ROCKWOOL Comfortbatt® for Exposed Floors & Crawlspaces

Don't let uninsulated floors drain your home's comfort and energy efficiency. ROCKWOOL Comfortbatt® is specifically engineered to insulate exposed floor joists over unconditioned spaces like vented crawlspaces and unheated basements. Its semi-rigid structure and friction-fit design make installation between floor joists straightforward, creating a continuous thermal break that keeps living spaces warmer in winter and cooler in summer, while also dampening impact noise from foot traffic.

• R-Value: R22
• Thickness: 5.5 inches (140mm)
• Dimensions per Batt: 15.25" (W) x 47" (L)
• Coverage: 8 batts per bag (39.8 sq. ft.)
• Fire Rating: Non-Combustible
• Moisture Resistance: Hydrophobic

1. Fights Cold Floors & Heat Loss: Installing batts between floor joists significantly reduces heat transfer to cold, unconditioned spaces below, eliminating drafts and cold spots for enhanced comfort and lower heating bills.
2. Resists Crawlspace Moisture: Unlike fiberglass, stone wool's hydrophobic properties prevent it from wicking moisture from damp crawlspace air. It retains its R-value and will not sag, rot, or support mold growth in high-humidity environments.
3. Reduces Noise Transmission: Effectively absorbs airborne and impact noise (like footsteps) traveling through floor assemblies, contributing to quieter multi-story living.
4. Easy Installation in Tight Spaces: The batts are easy to handle and friction-fit snugly between joists. They can be cut with a serrated knife to fit around plumbing, wiring, and joist hangers.
5. Fire Barrier at Critical Juncture: Provides a non-combustible insulation layer, enhancing fire safety at the floor level, which can help slow fire spread between stories.