Roxul Safe Insulation 2'x4'

Roxul Safe Insulation 2'x4'

from 14.95

ROXUL SAFE™ is a lightweight, semi-rigid stone wool insulation that provides superior fire resistance and sound control. ROXUL SAFE™ is UL and Intertek approved as a forming material for numerous firestop systems. This product is designed to fill perimeter gaps between concrete floor slabs and exterior wall systems, between firewalls and ceiling slabs, and around conduit pipes and duct openings through walls and floor slabs.

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  • Non-combustible stone wool insulation with melting point of approx. 1177°C (2150°F)

  • Does not promote smoke or flame spread when exposed to flame

  • Minimal shrinkage to maintain critical line of defense against fire

  • Low thermal conductivity

  • Water and moisture resistant; does not absorb moisture to maintain insulating value

  • Does not rot or promote the growth of mildew, fungi or bacteria

  • Can be faced with reinforced foil facings

  • ROCKWOOL® can contribute to earning LEED® points



ASTM C612 Mineral Fiber Block and Board Thermal Insulation - Type IVA Compliant
339-97-M MEA Approval, New York City Approval

Corrosion Resistance

ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
ASTM C665 Corrosion of Steel - Passed


ASTM C303 Actual Density - 4.5 lb/ft³ (72 kg/m³)


24" x 48" (610 mm x 1219 mm) 

Reaction to Fire

ASTM E84 (UL 723) Flame spread index = 0 ; Smoke developed index = 0
CAN/ULC S102 Flame spread index = 0 ; Smoke developed index = 0
CAN/ULC S114 Determination of Non-Combustibility of Building Materials - Non-Combustible
ASTM E136 Determination of Non-Combustibility of Building Materials - Non-Combustible
CAN/ULC S115Fire Tests of Firestop Systems
ASTM E814 (UL 1479) Fire Tests of Penetration of Firestop Systems
UL 2079 Tests for Fire Resistance of Building Joint Systems
ASTM E2307/E119 Perimeter Fire Barrier Systems
CAN/ULC S129 Smolder Resistance - 0.01%
Consult UL, ULC and Intertek Directories for fire rated designs

Reaction to Moisture

ASTM C1104 Moisture Sorption - 0.04%
ASTM C1338 Determination of Fungi Resistance - Passed


Product is available in 2", 3" and 4" (50.8 mm, 76.2 mm and 101.6 mm)


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Roxul Safe Insulation ships within 48 hours.