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: http://www.apexacoustics.co.uk/low-frequency-impact-sound/

Available Systems

Lewis Deck

Lewis Deck

LEWIS Deck is a composite floor system, giving a thin, but extremely sturdy concrete floor over traditional or metal web timber joists. The Lewis system works very well with underfloor heating and cooling systems, providing a metal deck that conducts the heat across the floor and a screed or concrete to provide the mass. LEWIS …

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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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Case Studies

Self Build & Renovations

FAQs

Ask CDI a Question

  • Q

    Do I keep my joist centres at 400mm when using Lewis Deck?

    A

    One of the great things about using Lewis Deck is that it opens up a number of different options for you and one of them is around joist centres you can work with.

    Traditionally we see the vast majority of architects and designers insisting that timber joists be installed at either 400mm or at most 600mm because this is the limit of what timber floor systems will effectively span to. Now with Lewis, because of its unique profile (with the dovetails dimensions) and the way it interacts with the thin (50mm) screed laid on it, you can actually go much wider than these figures. With a 50mm screed, on top of the sheets, Lewis allows you to have unpropped centres of up to 1200mm (1.2m). Even at these much wider centres Lewis will allow you to have a permissible load of 14.8kN/m2, which in English is just under 1.5 Tonnes per m2. Now this might sound fantastic, and it is, but in reality for 95% of new build homes this figure won't really make too much difference to what you were planning on doing with upstairs. What it does mean though is that at your normal centres, of approximately 600mm, your floor becomes so much stronger than traditional forms of floor structure that it allows you to do things on the 1st floor that you take for granted on the ground floor. First of all is the obvious one, you get a solid floor, meaning no more squeaky floor boards or hearing people walking around upstairs and knowing exactly where they are up there! Having the solid floor gives you the chance to have a very efficient underfloor heating system (see our applications section for more details) which in most cases will probably mean a slight reduction in your fuel bills. Other big benefits of having a stronger floor upstairs include being able to have either thinner tiles or much heavier tiles than you can use on timber floor systems. The screed and Lewis working together pretty much stops any deflection in the floor meaning that these types of tiles won't crack or move and lift over time as the floor doesn't move or deflect! So in conclusion yes you can have much wider joist centres than the 400mm centres that you normally see on new developments but even if you wanted to keep them the same by using Lewis Deck it opens up so many benefits that you just aren't able to incorporate with traditional timber floor systems.

    Q

    Do you fix Lewis Deck down to the joists?

    A

    The short answer to this is no Lewis Deck doesn't have to be fixed down.

    Generally the reason why people choose to use Lewis Deck over more traditional floor systems is that they are looking to enhance the upper floor that they are working on. So if you are going to be looking at using Lewis then you might as well look to incorporate its full range of benefits. One of which is the major uplift in acoustic performance that you get from using the system. Getting the best results, acoustically, is achieved by laying the floor as a floating floor. This then creates separation between the supporting floor joists and and the steel deck. To enhance this further introduce a resilient strip on top of the joist. See below. [caption id="attachment_559" align="alignnone" width="300"]Lewis Metal Dovetailed Sheeting Deck with acoustic Sylomer resilient strips Lewis Metal Dovetailed Sheeting Deck with acoustic Sylomer resilient strips[/caption] When it comes to determining which of our acoustic resilient strips to use (because we have a few of them and they all do different jobs depending on the use of them and the type of structure below) we are happy to help you come up with the correct option that suits your project the best. A standard Lewis Deck floor detail (such as the detail above) easily achieves UK requirements for acoustic (as well as fire) resistance for residential separating floors. Higher performance standards are easily achievable too. Because of this we have seen Lewis Deck used frequently in in bespoke projects such as live music/ theatre venues, cinemas, recording studios, specialist test labs, plant room floors and many other commercial applications. Also as well improving improving the noise reduction between floors by not having to fix the sheets down you are massively speeding up the installation process!! Having to spend less time on site could have a positive knock on effect on the cost of your project. Please feel free to give us a call and discuss this further should you wish to do so.

    Q

    Lacomet – How come it has no scrap value?

    A

    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

    Do you fix Lewis Deck down to the joists?

    A

    The short answer to this is no Lewis Deck doesn't have to be fixed down.

    Generally the reason why people choose to use Lewis Deck over more traditional floor systems is that they are looking to enhance the upper floor that they are working on. So if you are going to be looking at using Lewis then you might as well look to incorporate its full range of benefits. One of which is the major uplift in acoustic performance that you get from using the system. Getting the best results, acoustically, is achieved by laying the floor as a floating floor. This then creates separation between the supporting floor joists and and the steel deck. To enhance this further introduce a resilient strip on top of the joist. See below. [caption id="attachment_559" align="alignnone" width="300"]Lewis Metal Dovetailed Sheeting Deck with acoustic Sylomer resilient strips Lewis Metal Dovetailed Sheeting Deck with acoustic Sylomer resilient strips[/caption] When it comes to determining which of our acoustic resilient strips to use (because we have a few of them and they all do different jobs depending on the use of them and the type of structure below) we are happy to help you come up with the correct option that suits your project the best. A standard Lewis Deck floor detail (such as the detail above) easily achieves UK requirements for acoustic (as well as fire) resistance for residential separating floors. Higher performance standards are easily achievable too. Because of this we have seen Lewis Deck used frequently in in bespoke projects such as live music/ theatre venues, cinemas, recording studios, specialist test labs, plant room floors and many other commercial applications. Also as well improving improving the noise reduction between floors by not having to fix the sheets down you are massively speeding up the installation process!! Having to spend less time on site could have a positive knock on effect on the cost of your project. Please feel free to give us a call and discuss this further should you wish to do so.

    Q

    Lacomet – How come it has no scrap value?

    A

    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.

Ask CDI a Question

Latest Blog

CDI 2017

Granite tiles and shower tray laid over a Lewis Deck and Concrete floor upstairs over timber joists

Travertine wetroom by Craig Bills

30th May 2017

Craig Bills is a master tiler and has been installing wet-rooms using Lewis Deck and concrete for over 20 years, he is a passionate advocate for the Lewis Deck system in wet-rooms and bathrooms as it give an opportunity for the floor to be 1 piece of waterproofed concrete.  This makes a very robust and …

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We've a new model down at Swindon!

18th May 2017

One of the great benefits that you get from introducing Lewis Deck into a residential development is the option to install a wet room floor into bathroom/ en-suite areas with extreme ease compared to other flooring systems as well as maintaining one solid concrete slab in the room reducing the possibility of leaks from a …

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