Johns Manville FESCO 2 in. x 4 ft. x 4 ft. Perlite Roof Cover Board, Sold per Piece

This is a single 2 in. thick, 4 ft x 4 ft Johns Manville FESCO perlite-based roof cover board, sold per piece at 16 sq ft of coverage per board. FESCO gives a rigid, code-listed substrate under low-slope single-ply and other roofing membranes. It meets ASTM C728 Type 1 and is UL Classified, FM Approved and Miami-Dade County Approved.

Key Features:

• Perlite cover board: Rigid perlite-based cover board per ASTM C728, Type 1.
• 16 sq ft per board: Each 4 ft x 4 ft board covers 16 sq ft.
• 2 in. thickness: Board measures 2 in. thick.
• Code-listed: UL Classified, FM Approved and Miami-Dade County Approved.
• Sold per piece: Order exact piece counts for small jobs and repairs.

Specifications Table:

Coverage & How Much You Need:

One 4 ft x 4 ft board covers 16 sq ft; divide the roof area by 16 sq ft per board and add a cutting allowance.

Fit and Compatibility:

Installed under Johns Manville single-ply and other low-slope roofing systems as a cover board layer per the specified system. Attachment adhesive and fasteners are sold separately.

Frequently Asked Questions (FAQ):

Q: What is included?
A: One 4 ft x 4 ft board, 2 in. thick, covering 16 sq ft.

Q: How many boards do I need?
A: Divide the roof area by 16 sq ft per board and add allowance for cuts and perimeter fitting.

Q: Why choose the 4 ft x 4 ft size?
A: Smaller panels are easier to hand-carry onto the roof and waste less material on small jobs.

Q: Is it code approved?
A: Yes: UL Classified, FM Approved, Miami-Dade County Approved, meeting ASTM C728 Type 1.

Q: How is it installed?
A: Per the specified membrane system, with compatible adhesive or fasteners sold separately.

Expert Verdict Reviewed by the SuperArbor Pro Desk

The 2 in. thickness adds meaningful height and stiffness where the system calls for a thick cover board layer. Because a 2 in. 4×4 board weighs over 30 lb, plan for two-person handling on ladders and roof loading. Stagger joints between boards for a stable membrane substrate.

Wear gloves when handling cut board edges and lift heavy panels with proper technique or two people.

Order the Johns Manville FESCO 2 in. x 4 ft x 4 ft perlite cover board by the piece today.

Product Documents:

• Product Data Sheet (PDF)