Fundamentals

Why a high-STC wall can still fail — flanking paths through floors, ceilings, ducts, and framing, how they degrade designed performance, and the early-coordination moves that keep them from undoing the spec.

The four principles every soundproofing assembly uses (mass, decoupling, damping, absorption), how STC, IIC, and NRC measure performance, and the common myths — including soundproof paint — that quietly waste budget.

Absorption lowers dB in some situations and not in others — when it does, when blocking is the right call instead, and a real St. Pete restaurant example showing what coverage actually changes the meter.

The three absorber types every room uses — porous, panel/membrane, and Helmholtz — how thickness drives low-frequency performance, where to place each, and the common mistakes that leave bass uncontrolled.