cavity drain system

  1. N

    Cavity drain cellar tanking - how to finish?

    Dear DIYnot, Longtime lurker; first time poster, so be gentle! We're currently having our cellar tanked with a cavity drain system (Wykamol). It's the full works: membrane on walls & floor, perforated channel around the outside, sump with twin pumps, and I think I understand how it all...
  2. R

    Building an extension against an existing garden retaining wall

    Hi I am planning on building a one storey extension to the rear of my garden flat which is on the ground floor of a victorian terrace house in london. There is an existing sunken patio to the rear of my flat and there is a 1.2m high retaining wall holding the raised garden. The extension I want...
    • Reclined Dude
    • Thread
    • cavity drain system extension gap to retaining wall and extension garden extension garden retaining wall patio extension retaining wall sunken patio tanking
    • Replies: 3
    • Forum: Building
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