Core idea: Compare materials by function rather than marketing label.
Five functions
Systems combine mass, absorption, decoupling, damping and airtightness.
No magic layer
One thin product rarely solves speech, impact and bass.
Tested systems
Prefer complete assembly evidence.
Constraints
Space, weight, moisture, fire, labour and access matter.
A practical planning sequence
- Describe the source, timing and frequency character.
- Trace direct and flanking paths.
- Set a realistic improvement goal.
- Compare complete systems and local requirements.
- Document the baseline and inspect details during work.
- Repeat the same test afterward.
What cannot be guaranteed online
No website can promise a specific reduction in an unknown building. Field results depend on construction, workmanship, connected structures, openings and the source.
Written by Martin R. Calderwood.