Soundproofing & Acoustics comparisons
Airborne vs impact noise, and which acoustic build-ups actually work in real homes.
Soundproofing & acousticsAirborne vs Impact Soundproofing
Airborne noise (voices, TV) is controlled mainly with mass, absorption and decoupling; impact noise (footsteps) is controlled mainly by decoupling and resilient layers. The two need different treatments, so the first step is identifying which problem you actually have — many failed jobs add mass to an impact problem and wonder why it didn't work.
Read comparisonAcoustic Mineral Wool vs PIR Insulation
Mineral wool absorbs sound; PIR is a rigid thermal board that reflects it. For acoustic performance — soundproofing a wall, floor or ceiling — open-structured mineral wool is the correct infill, because it absorbs sound energy within the cavity. PIR excels at thermal insulation per millimetre but does little for sound and can even act as a hard reflective layer. Choosing PIR for an acoustic problem because it 'is insulation' is one of the commonest material mistakes.
Read comparisonFloating Floor vs Direct-Fix Floor
A floating floor decouples the walking surface from the structure with a resilient layer, isolating impact noise; a direct-fix floor is rigidly connected, so footsteps transmit straight through. For impact-noise control between floors, the floating principle is essential — adding mass to a direct-fix floor barely helps because the vibration path is unbroken. The trade-off is depth and complexity, but for genuine acoustic separation the floating floor is the build-up that works.
Read comparisonResilient Bars vs Independent Wall System
Resilient bars partially decouple a lining from the structure; an independent wall fully separates it. Bars are slim and effective for moderate improvements; an independent wall gives the strongest separation where high performance or a serious noise source demands it, at the cost of floor space. The right choice depends on how much noise reduction you need and how much depth you can give up — and, in both cases, on detailing out the flanking paths.
Read comparisonSoundproofing vs Thermal Insulation
Soundproofing controls noise; thermal insulation controls heat — and while they share some materials, they are optimised for different physics. Mineral wool helps both, which is why people assume insulation soundproofs, but real soundproofing also needs mass and decoupling that thermal insulation does not, and good thermal insulation needs continuity and airtightness that soundproofing alone does not guarantee. Expecting one to deliver the other is a common and costly assumption.
Read comparisonCarpet Underlay vs a Proper Acoustic Floor Build-up
Carpet and underlay soften footfall at the surface; a proper acoustic floor decouples the structure underneath. Underlay helps a little with high-frequency, surface-level impact, but it does not break the vibration path into the joists, so the thud of footsteps still transmits below. A designed acoustic floor uses a resilient layer, mass and absorption to isolate that path — which is the difference between a softer step and a genuinely quieter room below.
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