Retro Fitting Movement Joints into Concrete Walls

Discussion in 'Building' started by self builder 123, 15 Jun 2009.

  1. self builder 123

    self builder 123

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    Hi

    We have been advised to have movement joints fitted into the walls on the house before it is rendered.

    The walls in question are over 6m in length. The house is a timber frame construction with a standard dense 7N/sq.mm concrete block outer leaf.

    I understand that there should be a movement joint every 6m along a straight wall and 3m from either an internal or external corner.

    The roughcaster is going to cut down half way through the blocks with a Sthil saw before fitting the movement joint and then rendering.

    I appreciate that the actual movement joint should have been a 10mm gap right through with frame ties either side in each course - not sure why the builder did not do this in the beginning ??

    The house has been built for several years and no cracks have appeared, however I like the idea being suggested by the roughcaster.

    I take it that there is no down side to this ?

    Comments please ! :D
     
  2. Shytalkz

    Shytalkz

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    Use expamet (riblath) and render onto that. Render directly to blockwork is always prone to cracking. No need to be titting about cutting joints then.
     
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  4. self builder 123

    self builder 123

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    Hi Shytalkz

    You mean use the rib lath to cover all of the concrete walls and then render onto that ?
     
  5. Shytalkz

    Shytalkz

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