This is shown with tongue in cheek, but is very true!
Typical British Construction Practices That CauseHundreds Of New Build Basements To Flood Every Year, Or How To Keep our Fifteen Trucks Busy in Correcting Them! New build house. |
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Excavated into clay ground Land drains proposed at the design stage but omitted because what was designed was not feasible to install. Adhesive membrane Type A Tanked Protection on the negative side of the ground retaining walls within a cavity was pushed off when grounds water pressure occurred after heavy rain. |
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The inadequately tied inner leaf of the cavity buckled with the pressure and was taken down by Trace. |
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Trace lined the ground retaining walls with cavity drainage membrane and rebuilt the removed inner leaf of the cavity block wall. Ties were fixed into sealed brick plugs and a stepped dpc extends from the wall membrane over bottom course with weep holes to allow the ground water to drain through the leaf without wetting it. The block walls to the left are the new, with the extended dpc at the bottom and cavity drain membrane seen vertically waiting to be linked to more membrane and block work later at the right. |
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The stepped dpc and weep holes in course below. One of two sumps partly excavated. We have a saying, 'Go Back To The Future with WaterGuard' |
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Headroom allowed Trace to form a sacrificial screed over the slab, in which cahes for the WaterGuard Basement Water Control Channels were installed, including cross floor because of the size of the footprint. This photo shows a TripleSafe sump that now includes two mains powered and a battery backup pump, one of two sumps present. |
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A cavity drain dpm was laid and sealed over and to the stepped dpc to link to the membrane in the cavity. |
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The system being installed was forming a drained cavity via the membranes at the ground retaining walls and the slab, with the secret drainage below However, because the internal walls were either structural and breached the slab or sat upon it, they would remain subject to ground water, so we fully lined to design out ’rising dampness, this using a combination of meshed membranes to be direct plastered where space was limited (stairwell), and battened and plaster boarded membranes. |
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Service ports were included to gain access to the WaterGuard, extended to later allow for the proposed screed. |
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