Div 07 · Thermal & Moisture Protection
MinWool Safing
J
Johns Manville · MinWool Safing
A mineral wool safing insulation compressed into the void between the floor slab edge and spandrel panel to block the passage of smoke and flame.
✓ Verified 2026-08-28
Specs on this page were checked against Johns Manville commercial mineral wool guide on 2026-08-28.
Specifications
| Density | 4 pcf |
| Thickness | 4 in standard; custom up to 6 in |
| R-value | 3.7 per inch |
Certifications & Standards
ASTM C612
ASTM C665
ASTM C1104
ASTM C1338
ASTM E84
ASTM E96
ASTM E136
UL 1479
Attributes — product claims, not third-party certifications
NoncombustibleRock mineral woolAvailable plain or foil-faced
Sustainability
No sustainability metrics on file for this product.