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Waterproof sealant between concrete and metal

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  1. #1
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    Default Waterproof sealant between concrete and metal

    Hi everyone, I just moved to a new house, there is a shed in the backyard sitting on a concrete surface but when it's raining the floor is always wet. Is there a gap filler/sealant to prevent water from infiltrate between concrete floor and shed wall?
    Thank you!

  2. #2
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    Quote Originally Posted by Jacobb9o View Post
    Hi everyone, I just moved to a new house, there is a shed in the backyard sitting on a concrete surface but when it's raining the floor is always wet. Is there a gap filler/sealant to prevent water from infiltrate between concrete floor and shed wall?
    Thank you!

    Pictures will save you a thousand words.
    Water should not penetrate if built correctly, once we see the issue there maybe some suggestions.

    In the interim I suggest it has not been built correctly. Sorry to say a filler / sealant is not a long term solution.

  3. #3
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    20230122_174100.jpg
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  4. #4
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    The slab should have been poured with a rebate at the edge for the shed wall to sit in.
    https://gardenstar.com.au/wp-content...GARDENSTAR.pdf

    The best option now is to get a flashing that turns up inside the shed walls and turns down over the edge of the slab.
    https://www.renovateforum.com/f83/se...b-water-61856/

    Using a sealer may hold out water for a time but is likely to fail in the future.

  5. #5
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    As above, not ideal but you are stuck with it.
    You are not going to change the slab so something like a T Rex or Sika product will go a long way to seal the aly to the concrete.
    Talk to the suppliers about which one.
    Not sure what you will do at the doorway though.
    Wire brush the concrete first.

  6. #6
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    Depending on how big your shed is, you will get better value out of a sausage tube/gun.

    Cut the nozzle on an angle (go easy on how big the hole is as you can always cut more if need be. You will work out if you dray it or push it. If the latter, you will find it pushes more under the ally angle for a better seal. Can get in a range of colors but suggest grey would be good. This stuff sticks like s$%t to a blanket!!

    Depending on your skill level, you could mask it but if you can work out a nice trigger pressure to speed ratios and push it along for a nice, neat finish with minimal clean up. Not sure how big the angle is, but you may need to do it from both sides....gently on the 2nd side so you not blowing it out.

    Sika 600ml Concrete Grey Sikaflex Pro+ Polyurethane Sealant - Bunnings Australia

    Paint Partner Aluminium Caulking Gun - Bunnings Australia

  7. #7
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    I'd be tempted to get some larger thin galv angle, apply bead of sealer to the bottom, then push that down to the concrete with the bottom of the "L" under the existing and pop or screw to the existing angle..That way you're not relying on the sealer to bridge a big gap..
    And.....your point is.....what exactly?

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