Acoustic timber flooring in NZ: what makes a floor quieter
Want a quieter timber floor? Most of the difference comes from three things: a good acoustic underlay, gluing the boards down rather than floating them, and a flat, sound subfloor. Get those right and an engineered oak floor feels solid and quiet underfoot, though the result always depends on the underlay, subfloor and install.
What actually makes a timber floor quieter
There is no single quiet floor. Sound comes down to the whole system: the underlay or acoustic mat under the boards, whether the floor is glued down or floating, how flat and solid the subfloor is, and the adhesive that ties it together. A good acoustic underlay is the single biggest lever on impact sound, the thud you hear from footsteps, subject to the system used.
Two kinds of noise matter. Impact sound is footsteps, dropped items and chair scrapes travelling down into the room below. Airborne sound is voices and TV passing through the floor. In apartments and upstairs rooms, impact sound is usually the one people notice, and it is the one the underlay and install method target. If you are new to the format, our guide to engineered timber flooring covers how the boards are built.
Glue-down vs floating: which is quieter
Bonded to the subfloor
The boards are bonded straight to the subfloor with a full-spread adhesive, usually over an acoustic underlay glued down first. Gluing the boards down, rather than floating them, tends to give a more solid, quieter feel underfoot, though this depends on the subfloor and adhesive used. It is the method we usually recommend for apartments and upper floors.
- Solid feel, less hollow sound
- Preferred for apartments and body-corporate builds
- Needs a flat, sound, dry subfloor
- Pairs with an acoustic underlay glued underneath
Laid loose over underlay
The boards clip together and sit loose over a foam or rubber underlay, not fixed to the subfloor. It is faster to lay and forgiving of a less-than-perfect subfloor, but a floating floor can feel and sound more hollow underfoot unless a quality acoustic underlay is used. See our timber flooring installation guide for how each method is laid.
- Faster, no adhesive
- More hollow feel without the right underlay
- Handy over some existing floors
- Check your body corporate allows it
The acoustic underlay does the heavy lifting
If you only get one layer right, make it the underlay. Vienna Woods stocks acoustic underlays built for exactly this, designed to sit under a glued-down floor and soften impact sound, subject to the system used. The right one depends on your subfloor, whether you need moisture protection, and the acoustic rating your building sets.
Cork-rubber acoustic mat
A dense cork-and-rubber mat, typically glued to the subfloor with the timber then glued on top. A good pick where you want a high-performing layer under a glued-down floor in an apartment.
- Glue-down system: mat first, then boards
- Suits apartments and upper floors
- Dense, load-bearing feel
Twin-foam AquaStop underlay
A smart double-foam underlay with a built-in moisture-blocking surface, made for upstairs areas and apartments where both sound and damp matter. Also stocked in a 3mm version.
- Combines an acoustic and a moisture layer
- For upstairs and apartment builds
- Ask us which suits your subfloor
The right adhesive is part of the acoustics
The glue matters more than people expect. Vienna Woods carries the Parabond flexible adhesive system for glue-down timber floors. An MS-polymer adhesive like Parabond stays flexible once cured, which can help dampen sound transfer through the floor, subject to the full system. A rigid, brittle glue does the opposite.
Moisture is a separate job. The adhesive is not a standalone damp barrier: on a concrete subfloor you test the moisture first, then use the matching primer from the system for that reading before you glue. Getting the moisture control right protects the floor and keeps the acoustic layer doing its job.
Planning for apartments and body-corporate rules
On an upper floor or in an apartment, the acoustics are not just about comfort. The Building Code clause G6 sets minimum airborne and impact-sound levels for floors between tenancies, and most bodies-corporate add their own rule that a hard floor must sit on an acoustic underlay to a set rating.
We cover this in full in what NZBC G6 actually requires for timber floors in apartments, including the two numbers, why a timber floor is an Alternative Solution, and how to read an acoustic underlay datasheet without being misled.
Design the system to hit the number your building specifies. Vienna Woods cannot guarantee a specific decibel or impact-sound rating, because performance depends on the whole system: the number your building needs must be designed in and confirmed by the supplier or an acoustic engineer. Bring us the requirement early and we will help you build a floor spec that aims to meet it.
Four steps to a quieter timber floor
1. Check the subfloor
Flat, dry and sound. Test a concrete subfloor for moisture. A poor subfloor undoes even the best underlay.
2. Choose glue-down
For apartments and upper floors, a glued-down floor over an acoustic underlay is usually the quieter, more solid option.
3. Match underlay and adhesive
Pick the acoustic underlay and the Parabond adhesive to suit your subfloor and any rating your building sets.
4. Confirm the spec
If a body corporate or the Building Code sets a rating, have it confirmed before you order, then order free samples to feel the finish.
Common questions
Does timber flooring make a room noisier?
Not if it is designed well. A glued-down engineered floor over a good acoustic underlay can feel quiet and solid underfoot, though the result always depends on the underlay, subfloor and install. The cheap floating floor on thin foam is what people picture when they say timber is noisy.
What is the quietest way to lay a timber floor?
Gluing the boards down over an acoustic underlay, on a flat and sound subfloor, generally gives the most solid, least hollow result, subject to the system used. Floating floors are faster but can sound more hollow.
Do I need an acoustic underlay for an apartment?
Almost always. Most bodies-corporate require a hard floor to sit on an acoustic underlay to a set rating, and the Building Code sets minimums between tenancies. Check your building rule before you choose a floor.
Can Vienna Woods guarantee a decibel rating?
No. Acoustic performance depends on the whole system, the underlay, subfloor, adhesive and install, so we cannot promise a set decibel or impact rating. We help you design a system that aims to meet the rating your building specifies, confirmed by the supplier or an acoustic engineer.
What underlay and adhesive do you recommend?
For glued-down floors we carry acoustic underlays, a cork-rubber mat and a twin-foam AquaStop, plus the Parabond adhesive system. The right combination depends on your subfloor and any acoustic rating, so talk to us with your building requirement.
Plan your floor
Installation guide
How we glue down and lay engineered timber floors, step by step.
Care and cleaning
Keep a quiet floor looking and feeling right for years.
Order free samples
Feel the finish and the board in your own light before you commit.
Planning a quieter floor?
Order free samples to feel the finish, or send us your building acoustic requirement and we will help you spec a floor that aims to meet it.
