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Johns Manville SECUROCK Glass-Mat Roof Board 1/4 in. x 4 ft. x 8 ft.
Regular price $28.50Orders start at $399 — combine any items to reach the minimum. Learn more
Johns Manville SECUROCK Glass-Mat Roof Board 1/4 in. x 4 ft. x 8 ft.
JM SECUROCK Glass-Mat is a 1/4 in. thick, 4 ft. x 8 ft. gypsum cover board sheet sold per piece. It is used in commercial roofing as a gypsum board for cover board and substrate applications. Pair it with insulation and membrane layers per the roofing system specification.
Key Features:
- Glass-mat faced: Glass-mat faced gypsum board designed for commercial roofing use.
- Quarter-inch profile: 1/4 in. thickness suits cover board and substrate layers in roof assemblies.
- Full sheet format: Supplied in 4 ft. x 8 ft. sheets for efficient layout on the roof.
- Cover board use: Listed under commercial roofing cover boards (gypsum board) category.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Johns Manville |
| Sell unit | 1 piece, 1/4 in. x 4 ft. x 8 ft. |
| Product line | SECUROCK |
| Available sizes | 1/4 in. x 4 ft. x 8 ft. |
| Material | Glass-mat gypsum board |
| Dimensions | 1/4 in. x 4 ft. x 8 ft. |
| Thickness | 1/4 in. |
| Width | 4 ft. |
| Length | 8 ft. |
| Intended use | Commercial roofing cover board / gypsum board |
Coverage & How Much You Need:
Each 4 ft. x 8 ft. sheet covers 32 sq ft of roof area before lap or joint allowances; divide total roof area by 32 sq ft per sheet and add waste.
Fit and Compatibility:
Used within commercial roofing assemblies as a cover board over insulation and beneath the membrane; insulation, membrane and fasteners are sold separately.
Frequently Asked Questions (FAQ):
Q: What is included in one sell unit?
A: One 1/4 in. x 4 ft. x 8 ft. SECUROCK Glass-Mat sheet.
Q: What is it used for?
A: It is a gypsum cover board used in commercial roofing assemblies.
Q: How much area does a sheet cover?
A: A 4 ft. x 8 ft. sheet covers 32 square feet before cuts and waste.
Q: How is it attached?
A: Follow the roofing system specification; cover boards are typically adhered or mechanically fastened with compatible fasteners.
Q: What thickness is it?
A: This item is 1/4 in. thick.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Thin glass-mat gypsum like this 1/4 in. SECUROCK sheet is commonly used where a light separator or substrate layer is needed rather than a heavy-duty cover board. Keep sheets tight to adjacent boards and stagger joints, and store them flat and dry until installation. Confirm the specified board thickness and attachment pattern with the membrane manufacturer before substituting.
Handle gypsum boards with care and use proper lifting technique; cut edges and dust require gloves, eye protection and a dust mask.
Order JM SECUROCK Glass-Mat 1/4 in. roof board for your commercial roof assembly.
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