Acoustic floors in all projects, new-build and refurbishment

Acoustic or “soundproof” floors are the floors between two rooms of a house, upstairs and down, between flats, one over the other or between spaces of different use, for example an apartment over a restaurant.

Acoustic separating floors can simply be used to improve the comfort of the occupants, for example to reduce the noise of the kids running about upstairs in a house or to meet the requirements of building control under part E of building regulations, or the Scottish Building Warrant.

The types of sound that are considered for these types of floors are Airborne and Impact:

Airborne Sound

Airborne sound is the noise associated with speech, the TV or other sources where the sound travels through the air.

Impact Sound

Impact sound is the noise of people moving about or sources of noise directly on top of the floor, for example people walking on a floor above or a base speaker in a cinema room.

Acoustic floors aim to reduce these two types of noise.

We have a number of acoustic floor solutions available to achieve exceptionally high levels of separation between levels of a building.  These can be simply high performance floors within houses to provide extra comfort and quality within the build, through to floors with the toughest performance requirements separating loud commercial spaces from residential ones.

Examples of these include venues with live music from apartments above through to cinema floors and roof spaces with building services machines installed on the finished floor.

The technical bit

Sound is a type of vibration and it is these vibrations that pass through the structure of the building to cause nuisance, our floor systems introduce isolated stiffened mass into the building to slow/stop/dampen these vibrations. Combine this with the rest of the floor build-up including the ceiling treatment, insulation between the joists and resilient strip on top of the joists, creates a complete and very high performing acoustic solution.

Introducing this mass into lightweight floors utilising any type of timber joists helps to overcome the common low-frequency impact noise issues associated with these types of structures.  This low frequency noise (typically 100Hz and lower and most annoying at around the 20Hz range) isn’t measure within Part E of building regulations, but is often a cause for complaint as it is the frequency range associated with foot fall noise from above.

Discussed in more detail here:

Available Systems

Lewis Deck

Lewis Metal Dovetailed Sheeting Deck with acoustic Sylomer resilient strips

LEWIS Dovetailed metal decking, as part of a joisted floor system, provides a first class solution where acoustics and fire protection are key concerns. The Lewis system works very well with screeded underfloor heating and cooling systems, allowing them to work more efficiently than without the sheets in place. LEWIS provides a number of solutions …

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Max 4

Max4 without UFH

Max4 reinforcing sheets provide a great solution for leveling uneven existing floors with the introduction of reinforced ultra thin light weight liquid screed floors in projects where weights and height restrictions are an issue. The Max4 reinforcing sheets are manufactured from 2 sheets of special profiles steel and designed for use on existing timber or …

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Ask CDI a Question

  • Q

    What are the Lewis Deck sheet sizes?


    Q: What sheet sizes are held in stock for delivery within a few days after order? A: We stock 2500mm and 1300mm sheets.  These are all 630mm wide and 16mm deep.  Deliveries are made via the pallet network directly to site.  The smaller sheets are aimed at small bathroom renovation projects and can be supplied in small numbers via TNT. 2.5* and 1.3m sheets allow for the 100mm overlap to occur over a joist, with joist centres being either 300mm, 400mm, 600mm, 800mm*, 1200mm and 2400mm*. (*2.5m sheet only) For larger projects we are able to produce bespoke sheet sizes if required, please get in contact to discuss other options for sheet sizes.


    Lacomet – How come it has no scrap value?


    Lacomet – How come it has no scrap value? Many of the projects that we get involved in starts with a phone call or email to us from someone researching replacing stolen leadwork. Many of these are old buildings, such as schools or churches, where this isn’t the first time that the lead has been stolen and they call us fed up with having to replace it again full in the knowledge that they will more than likely go through the same problem once more in the near future if they continue to use lead. One of the big benefits that Lacomet FL brings to a project is the fact that it has no scrap value and therefore the chances of it being stolen are massively reduced. Due to the 2 thin aluminium layers, and its five layer total construction, it is of no value to thieves. Lacomet can be recycled but the polyester based coating would need to be de-laminated first and the amount of recovered aluminum is then very low, in fact it would be easier and more profitable to collect empty drinks cans than to mess about stripping Lacomet down. We can also supply stickers that can be placed in strategic locations informing people that what is now on the roof is not lead and that it has no scrap value.

  • Q

    Why don't my Lewis sheets interlock like they do in the video?


    Q: Why don't my sheets interlock like they do in the video? A: The sheets have two sides (one printed, one plain), the dovetails on either side are different widths, it is then necessary to alternate the sheets print up and then print down.


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Acoustic floors in all projects, new-build and refurbishment