Sound transmission ratings, mineral wool comparison, resilient channel installation, and practical guidance for reducing noise between rooms and floors in Canadian homes.
Technical overviews of ratings, materials, and methods — written for homeowners and contractors working on noise-control projects in Canada.
A breakdown of Sound Transmission Class and Impact Insulation Class scales, how assemblies are tested, and what minimum values the National Building Code of Canada requires.
How resilient channels, hat channels, and staggered-stud framing break the structural path that carries impact and airborne noise between building elements.
Side-by-side look at mineral wool, fiberglass batts, cellulose, and acoustic-grade drywall — including NRC values, fire ratings, and typical installed cost ranges in Canada.
Noise between rooms and floors travels through two routes: through the air (airborne noise) and through the structure itself (impact noise). Addressing only one rarely produces satisfying results.
The National Building Code of Canada sets minimum STC and IIC thresholds for party walls and floor-ceiling assemblies in attached housing. Many retrofit projects in older detached homes fall below those minimums — not because of a code violation, but because those standards didn't apply when the building was constructed.
Understanding how ratings are measured and how materials interact with framing systems is the starting point for any effective soundproofing project.
These are representative values for standard construction in Canadian residential buildings. Actual performance depends on workmanship and flanking paths.
| Assembly | Typical STC | Notes |
|---|---|---|
| Single 2×4 stud wall, no insulation, single layer drywall | 33–36 | Normal speech audible through wall |
| Single 2×4 stud wall, mineral wool batt, double-layer drywall | 45–48 | Loud speech faint; meets NBC minimums |
| Resilient channel wall, mineral wool, double drywall | 52–56 | Shouting barely audible; good party wall |
| Staggered-stud wall, mineral wool, double drywall each side | 55–60 | Near-silence for normal speech levels |
| Concrete slab floor, no finish | STC 58 / IIC 28 | High airborne; poor impact performance |
| Wood joist floor, acoustic mat underlay, floated finish | STC 50 / IIC 52 | Meets NBC minimums with proper detailing |
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