Div 09 · Finishes
Securock Brand UltraLight Glass-Mat Sheathing Firecode X
U
USG · Securock UltraLight Glass-Mat Sheathing Firecode X (UL Type USGX)
A 5/8 in. Type X glass-mat faced gypsum sheathing panel made to ASTM C1177 for exterior wall substrates in rated construction.
✓ Verified 2026-08-28
Specs on this page were checked against USG product page on 2026-08-28.
Specifications
| Thickness | 5/8 in (15.9 mm) |
Certifications & Standards
ASTM C1177
ASTM D3273 mold resistance test method
UL Fire Resistance Classification UL Type USGX
Attributes — product claims, not third-party certifications
Type XGlass-mat facedMold resistant
Sustainability
No sustainability metrics on file for this product.