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Webbing in rendered wall

  • 29-10-2012 9:23am
    #1
    FLCP
    Registered Users, Registered Users 2 Posts: 49 ✭


    Morning,
    Does anyone have any suggestions as to what might be behind this pattern in the render on an East facing wall? Its a relatively sheltered site, away from the coast and this only happens on certain (not all) wet days. The render has been on for about a year now.
    Any insights appreciated.
    Thanks,
    FLCP
    renderb.jpg

    Uploaded with ImageShack.us


Comments

  • #2
    PaleRider
    Registered Users, Registered Users 2 Posts: 155 ✭✭PaleRider


    This cracking results when an excessive amount of water is lost from the plaster - work after application. This could have been caused by poor preparation. Water needs to be applied to the background prior to application of render.

    While grinning may look odd, it is unlikely to lead to further cracking.

    However the application of an undercoat or a spatter-dash coat with water proofing added. in the weeks before plastering helps to avoid grinning.
    Poor sand also along with poor technique in the application does not help.

    It could be any number of reasons - but water - or the lack of it in this case along with rapid drying out needs to be controlled on the day of the final coating of render. The day of this work was it very warm - sunny?

    You could decide to paint. I believe from your picture this plaster finish is called nap finish. I think just paint with a weathershild and see how it goes.

    But do get advice from original plastering contractor - or other suitable professional. I don't know if the house is new our this is a refurbished house? This is important. Regards


  • #3
    FLCP
    Registered Users, Registered Users 2 Posts: 49 ✭FLCP


    Many thanks for the reply.
    The house is new (in a year, so walls up since May 2011, plastered in or around September).
    The plasterer and builder have been back and both are willing to stand over what's been done and replace if required, so that's something. The wall itself seems structurally sound, and the bond between the plaster and wall seems solid too - no hollow sounds when tapped with a hammer.
    Proposed solution is to paint one affected section as a test and see how we go, with a view to more drastic action if that doesn't fix it.
    The affected walls are both gable ends, facing East. I have no idea what the weather was doing on the day of the job, but it could easily have been hot with a breeze from the East that could dry these walls quicker that the rest. The workmanship on the rest of the job doesn't seem to be in question, so I am hoping the sealing/painting is a permanent fix.
    Any other thoughts would be appreciated, it did seem strange to us that just two walls are affected but weather could be the cause.
    Thanks,
    FLCP


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