Lewis Deck to Bellwood Park, Perth - CDI
Lewis Deck to Bellwood Park, Perth

We were asked to initially advise on potential solutions for creating an underfloor heating system to the upper floor of the property at Bellwood Park. As it was in a remote location and off the grid for mains gas the house was to be heated by a heat pump and so efficiency was a major consideration on the project.

Lewis Deck, working with Gyvlons anhydrite screeds, is able to work more efficiently than most other upper floor systems on the market as the thin screed and steel deck work in conjunction with each other to emit more heat from the floor and faster. Because of this the heat pump was able to heat the floor using less energy than with other systems and so was ideal for this project.

Timber Framed House in Scotland with Underfloor heating upstairs using the Lewis Deck system
Timber Framed House in Scotland with Underfloor heating upstairs using the Lewis Deck system

The Lewis Deck was laid in less than two days, the underfloor heating pipes were put down in 2 days just ahead of the screed pour – using a clip rail system and Lewis pipe clips. The screed was poured in one day and ready to walk on within 48 hours. So the whole system was installed and ready for the next stage of works in less than 7 days.


Lewis Deck and UF heating pipes within a timber frame self build house

Lewis Deck Specification:

  • 52mm total depth Gyvlon liquid with a 20mm minimum screed cover to the heating pipes
  • 16mm Lewis Deck (laid floating)
  • 6mm Lewis acoustic tape
  • Mineral wool acoustic flanking strip between the Lewis Deck and the perimeter of all walls (for expansion and acoustic separation)

For more information on the project and Lewis Deck specification/performance please contact CDI Innovative Building Materials:

01388 728833

Anhydritec Ltd (Gyvlon Screeds), Warrington: Tel 01925 428780 www.anhydritec.com
Muir Walker & Pride Architects, Perth: Tel 01738 440080 www.mwparchitects.co.uk


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.

  • 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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Lewis Deck to Bellwood Park, Perth - CDI