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Gap filler cracking after six months.

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  1. #1
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    Default Gap filler cracking after six months.

    Team.

    Moved into a town house 6 months ago and the first thing I did was use either selleys or Bostic gap sealer
    on a small say 1mm or less gap on a brick common wall where it joins the cornice.
    I did not paint over it as it as it was white same colour as cornice.

    So six months later the gap has appeared again where the filler was put.

    So have I possibly used to much water in the cloth when I was wiping over it to smooth off and effected
    the strength or does this stuff require painting to protect it from moisture in the air or should I now be
    looking at a paintable silicon product.

    No other cracks through out only were the brick common wall is between the other town house, the other
    walls are all gyprock.

    Thanks all

    Neil.

  2. #2
    1K Club Member Master Splinter's Avatar
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    Default

    Your problem is not enough crack to fill.

    If your crack was 1mm when filled, and your caulk has 10% elasticity, then if your crack grows by a further 0.2mm it is exceeding the stretching capacity of the caulk by 100%. Even a polyurethane caulk can only cope with about 25% stretch...and 0.25mm is pretty small by most people's measures!
    DIY electrical wiring to AS/NZS3000 - details here - http://goo.gl/9d33T (PDF file)

  3. #3
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    Default

    Quote Originally Posted by Master Splinter View Post
    Your problem is not enough crack to fill.

    If your crack was 1mm when filled, and your caulk has 10% elasticity, then if your crack grows by a further 0.2mm it is exceeding the stretching capacity of the caulk by 100%. Even a polyurethane caulk can only cope with about 25% stretch...and 0.25mm is pretty small by most people's measures!
    Hmm Makes sense.
    So how do I overcome this , increase the crack ??

  4. #4
    1K Club Member Master Splinter's Avatar
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    Essentially, yes. However a 5mm or so line of caulk may be more noticeable than the crack. Can you hide the crack with an overlapping edge detail or something????
    DIY electrical wiring to AS/NZS3000 - details here - http://goo.gl/9d33T (PDF file)

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