Exposed gap between brick rows

Discussion in 'Misc DIY' started by jamesbget, May 23, 2008.

  1. jamesbget

    jamesbget Guest

    This is probably quite common but just want to know from others as
    never come across this before:
    damp has penetrated from the outside under the supporting stone of a
    bay window (edwardian terraced) - have removed plaster inside to
    expose brick in doing so i notice there is a 3cm air gap between two
    brick layers what was there in some places is some kind of ash, this
    is easily removed and now exists an air gap right to the outside and
    this is all away along on the same line around the bay window

    what should i fill this with any suggestions?

    thanks James
     
    jamesbget, May 23, 2008
    #1
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  2. jamesbget

    meow2222 Guest

    Either lime mortar or 1:1:6.
    Lime mortar is 3:1 sand to lime (by volume)
    1:1:6 cement:lime:sand, again by volume


    NT
     
    meow2222, May 23, 2008
    #2
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  3. "Stone" window sills in edwardian houses are quite often actually
    rendered bricks (cement, not lime). Keep an eye out for cracks in
    the render which can cause the effect you're seeing (and eventually
    the render will break off by frost action once water gets in).
    Also check the drip channel on the underneath hasn't been blocked
    with excess coats of paint, allowing water to run back under the
    sill. The render coat under the window frame may not be very
    waterproof (original window frames were often deliberately put in
    place before the render set in order to make a good seal, but any
    replacement PVC windows which could be leaking water from the
    frames might well leak through the render).
     
    Andrew Gabriel, May 24, 2008
    #3
  4. jamesbget

    jamesbget Guest

     
    jamesbget, May 24, 2008
    #4
  5. jamesbget

    jamesbget Guest

    the problem its not under the window pane itself but the supporting
    stone/cement block which was had mortar originally with carbon and
    ash to the brick bellow removing this layer has exposed a gap of 3cm
    all the way round the bay - hoping that the window is still supported
    by the two ends - will render as advised and seal properly checking
    that channel as you have advised - thanks
     
    jamesbget, May 24, 2008
    #5
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