Go to Forum Home Building Design Built-up EPS foundation tub

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    • #31619
      Anonymous

        Hi – we want to install a solid slab reinforced concrete foundation, flat with no edge thickening, concrete 200 mm or less, on uniform 200 mm expanded PS with 200 mm perimeter EPS to the top of the slab. The ground under topsoil is a solid chalky clay bed with no known adverse effects for buildings across the surrounding region. The building is to be a 38 × 89 mm factory timber frame of simple design with tiled roof over one and two storeys, with lightweight external trusses of the Larsen type to master the EPS perimeter upstand. We have quotes from some of the German/Scandinavian prefabricated EPS foundation system suppliers. They are fairly expensive, and some include transport costs from Europe and visiting erection teams. We are interested in a built-up version of the foundation, using EPS of appropriate strength, with reinforcement to suit, designed by a UK engineer interested in such a system and able to minimise concrete and keep a flat base while satisfying local BC. We feel sure it can be done; there are examples on the web from Canada etc. Any suggestions or pointers – for both system detail and engineering – gratefully received. We are aware of earlier posts (e.g. topic ‘Thermally efficient foundations’) but would like to update.

      • #38363
        Nick Grant
        Participant

          Did exactly what you describe over 10 years ago based on pencil and paper calcs by structural engineer Alan Pearce in Leominster. Bob Johnston (structural engineer) http://m.bjse.co.uk/ has designed a few of these now as have others. Shouldn't be a problem for any structural engineer.

        • #38364
          Anonymous

            Thanks for helpful replies. Further comments and suggestions welcome.

          • #38365
            Anonymous

              Any suggestions for proven EPS for this application, from standard ranges such as Jablite and Springvale? Needs consideration of long term performance (creep) as well as design load. Thanks.

            • #38366
              Nick Grant
              Participant

                The engineer will specify this to suit.

                Nick

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