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Johns Manville Perlite FESCO Flat Insulation Board, ASTM C 728 Type 1
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Johns Manville Perlite FESCO Flat Insulation Board, ASTM C 728 Type 1
JM Perlite FESCO Flat Insulation Board is a protective perlite-based cover board and low-thermal insulation board proven to reduce blistering in hot-asphalt roofing applications. It meets ASTM C 728, Type 1 and ships as individual boards in three sizes. Use it under JM roofing membranes or as low-thermal insulation on compatible substrates.
Key Features:
- Hot asphalt friendly: Proven to reduce the tendency for blistering in hot-asphalt applied roofing systems.
- TopLoc coating: Top surface is sealed with a special coating to reduce excessive asphalt absorption.
- Dimensional stability: Expanded perlite provides good dimensional stability and stable R-value.
- Fire resistant: Expanded perlite composition offers inherent fire resistance.
- High recycled content: Reinforcing cellulosic fibers made of recycled newsprint, third-party certified by UL Environment for LEED contributions.
- Meets ASTM C 728: Conforms to the requirements of ASTM C 728, Type 1.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 board |
| Product line | JM Perlite FESCO Flat Insulation Board |
| Available sizes | ['1.5 in. x 2 ft x 4 ft', '2 in. x 2 ft x 4 ft', '1 in. x 4 ft x 4 ft'] |
| Available colors | ['Brown'] |
| Material | Expanded perlite, reinforcing cellulosic fibers and selected binders |
| Approvals | Meets ASTM C 728, Type 1; recycled content certified by UL Environment |
| Finish / texture | TopLoc coating on top surface |
| Dimensions | Available in 1.5 in. x 2 ft x 4 ft, 2 in. x 2 ft x 4 ft and 1 in. x 4 ft x 4 ft |
| Intended use | Protective cover board or low-thermal insulation board for commercial roofing |
| Recycled content | Cellulosic fibers from recycled newsprint; UL Environment third-party certified |
Coverage & How Much You Need:
Each board covers 8 sq ft (2 ft x 4 ft) or 16 sq ft (4 ft x 4 ft); divide the roof area by the board footprint and allow for cuts and fit around penetrations.
Fit and Compatibility:
Intended for use in JM roofing systems as a cover board under membranes or as low-thermal insulation. Attach per the system specification, typically in hot asphalt or with an approved insulation adhesive.
Frequently Asked Questions (FAQ):
Q: What sizes are available?
A: The line includes 1.5 in. x 2 ft x 4 ft, 2 in. x 2 ft x 4 ft and 1 in. x 4 ft x 4 ft boards, all in brown.
Q: What is a FESCO board used for?
A: It serves as a protective cover board or low-thermal insulation board in commercial roofing assemblies.
Q: Why does it resist blistering?
A: The perlite composition and TopLoc-coated top surface reduce excessive asphalt absorption in hot-asphalt applications.
Q: Does it contribute to LEED?
A: Yes, its recycled newsprint content is third-party certified by UL Environment and contributes to LEED Materials.
Q: Is it fire resistant?
A: Expanded perlite provides fire resistance as stated by the manufacturer.
Q: How is it installed?
A: Install per the roofing system specification, typically adhered in hot asphalt or with an approved insulation adhesive.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Perlite cover boards are a cost-effective choice when a hot-asphalt-applied system needs a blister-resistant substrate, and the TopLoc coating further limits asphalt absorption. Choose the 1.5 in. or 2 in. boards when additional thermal value or a heavier cover board is specified, and the 1 in. x 4 ft x 4 ft board for faster coverage on open decks. Always confirm the board thickness and attachment method against the project's specified roof assembly.
Handle boards carefully to avoid breakage, and follow hot kettle and asphalt safety practices during installation.
Order JM Perlite FESCO Flat Insulation Board for a blister-resistant cover board on your hot-asphalt roofing project.
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