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Thread: Waterproofing cement block

  1. #1
    Tosai
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    Dec 2009
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    Waterproofing cement block

    I have been reading a lot of posts on different products to waterproof cement block. Looking at epoxy coating from different suppiers. Are they really necassary? Some people say you can stucco the block. Didn't know it was waterproof? What is the cheapest solution?

    Thanks

  2. #2
    Oyagoi woodyaht's Avatar
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    Welcome to Bito,

    There's many options for coating block. Depending on how strong your wall ended up being, this might impact what you may want to use. If your wall is strong enough to survive a nuclear blast than Epoxy would work. The problem with Epoxy is it contains no strength. If your wall cracks the epoxy will crack as well as it doesn't have any elasticity, and it's brittle.

    Personally I'd fiberglass it and gelcoat it. But that's just me

    Lots of people will say to use Polyurea. Expensive though.

    I am drawing a blank on the rubberized coatings available for ponds (not enough coffee yet) Someone else should chime in shortly with those options for you.
    “If you tell a big enough lie and tell it frequently enough, it will be believed” Adolf Hitler


    Chris~

  3. #3
    Tosai
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    Dec 2009
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    Sorry the products I was looking at were from Sani-tred etc. Rubberized roll-on linings. Wouldn't fiberglass be $$ & hard to do? I've done a fiberglass canoe before. Basically use fiberglass cloth & resin right on the walls? Makes sense, never tried it.

  4. #4
    Oyagoi woodyaht's Avatar
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    Here's some links:

    Sanitred has had some problems, not very DIY friendly after reading this : Pond Peeling

    There's Xypex : Question for Luke: Did you use Xypex?

    Yep, just resin and fiberglass, and it needs a proper coating of gelcoat as a final coat to block UV damage to the polyester resin. If you've done it before, you have some kind of a grasp on what it takes. If you choose this route feel free to PM me and I can help you choose what you may need based on your pond size and such. It may be expnsive, but I don't know how it compares price wise to the rubberized coatings.

    I am working on getting polyester resin out of my blood stream after working with it for 20+yrs

    Someone else should be along to give you the pros and cons of the rubberized coatings.........

  5. #5
    Tosai
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    Dec 2009
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    After doing some research & looking at Luke's lake he built I'm going to try the Xypex. I found a local source here. Also spoke directly with a Xypex rep and we talked about what I want to do & he said things should work fine.

    Mike

  6. #6
    Oyagoi woodyaht's Avatar
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    Sounds like your on a good path!

    Post pics when you have time of your progress.

  7. #7
    Tosai
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    Dec 2009
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    I will. It's going to be a spring project. Have to wait until this snow goes away.

  8. #8
    Fry
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    Jan 2010
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    1

    concrete/masonry waterproof acrylic paint

    Hi,

    does anyone have experience using acrylic waterproof paint?

  9. #9
    Daihonmei PapaBear's Avatar
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    Oct 2005
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    Quote Originally Posted by f458 View Post
    Hi,

    does anyone have experience using acrylic waterproof paint?
    You'll have to be a lot more specific. Ordinary Acrylic paint won't cut it and "waterproof" does not necessarily mean suitable for immersion.

    If you are looking at acrylic products you need to investigate several things thoroughly.
    #1 Is the paint rated as "fish safe" or "food service" grade?
    #2 Is it designed/rated for "Continuous Immersion"?
    #3 Is it a "High Build Elastomeric" paint?

    If it misses on any of those counts keep on looking.

  10. #10
    Tosai
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    Dec 2009
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    Have my footings poured & going to block the wall this weekend. I'll post some pics of the progress.

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