Flanking Paths: The Hidden Highways of Sound
Even with heavy walls, sound can slip around via ducts, outlets, gaps, and continuous framing. These shortcuts, called flanking paths, explain why impressive materials sometimes disappoint in real homes. Seal electrical boxes, isolate mechanical runs, and stagger studs to disrupt travel. Treat door undercuts, window frames, and floor-wall junctions with attention equal to the main barrier. Thoughtful detailing transforms good assemblies into reliably quiet spaces, especially in multi-family buildings.