If you have ever heard every footstep from the floor above, you are dealing with impact noise on timber floors. It is one of the most common acoustic problems in Irish homes and one of the easiest to fix at first fix stage if you know what products to use.
This guide covers what impact noise on timber floors is, why it happens, and the right build-up to deal with it properly.
What Is Impact Noise on Timber Floors?
Impact noise is sound created by something physically hitting a surface. Footsteps, dropped objects, furniture being moved. The energy from that impact travels directly into the floor structure and radiates out as sound in the room below.
Timber joist floors are particularly bad at stopping this. Unlike a concrete slab which has mass on its side, a timber floor is a series of boards fixed to joists with air gaps in between. Every direct point of contact between board and joist is a path for impact vibration to travel through.
The more contact points there are, the worse the impact noise on timber floors becomes. This is why an untreated timber floor can feel like you can hear everything happening upstairs.
Why Standard Insulation Is Not Enough
A lot of people fill the joist cavity with standard insulation and assume the job is done. It helps with airborne noise like voices and music. But it does not address impact noise on timber floors because that type of noise travels through the structure itself, not through the air.
To stop it you need to break the structural connections that let vibration travel. That means decoupling the layers of the floor from each other so the impact energy has nowhere to go.
The Right First Fix Build-Up
The most effective approach to reducing impact noise on timber floors is a layered system put in place before the boards go down. Here is how it works.
Step 1: Isolate the joists. The first and most important step is stopping direct contact between the floorboard and the joist. The AM Resilient Roll is a self-adhesive 5mm closed-cell neoprene joist tape that sticks to the top of each joist before the boards are laid. It creates a resilient layer between the two surfaces, absorbing impact energy before it can travel into the structure. Unlike foam alternatives, closed-cell neoprene does not compress permanently under load so it keeps working long term.
Step 2: Fill the joist cavity. Once the joists are isolated, fill the voids between them with a high-density acoustic slab. Rockwool RW3 Slab friction-fits between joists with no adhesive needed and reduces airborne sound transmission at the same time. At 60kg/m³ it is dense enough to make a real difference.
Step 3: Add a high-density board layer. Board over the joists with a dense acoustic layer such as the AM Soundproofing Eco Board. This adds mass above the joist line and further reduces impact noise on timber floors before your final floor finish goes down.
Each layer on its own makes a difference. All three together give you a genuinely high-performing acoustic floor.
Why the Joist Tape Is the Step Most People Skip
Most people focus on what goes in the cavity or on top of the floor. The joist tape gets overlooked because it is invisible once the floor is down and it feels like a small detail.
It is not a small detail. Without it every board is in direct contact with every joist. That direct contact is a highway for impact vibration no matter how good the other products in the build-up are.
Fitting the AM Resilient Roll takes minutes. Peel it, stick it to the top face of each joist, and lay the boards as normal. It is the easiest step in the build-up and one of the most important for controlling impact noise on timber floors.
Does This Meet Irish Building Regulations?
Part E of the Irish Building Regulations sets out acoustic performance requirements for floors in new dwellings and buildings containing flats. A properly specified timber floor build-up using joist isolation tape, acoustic fill, and a high-density board layer can meet or exceed these requirements.
If you are building to Part E compliance, always check your full specification against the Irish Building Regulations Part E requirements and get sign-off from your engineer or assigned certifier.
Shop AM Resilient Roll in Ireland
The AM Resilient Roll is available now from Acoustic Materials Ireland. Priced from €27.99 inc. VAT with nationwide delivery and free click and collect available.
Shop the AM Resilient Roll here.
For advice on quantities or the right full system for your project, contact the team on sales@acousticmaterials.ie or call +353 1 201 5746.
Related reading: Floor Soundproofing Ireland | How to Stop Noise Between Floors
