Voices from upstairs and footsteps overhead are two different complaints. Adding a bag of insulation to the ceiling is not a complete answer to either.
The most useful acoustic conversation starts with the sounds you are trying to reduce and the construction they can travel through.
Name the noise before choosing the product
Airborne sound includes speech and television. Impact sound includes footfalls and objects striking the floor. The floor finish upstairs, the ceiling assembly below, and their connections affect what occupants hear.
The National Research Council's wood-frame sound guide explains flanking: sound can reach the next room by paths around the nominal separating wall or floor. Improving one surface does not necessarily remove those other routes.
Ask for an assembly, not a shopping list
| Detail | Question for the designer |
|---|---|
| Ceiling layers and cavity | What documented assembly is being used? |
| Resilient connections | How will they be installed without rigid bridges? |
| Adjoining walls | Where could sound travel around the ceiling? |
| Lights, ducts, and pipes | How are penetrations coordinated with acoustic and fire details? |
| Floor finish above | Can impact noise be reduced at its source? |
Substituting components or adding fasteners in the wrong place can change the result. Ask the installer to work from the selected assembly detail rather than combine appealing products by intuition.
Keep fire protection and comfort together
Ontario's second-unit guidance sets out fire-separation considerations for conversions. Have the designer confirm the current requirements for your permit and select compatible acoustic details. Fire resistance and sound reduction are different performance questions.
Do not trade away a required fire detail to fit a recessed light or an access panel. Resolve those openings as part of the assembly.
Set an honest expectation
Ask which sounds the proposed work is designed to reduce and what limitations remain. "Soundproof" is an ambitious word for a wood-framed house with shared structure and services.
A useful outcome might be less intelligible conversation and less intrusive footfall noise, while some activity remains audible. That is a much better design brief than promising silence and discovering, after painting, that the upstairs hallway still announces every school morning.