft., 1 in. thick |
| Coverage per unit | 16 sq ft per board |
| Material | Expanded perlite with reinforcing cellulosic fibers (recycled newsprint) |
| Finish / texture | Polymerized asphalt emulsion coating |
| Intended use | Roof cover board for multi-ply and single-ply roofing systems |
| Standard | ASTM C728, Type 2 |
| Approvals | UL Classified; FM Approved; Miami-Dade County Approved; ASTM C728, Type 2 |
| Coating benefit | Allows direct torch application of SBS or APP membranes without pre-heating |
| Recycled content | Third-party certified by UL Environment; contributes to LEED Materials credits |
| Weight | 16 lb per board |
| Assembly | Installed as a cover board layer; attach per JM system specification with compatible fasteners, plates or adhesives |
Coverage & How Much You Need:
One 4 ft. x 4 ft. board covers 16 sq ft, so a 100 sq ft square needs about 7 boards; order roughly 6-10% extra to allow for cuts and fit-up around penetrations. Boards are butted together with joints staggered per the roof system specification.
Fit and Compatibility:
DuraBoard is used in JM multi-ply systems and can be installed a number of ways, including under SBS or APP torch-applied membranes directly on its polymerized coating. Single-ply attachment fasteners and plates, or approved adhesives, are sold separately; follow the JM system specification for the compatible attachment method.
Frequently Asked Questions (FAQ):
Q: How much does one board cover?
A: Each 4 ft. x 4 ft. board covers 16 sq ft; a roofing square (100 sq ft) needs about 7 boards plus waste allowance.
Q: What is the board made of?
A: It is a high-density perlite-based board of expanded perlite and reinforcing recycled cellulosic fibers with a polymerized asphalt emulsion coating.
Q: Can I torch a membrane directly to it?
A: Yes, the polymerized asphalt emulsion coating allows direct SBS or APP torch application without pre-heating, saving fuel and labor.
Q: Does it meet standards?
A: It meets ASTM C728, Type 2, and is UL Classified, FM Approved and Miami-Dade County Approved.
Q: How is it attached?
A: Installation method varies by system; it can be set in adhesive or mechanically attached with compatible fasteners and plates per the JM specification.
Q: How heavy is one board?
A: One 1 in. x 4 ft. x 4 ft. board weighs approximately 16 lb.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
DuraBoard is a good choice where you need a fire-resistant, dimensionally stable cover board over polyiso or as a substrate in multi-ply assemblies, and its torch-ready coating eliminates the pre-heating step required with heavily coated boards. Lay boards with joints butted and staggered from insulation joints, and attach with fastener patterns or adhesives called out in the JM system spec. For jobs needing higher compressive resistance or different thicknesses, confirm the specified DuraBoard thickness before ordering.
Torch application and board handling require gloves, eye protection and fire-watch precautions; follow the membrane manufacturer's installation instructions and local code requirements.
Order Johns Manville DuraBoard 1 in. x 4 ft. x 4 ft. cover board for a stable, torch-ready roof substrate.
Product Documents:
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