Soundproofing and fire separation are important design considerations in mid-rise wood buildings. The illustrated assembly functions as both an acoustic control layer and as a fire-rated assembly. ROCKWOOL SAFE'n'SOUND® batt insulation is non-combustible and has superior sound absorption, which makes it an ideal product for this application.

Stone wool insulation limits noise transmission between floors and is effective against low-frequency bass ranges, which contributes to a more comfortable occupant experience. SAFE'n'SOUND® paired with resilient channels, delivers sound absorption relief from the nuisance of impact noise caused by footsteps, door- slamming and furniture movement in adjacent units.

The product also combats airborne noise such as music, speech, and car traffic, with a high-density, non-directional fiber structure that is engineered to fit snugly between floor joists in the interior floor assembly.

With respect to fire, ROCKWOOL non-combustible stone wool insulation materials can withstand intense heat up to 2150°F (1177°C), and will not promote the spread of flame or produce toxic smoke. This provides occupants with critical extra time to exit the building safely.

Filling the ceiling cavity space entirely with stone wool insulation (maximum 2" air space) is recognized as an exemption from the National Fire Protection Association NFPA 13. This allows sprinkler systems within ceiling cavities to be omitted, which can reduce building construction costs.