New Rochelle Drywall Pros builds STC-rated acoustic partitions that hit their sound targets in the field, not just on the submittal. Commercial specs increasingly call for a defined STC rating on conference rooms, guestroom demising walls, medical exam rooms, and tenant separations, and reaching that number takes decoupling, mass, and cavity absorption working together. We build the assemblies with resilient channel, dense mineral wool, additional board layers, and acoustic sealant exactly as the rated assembly requires. Detailing and sealing the wall properly is what turns a spec'd STC into real-world quiet.
When the drawings name an STC target for a wall, that rating comes from a tested assembly, and the number only holds if the wall is built exactly as tested. We match the stud gauge and spacing, cavity insulation, board layers, and sealant details to the referenced assembly. Building the complete tested assembly rather than approximating it is what lets the wall meet its rated STC.
The most effective step in a high-STC wall is breaking the direct path that carries vibration through the framing. We install resilient channel to float the board off the studs, which decouples the finished surface and stops sound from passing straight through the assembly. On the most demanding separations we use double-stud or staggered-stud framing where the assembly calls for it.
An empty cavity lets sound resonate, so we pack the stud bay with dense mineral wool, which absorbs airborne noise and adds fire resistance. To block low-frequency noise we add mass, typically a second layer of 5/8-inch board, sometimes with a damping compound between the sheets. Cavity absorption plus added mass is the core of nearly every rated acoustic assembly.
A high-mass wall is defeated by the gaps around it, so we seal the perimeter, the head-of-wall, and every penetration with acoustic sealant and carry the wall full-height where flanking over the ceiling would otherwise ruin the rating. Backer boxes and putty pads on outlets keep sound from leaking through electrical penetrations. Closing these flanking paths is what makes the difference between a wall that tests well and one that is actually quiet.
Based in New Rochelle, we install acoustic soundproofing for clients in Scarsdale, White Plains, Larchmont, Mamaroneck, and Greenburgh.