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Waterproofing of box gutter

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  1. #1
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    Default Waterproofing of box gutter

    Iíve had a waterproofing membrane applied to the box gutters on our roof which were leaking. It rained lightly on the night the membrane was applied which had a reaction to the moisture.



    They did come back out and rectify the membrane, but it only looks slightly better.


    Is this satisfactory or does it need to be rectified?
    Attached Thumbnails Attached Thumbnails 20190831_110300.jpg   20190905_072405.jpg   20190831_110352.jpg   20190905_072349.jpg   20190831_110505.jpg  

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  2. #2
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    Never seen that done before.. Box gutters are no different than normal gutters, just a bit crappier.. All that was needed would have been silicone along the joins.

  3. #3
    Member wspivak's Avatar
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    Which membrane did you use?
    The WaterStop Shop
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  4. #4
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    Default Waterproofing of box gutter

    I'm not sure which product they used. The quote only specified a non-porus primer, hybrid polymer modified PU sealant to the joints, and a UV stable moisture cured PU membrane.

  5. #5
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    Quote Originally Posted by kesawi View Post
    I'm not sure which product they used. The quote only specified a non-porus primer, hybrid polymer modified PU sealant to the joints, and a UV stable moisture cured PU membrane.
    Ok, it's difficult to be 100% certain without all the facts, however, a few things to consider.

    1. I've never come across a hybrid polymer modified PU sealant (MS or SMX polymer) which doesn't adversely affect solvent based PU membranes (ie stops them from curing properly) - this could be the reason for all that discolouration post rain?
    2. Solvent based PU membranes can't be classified as UV stable to my knowledge, however, they can be classified as UV resistant, meaning they will last longer, but will eventually wear away. This can be alleviated through the application of an aliphatic top-coat, which doesn't appear to have been done here.
    3. Based on the photos (especially one where tape is showing), it appears the application may have gone on a little thin
    4. The membrane has definitely been adversely affected by the rain - hard to say exactly what the long term affects of that would be though

    Hope that helps.
    The WaterStop Shop
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  6. #6
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    Found out the product was AIS liquid rubber which appears to be bitumen modified polymer rather than a PU membrane. This would be consistent with why the brown area is a little tacky and smells like bitumen.

  7. #7
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    Well that explains the bitumen type of discolouration. Still looks a little on the thin side in some spots though.
    The WaterStop Shop
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  8. #8
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    Default Waterproofing of box gutter

    They're coming back today to go over it with the high build version of the product.

  9. #9
    Member wspivak's Avatar
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    Good news then
    The WaterStop Shop
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