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Thread: Rockcote Crack repairs

  1. #1
    Member mikee's Avatar
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    Rockcote Crack repairs

    Have a large crack which I have been siliconing up for last couple ((truthfully about 4 or 5) years.
    Anyone out there tell me what I should be using to repair it so I can paint over it. Mr Google does not say much about rockcote repairs

    Crack is too big for resene brush-able crack filler

  2. #2
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    Tried Mr YouTube?

  3. #3
    Member mikee's Avatar
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    Quote Originally Posted by 223nut View Post
    Tried Mr YouTube?
    Nope I know the HOW its just the WHAT WITH that has me f$^ked. Sillycone is not doing it really just a patch on a patch

    For the record I hate rockcote but not enough to get another mortgage

  4. #4
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    Have you tried a plaster bandage?

  5. #5
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    what about two pot

  6. #6
    308
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    Sika non-shrink grout, mix up to a paste

    Waterblast the crack out and let it dry first; may need a concrete primer which is usually a white milky watery substance

    Never use Selleys products for anything you expect to last
    stingray and Maca49 like this.

  7. #7
    308
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    Norsk 2-pot for a small crack

  8. #8
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    MS sealant, you might need to grind the crack open a bit, then apply the sealant. If you use a wet sponge and dab it on the sealant it should make it look like the plaster finish. then apply a GOOD paint.
    mikee likes this.

  9. #9
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    you need to grind the crack back, and back to a point where you can tell water hasnt got into it and discoloured it
    the grind should be web shaped i.e wider on the outside than the inner. at this stage i sure as hell would inspect the plywood under the crack because if its rotted and discoloured your problems start now!
    next thing to check is how thick the render is, i was at a jobsite and it was the apprentice job to cut down the thickness tabs ( little L shaped spacers) so the tradesman could use less render!
    ok, all going well "rockcote" is a bloody cheap product so go buy some, but as with all building its the prep thats the main thing. skimp on the prep and expect the worst, render will disguise all sorts of structural issues before it show on the outside of the building.

  10. #10
    Member Bonecrusher's Avatar
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    Cut a construction joint in there kill two birds with one stone

    Name:  movement_joint.jpg
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