Johns Manville FESCO Perlite-Based Roof Cover Board, 1.5 in. x 4 ft x 4 ft Panel

The Johns Manville FESCO perlite-based cover board is a 1.5 in. thick, 4 ft x 4 ft board used as a protective cover layer over roof insulation beneath the membrane. Each order unit is one panel covering 16 sq ft. It pairs with JM commercial roofing insulation and single-ply membrane systems.

Key Features:

• Perlite-based core: FESCO is a perlite-based cover board designed to protect roof insulation under the roofing membrane.
• 1.5 in. thickness: This panel is 1.5 in. thick, providing added cover over the insulation layer.
• Code-listed: UL Classified, FM Approved, and Miami-Dade County Approved, meeting ASTM C728, Type 1.
• 16 sq ft per panel: Each 4 ft x 4 ft panel covers 16 square feet of roof area.
• Manageable weight: The panel weighs approximately 23.8 lb for easier handling on the roof.
• JM system component: Designed as an integral component of Johns Manville commercial roof systems.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 4 ft panel covers 16 square feet. Divide total roof area by 16 to estimate panel count, allowing for cut waste around edges and penetrations.

Fit and Compatibility:

FESCO cover board is installed over JM roof insulation beneath JM single-ply or built-up membrane systems. Fasteners and plates or approved adhesives are sold separately; follow the specific JM system assembly.

Frequently Asked Questions (FAQ):

Q: What is included in one order?
A: One 1.5 in. x 4 ft x 4 ft FESCO perlite-based cover board panel, sold per piece.

Q: How many panels do I need?
A: Each panel covers 16 sq ft, so divide your roof area by 16 and add for cuts and waste.

Q: How is it installed?
A: It is set over roof insulation and attached with fasteners/plates or adhesive per the specified JM roof system assembly.

Q: Is it fire rated?
A: It is UL Classified and FM Approved and conforms to ASTM C728, Type 1; use it within a listed JM roof assembly.

Q: Can it be used under any membrane?
A: It is intended for use in compatible Johns Manville roofing systems; confirm the assembly with the project specification.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Perlite cover boards like FESCO are a proven, economical choice for protecting polyiso insulation in low-slope roof systems and are widely accepted in UL and FM assemblies. Stagger board joints and confirm the specified attachment pattern for your wind zone. Choose a thicker board like this 1.5 in. panel when the assembly calls for added cover height or rigidity.

Cover board panels are heavy and brittle at corners; lift with proper technique and keep boards dry and flat until installed.

Order the Johns Manville FESCO 1.5 in. perlite cover board for your next commercial roofing job.

Product Documents:

• Product Data Sheet (PDF)