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block built shed water ingress

Discussion in 'Building' started by cornishsteve333, 12 Nov 2017.

  1. cornishsteve333

    cornishsteve333

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    Hi all I have a damp issue with my block built shed

    in a space at the bottom of my garden I have a block retaining wall 1m high. it is 1 block longways wide built on concrete footings with a purforated drain pipe in behind.

    I decided to build a block shed building of the retaining wall for 2 sides of the shed.

    So I:
    • had the floor concreted (4inch thick)
    • built the walls of the shed using blocks on there edge
    • fitted a fiber glass roof, clad walls with larch, fit doors, insulated the roof etc.
    • tanked interior walls using kb to 1m (following the instructions).
    • there was a considerable ammount of condensation but I was happy the wall was water. tight so I rendered using waterproofer in the render.
    after a week and happy it was dry I started to paint the interior then this morning I woke to find water penetration in multiple locations.

    So it appears the tanking has failed.

    can anybody suggest any ways I could fix this without removeing all of the render and re tanking.
     
  2. John D v2.0

    John D v2.0

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    Not sure how tanking works on the inside of a wall, presumably the drainage is supposed to keep the water at bay? but how about building a drained cavity and then having a dry inside leaf? Then there won't be any water pressure on your internal wall coverings.
     
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  4. ^woody^

    ^woody^

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    I'm struggling to visualise the tanking and the rendering, with the new and retaining walls and where the failure is. It might not have been a good idea to tank and render.
     
  5. cornishsteve333

    cornishsteve333

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    Hi woody, so the block walls make up the 1st metre of 2 of the walls then using wall ties I built the other 2 walls from the base of the concrete pad, it is at this height where the issue is (although I have built another 1m on all 4 sides).

    I then preped and tanked the interior on all 4 sides, and then rendered ontop of the tanking.

    the failures are in a few places in that 0-1m section
     
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