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					                                            Use a cavity tray if masonry above ground,                                               It is a common design fault to finish the basement wall beneath ground level allowing
       Cast a ledge board in place of a
                                            waterproof concrete for 600mm if Polarwall.                                              water in over the top; usually because block and beam is chosen for this internal floor
       Polarwall panel and support
                                                                                                                                     level.
       engineered timber beams on
                                                                                                                                     If beam and block is used, see the alternative details. Polarwall is available (as
       standard joist hangers casting
                                            Engineered truss floor                                                                   standard) in 4 concrete widths so steps and upstands are fairly simple. Fill the ends of
       waterproof concrete (with
                                                                                                                                     beam and block with waterproof mortar and over paint with Elasto Cover and continue
       waterproof joints) up to well
                                                                                                                                     well down the face of the upstand. Where Polarwall is not used above the basement, it
       above ground level.
                                                                                                                                     would be better to extend the upstand alongside beams up to the top of beam level.
       Traditional brickwork can be                                                                                                                                     (Note: The wall is only 'retaining' below ground and
       built off a ledge as shown              Plasterboard                                                         The upstand is poured in one. No joint.             retaining very little at the top where it can be thinner.
       (which can vary in height as the                                                                                                                                 'Propped' cantilever floors are a bit complex, ask the
                                               Studwork to protect membrane, house
       ground level changes). Render,                                                                                                                                   structural engineer for a cantilever design.
                                               services and contain insulation
       siding or brick slips are also
       used to decorate Polarwall.             Internal drained cavity membrane
                                                                                                                         Water management membrane, with geotextile filter, if external drainage is used.

         Note:
                                                                                                                                               Perforations through the wall, such as soil pipes, can have a twisted
         In general we use waterproof concrete with external drainage where                                                                    rope of Denso tape wrapped round to create effective puddle
         the ground drains or internal drainage membrane where it might not.                                                                   flanges.
         Where we use internal drainage, we can expose one face of the water-
         proof concrete, inspect it and repair it as deemed necessary on site.
         This can be either the inside or the outside face. The other side will                                                                                         Other ground level details
         have polystyrene formwork remaining as insulation. Extra insulation
         can be put within internal studwork later.
                                                                                                                                                                         are shown on two other
         Options include chiselling out poor concrete and joints and refilling with                             After the wall is poured expose the
                                                                                                                                                                                drawings.
         sharp sand mortar waterproofed with Compact All Civil; applying WPL                                    joint and remove any poor
         waterproof render over the top; painting or spraying 3 coats of Elasto                                 concrete. Replace with sharp sand
         Cover liquid membrane.                                                                                 mortar waterproofed with Compact
                                                                                                                All Civil. This can be either side or
         Careful consideration is to be given to the susceptibility of the repair to                            both sides as appropriate on site.
         damage by groundworkers when backfilling and compacting.
                                                                                                                Elasto Cover compressible liquid
                                                                                                                                                                Please note that the Elasto Cover membrane and the
                                                                                                                membrane poured or brushed on
                                   Screed                                                                                                                       Compact All Civil concrete mortar repairs may be either
                                                                                                                at least 1mm thick in 3 layers.
                                                                                                                                                                under or against any part of the wall where they do not
                                  Insulation                                                                    Polystyrene replaced as necessary.              interfere with the design of the structure. Working room,
                                    Internal drained                                                                                                            cleanliness, water and weather, size, spacing and position
                                   cavity membrane                                                                                                              of steel will influence this choice uniquely on each site.

                                                                        Structural
                                                                        slab                                                                                                    c
                                                                                                                                                                                    Newmil Buildings Ltd
                                    sump

                                                                                                         Perforated pipe to soakaway. Wrapped in geotextile              All branded products available from
                                                                                  Concrete waterproofed membrane and surrounded with pea shingle also                          Waterproof Concrete Ltd
                                                                                  with Compact All Civil wrapped in geotextile membrane.
                                                                                                                                                                                     www.waterproofconcrete.co.uk
                                                                                               If external drainage is relied upon, the drainage should be
                                                                                               designed to work in all seasonal and weather conditions and for                                       Drawn by PCS
                                                                                               the lifetime of the building.
                                                                                               Landscape the ground to slope away from the basement.                  Overall system of              Not to scale
                                                                                               Have 2 soakaways well apart, one for roof water and the other
                                                                                                just for the basement. Be mindful of soil draining characteristics.
                                                                                                                                                                       waterproofing
                                                                                                                                                                                                      January 2008
                                                                                               Make all drainage roddable. Wrap everything in geotextile filter.        basements
                                                                                                                                                                                                     Revision: E

Wall concrete needs to be delivered into the wall properly through a pipe threaded to within 1200mm of the bottom. The pipe will need to be smaller than the concrete
pump’s boom pipes so a reducer is needed. Ensure readymix concrete is available with 10mm aggregate within a 40 minute journey time before choosing our solution.
Unfortunately volumetric mixers cannot be used because they cannot mix in the Compact All Civil.

				
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