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Coating to stop rain penetration

  • 18-05-2021 2:03pm
    #1
    cronley
    Registered Users Posts: 41 ✭


    I would appreciate if you could help me.
    We have a two storey house with a south west facing exposed gable end. During heavy rain and strong wind, the wind drives the rain through the render, and appears as damp on the inside. The wall is single leaf cavity block, rendered on the outside with sand/cement plaster and pebbledash. It was constructed about 1975. It has been painted over the years, and was painted August 2020 with Dulux Weathershield, but it did not stop the rain penetration.
    Can you recommend a coating to stop rain penetration.
    Is it suitable for pebbledash.
    Will it stick to Dulux Weathershield exterior masonry paint.
    Can it be painted over, in years to come, with exterior masonry paint.


Comments

  • #2
    newirishman
    Registered Users Posts: 270 ✭✭newirishman


    Had a similar issue, it stopped after adding external insulation - this is of course not a cheap option.
    Painting pebbledash is also not easy, so unless you are very diligent with applying paint (and a lot of it) you might not get a water tight surface.

    In my (not professional!) opinion unless you either apply external insulation or at least get rid of the pebbledash and re-render properly anything will just be a half fix.

    Of course, it might be that your gable end is not water tight and doing something with the roof line will help.


  • #3
    yop
    Moderators, Home & Garden Moderators, Regional Midwest Moderators, Regional West Moderators Posts: 16,722 Mod ✭✭✭✭yop


    cronley wrote: »
    I would appreciate if you could help me.
    We have a two storey house with a south west facing exposed gable end. During heavy rain and strong wind, the wind drives the rain through the render, and appears as damp on the inside. The wall is single leaf cavity block, rendered on the outside with sand/cement plaster and pebbledash. It was constructed about 1975. It has been painted over the years, and was painted August 2020 with Dulux Weathershield, but it did not stop the rain penetration.
    Can you recommend a coating to stop rain penetration.
    Is it suitable for pebbledash.
    Will it stick to Dulux Weathershield exterior masonry paint.
    Can it be painted over, in years to come, with exterior masonry paint.

    Living on the West coast we get hammered with the weather. I always mix in PVA bonding in the paint and it forms a plastizer in the paint on the walls.
    Though I'd wonder even with a single leaf if that would solve your problem.


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