If you know the standards — ASTM C1177, D6878, FM 4450 — you know what performance looks like long before the roof goes on. You understand that resilience isn’t luck; it’s engineered into every layer of the roof assembly. DEXcell^® roof boards products are for professionals who live by the spec sheet, not the shortcut.

The hidden layer of strength in low-slope commercial roof systems, roof cover boards are the constant between insulation and membrane that quietly does the heavy lifting. Available in four distinct product options and approved by every major roofing membrane manufacturer, DEXcell roof boards distribute load, absorb impact, resist fire and provide the dimensional stability that separates “acceptable” from fully compliant.

Whether the challenge is wind uplift at the perimeter, impact zones defined by severe weather criteria, or rooftop foot traffic and equipment loads, DEXcell is engineered to perform. Systems incorporating DEXcell roof boards often achieve FM 1-90, 1-120 and higher ratings, satisfying insurers and consultants designing for hurricane or tornado zones.

If you know why the hidden layer matters, we know you. Download the Tech Guide at DEXcellroofboard.com.

National Gypsum Company is the exclusive service provider for products manufactured by Gold Bond Building Products, LLC and PermaBASE Building Products, LLC.

DEXcell® gypsum roof board products are manufactured by Gold Bond Building Products, LLC.

DEXcell® cement roof board products are manufactured by PermaBASE Building Products, LLC