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Preventing moisture seeping through to the wall

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  1. #1
    Apprentice (new member)
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    Default Preventing moisture seeping through to the wall

    It's been raining quite heavily in Sydney the last few days and when I went to the basement I noticed the wall was quite moist and water was coming through.

    basement-wall.jpg

    I believe the other side of the wall are front steps which are quite old. I suspect it's being caused by gaps between the wall and stairs and with some of the stairs as well. What would be my best course of action to try and plug the gaps? The wall is rendered but is starting to stain.

    stairs-wide-pic.jpg

    20211013_165111-min.jpg

    20211013_165127.jpg

  2. #2
    Seasoned DIY droog's Avatar
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    Best method would to be rip up all the concrete and dig down beside the wall to foundation level. Then install waterproofing that will stop the water getting to the bricks.
    Another option is to use one of the liquid injection systems into the wall from the inside but the best is to stop the water getting to the bricks in the first place.

    Gaps will not be the cause, they wont be helping but even sealing them will not prevent water getting to the bricks.

  3. #3
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    Thanks for the response Droog. I have some questions as I'm a newbie DIYer.

    As I'm inexperienced, ripping all the concrete and then waterproofing it would probably be something I would need to get someone to do for me. Should I be looking at getting a builder for this kind of job? And what kind of ball park figure would I need to consider? 5k? I would also need to factor in re-installation costs as well.

    I know you said sealing wouldn't help much, but if I was to investigate it further what kind of sealant should I be looking at?

  4. #4
    Seasoned DIY droog's Avatar
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    Well most of it is labour and excavation to get at the wall then a specialist waterproofer would be best to address the problem.
    I think 5k would go pretty quick, and you would need to look at the entire job, this is the second thread for damp in walls with backfill behind it. If you have an entire floor below ground it is not worth doing one small section and not the rest.

    Any flexible construction sealant that is designed for the surface material it is being applied to, I usually look at the Sika brand but there are lots of other brands regularly used.

  5. #5
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    Yeah I think getting to the root of the moisture and addressing it will become a fairly expensive affair, so thinking of some shorter-term solutions to help me get by initially.

    Thanks again for your responses droog!

  6. #6
    Golden Member havabeer's Avatar
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    the cheapest and quickest "temporary" solution is going to be:

    degrease and Pressure wash clean the whole area
    scrape out the old silicon on the steps and wall
    get a big bucket of some exterior water proofing (like cromellins from the bunnings)
    get some of the corner fabric stuff for it as well.
    slap a few coats of it on the wall and stairs
    paint the stairs and wall so you don't have to look at the blue water proof colour
    pray it slows down/holds out for a few years.



    though your picture of the stairs isn't showing the entire area so who knows
    Remember if you don't sin, then Jesus died for nothing

  7. #7
    Old Chippy 6K
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    Quote Originally Posted by havabeer View Post
    the cheapest and quickest "temporary" solution is going to be:

    degrease and Pressure wash clean the whole area
    scrape out the old silicon on the steps and wall
    get a big bucket of some exterior water proofing (like cromellins from the bunnings)
    get some of the corner fabric stuff for it as well.
    slap a few coats of it on the wall and stairs
    paint the stairs and wall so you don't have to look at the blue water proof colour
    pray it slows down/holds out for a few years.



    though your picture of the stairs isn't showing the entire area so who knows


    It is very likely the gaps are the source of the EXCESS water not simple osmosis through the sandstone and bricks.
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

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