Div 07 · Thermal & Moisture Protection
Thermafiber FireSpan 40
O
Owens Corning · FireSpan 40
A 4 pcf semi-rigid mineral wool board for curtain wall spandrel areas where fire performance is required alongside thermal insulation.
✓ Verified 2026-08-28
Specs on this page were checked against Owens Corning Thermafiber FireSpan data sheet on 2026-08-28.
Specifications
| Density | 4.0 lb/ft3 nominal |
| Thickness | 2 in to 7 in in 1/2 in increments |
| R-value | 4.3 per inch |
Certifications & Standards
ASTM C612
ASTM E84
ASTM E136
ASTM E2307
Attributes — product claims, not third-party certifications
NoncombustibleMineral wool
Sustainability
Recycled Content
Minimum 70%