Understand impact sound ratings, vapour barriers and choosing the right underlay for timber-look floors on slabs.
Underlay & Acoustic Ratings Guide for Timber-Look Floors
Why underlay matters
- Acoustics: Reduces impact sound (handy in apartments and double-storey homes)
- Vapour control: Some include moisture barriers for slabs
- Comfort: Softer underfoot and helps minor subfloor variation
What to look for
- Rw/Ln,w or ΔLw numbers: Higher ΔLw = better impact sound reduction
- Moisture barrier: Essential on concrete slabs without dedicated vapour barrier
- Density & thickness: Balance comfort, stability and door clearances
Tips
- Use the manufacturer-approved underlay for warranty.
- Tape joins, seal edges per the install manual.
- In apartments, check your body corporate acoustic requirements before purchase.
Further reading: