Why rock wool
Mineral wool batts are denser than fiberglass and run about R-4 per inch, so a standard 2x4 wall reaches R-15 instead of R-13. The material is noncombustible and can withstand temperatures above 2,000 degrees Fahrenheit, which makes it a common choice around fireplaces, garages and shared walls.
Sound control
Because it is dense, rock wool is excellent at absorbing sound. It is our standard recommendation for bedrooms, bathrooms, home offices, theaters and laundry rooms where noise between rooms matters.
Easy to fit well
Rock wool batts are rigid enough to cut with a serrated knife and friction-fit between studs with no stapling. That makes clean, gap-free installation easier, especially around boxes and pipes.
Moisture tolerant
Stone wool sheds water and does not wick it, so it keeps its performance if it gets damp and dries out. It also does not support mold growth on its own.
What the bid covers
- Rock wool batts at the specified thickness and R-value
- Friction-fit installation cut around wiring and boxes
- Sound walls, fire-sensitive areas and exterior walls as scoped
- Sealing of penetrations, if scoped
- Ready for insulation inspection
- Cleanup and haul-off
Questions about rock wool insulation
Is rock wool worth it over fiberglass?
For sound control and fire resistance, yes. For general wall insulation the gain is a modest bump in R-value. We often use rock wool in specific rooms and fiberglass elsewhere.
Can rock wool go in an attic?
Yes, rock wool batts can be laid between ceiling joists. For full attic floors, blown-in loose fill is usually faster and more economical.