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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Products: Waterproofing External Concrete Walls

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  1.  
    • CommentAuthorEshanessAl
    • CommentTimeJun 12th 2015
     
    Hi everyone. Hoping for some product recommendations. We have a mass concrete built house from the 60's in a VERY exposed location in Shetland. We knew there were damp problems, and water coming through chimneys but I recently stripped back some walls inside and realised just how wet they were.

    Basically even if there are no obvious cracks the water seems to be making its way through somehow. It's been 4 years since painting so that needs doing, but I'm wondering what is the best product to use?

    I've looked at a few other solutions like StormDry cream, or perhaps cheaper waterseal sprayed on then painted over. We may eventually clad the whole house but if there's a long term solution it would be nice to avoid this.

    The masonry is all in good condition and very strong - no render coming off or anything like that. There are some small cracks on the chimneys but they're not big enough to repair easily.

    Any experience of waterproofing solutions appreciated!
    •  
      CommentAuthordjh
    • CommentTimeJun 12th 2015
     
    If you waterproof the outside of your walls, you'll most likely find that doesn't cure the problem, because water also finds its way into walls from the inside as water vapour. Cladding the outside with a ventilation gap and drainage plane behind the cladding is likely to be the best solution.

    Having said that, I read recently of somebody who has clad the outside of a cottage on Dungeness in rubber! I have no idea whether it works, or if so how.
    • CommentAuthorEshanessAl
    • CommentTimeJun 12th 2015
     
    Thanks for that. If cladding is the best solution then we will likely use a cheap water seal and then paint for now, as the cladding is going to need saving up for!

    It was most certainly driving rain that was causing the issues I saw though, as it dried up 24hrs after the rain stopped! I guess the mass concrete (beach shingle type) has so many channels for water to permeate through.
    • CommentAuthorEshanessAl
    • CommentTimeJun 12th 2015
     
    This was the product that caught my eye as it supposedly maintains a degree of breathability... http://www.stormdry.com/
    •  
      CommentAuthordjh
    • CommentTimeJun 12th 2015
     
    Breathability is definitely a good idea. The product looks interesting though fairly expensive.

    I've been considering Ceresit CT 49 Silix XD Nano-silicone paint recently for a particular area.

    I don't know anything about any of these products and would love to hear anybody's experience as well.
  6.  
    Best thing by far is to EWI it and re-render on top, depending on your financial situation you may get significant grants. Many poured concrete houses here in the Western Isles been/being done, will sort out your problem once and for all. You will probably find that the "beach shingle" is interspersed with beach rocks of the largest possible variety as that meant less of the expensive cement powder going in:wink:

    Once your EWI then the temperature gradient of the whole wall changes, you should find that the wall will actually store a reasonable amount of heat as it will be kept warm and dry. The insulation will be doing all the work. Many silicone products out there to help shed the water, but they are all going to be short term and avoid the real issues.
    • CommentAuthorEshanessAl
    • CommentTimeJun 12th 2015
     
    I've just had the walls insulated inside with a grant, which is how I discovered how much water was coming through. 25 or 50mm EWI and render/cladding would be an option but not affordable at the moment. I doubt I'd get any more financial assistance for that, and anyway I'd rather do it myself and grants never seem to allow that.

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