We have a number of innovative Ground Floor solutions that can be used in either new-build or renovations.

These include the FastSlab ground floor for replacing rotten suspended timber floors with an insulated, light weight screeded ground floor often incorporating underfloor heating, the FastSlab foundation system that includes steel screw-piles and an insulated ring-beam system for light weight new build houses.

We also have the insulated Op-Deck system for high loads, large spans and cantilevers that includes an optimised concrete T-beam floor design.

Ground floor solutions are always worth discussing to ensure that they fit with the project and the conditions of the proposed site or design.

This should be done as soon as possible within the detailed design phase of the project to give the best chance of success. We are always happy to provide our guidance as to whether our systems are suitable or not and if they add to the project.

Available Systems

FastSlab

FastSlab ground floor renovation system to replace an improve a timber ground floor and include underfloor heating. maintains the void

The FastSlab Ground Floor system is designed to make it quick and easy to replace existing suspended ground floors with an insulated concrete or screeded floor. This gives the solid feel of a concrete ground floor with the benefit of maintaining the ventilated void beneath to prevent moisture issues in the existing walls. The FastSlab …

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Op-Deck

Op-deck is a lightweight insulated floor system. The advantages of composite metal deck concrete floors and traditional rib floors have been combined in this unique patented flooring system. This insulated concrete floor system (ICF) is based on traditional concrete installation but with optimal design and installation flexibility. It is suited to insulated, high-load-bearing applications including …

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FastSlab Foundation

Steel Screw-piles, steel lattice ring-beam, steel internal beams and expanded polystyrene (EPS) insulation blocks with the Lewis Deck over the top

The FastSlab Foundation System is a fast track method to construct foundations and ground floors, ideal for sites with limited access, poor ground conditions, flood plain locations and areas with tree root issues. It also works equally well in all ground conditions whilst eliminating a sometimes difficult and expensive muck shift. A typical FastSlab house …

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Lewis Deck

Lewis Deck

Lewis Deck Dovetailed Sheeting Metal Decking is a composite floor system, giving a thin, but extremely sturdy concrete floor over traditional or metal web timber joists. The Lewis Deck 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 …

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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. However the joist centres are usually controlled by the load capacity of the joist and not the spanning capacity of the Lewis Deck.

    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.Note: some joists my require lateral stability and therefore lateral restraint straps or timber noggins or a sacrificial timber board may be required to achieve this, your joist supplier or designer will be able to provide this information, in some cases the Lewis Deck can be fixed down to provide this action if required.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.Note: some joists my require lateral stability and therefore lateral restraint straps or timber noggins or a sacrificial timber board may be required to achieve this, your joist supplier or designer will be able to provide this information, in some cases the Lewis Deck can be fixed down to provide this action if required.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

Lewis Deck with metal web timber joists

Creaky wooden floors

19th October 2017

We often talk to visitors at exhibitions about the issue of noisy floors, usually the issue of squeaky wooden floors, whilst our systems are often used to provide the fire and acoustic separation in an apartment situation, it is creaks and squeaks in a traditional timber boarded 1st floor that self-builders are keen to avoid. …

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CDI Added to Updated Sourcebooks

30th August 2017

It’s always good to get a little more advertising in. From today we are now listed in both Real Homes and Period Livings updated sourcebooks. You can find us at both through the following links: CDI Innovative Construction Materials CDI Innovative Construction Materials  

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