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  1. #1
    Join Date
    Oct 2014
    Location
    Auckland
    Posts
    87

    Default Moisture ingress in below ground living area

    Hi all, I'm keen to know if any of you can recommend a course of action. My lounge is partially below grade and just recently I have noticed some softness in the gib in just two small areas (this is gib on battens lining the concrete block wall). Presumably the original sealant on the exterior concrete block walls is starting to fail (the dwelling is approx 40 years old). From what I understand the best approach is to excavate at the external wall and apply new sealant etc. The foundation is only one meter underground I think and the wall about eight meters long. Can anyone recommend a good company for this job and any idea of what sort of cost?

  2. #2

    Default

    if the ingress is islotated you might be able to waterproof from the inside ? Remove some gib carefully to see what you are dealing with

  3. #3
    Join Date
    Oct 2014
    Location
    Auckland
    Posts
    87

    Default

    Quote Originally Posted by John the builder View Post
    if the ingress is islotated you might be able to waterproof from the inside ? Remove some gib carefully to see what you are dealing with
    Thanks for your reply. There are three particular spots (approx palm sized) where the gib has been sort of bubbling/bulging slightly for a number of years but these were always solid when I pressed them. However last night I actually managed to make a persisting indentation with my thumb in each of those areas. All of the other random places that I have been prodding along the wall seem solid (and look normal too). So if I was to remove the gib and see, perhaps, a crack in that spot is that a good candidate for sealing from the inside?

  4. #4

    Default

    it is likely a leaks at the joint between wall and floor(or a block joint) rather than a crack. There are treatments that can work from the inside and can resist hydro-static water pressure or work to block the pathway for water.(talk to experts like Gunac waterproofing). coating whole of inside is best. If the problem is a general one then maybe excavation of exterior is the answer but more expensive because of the excavation and reinstatement required.

  5. #5
    Join Date
    Oct 2014
    Location
    Auckland
    Posts
    87

    Default

    Quote Originally Posted by John the builder View Post
    it is likely a leaks at the joint between wall and floor(or a block joint) rather than a crack. There are treatments that can work from the inside and can resist hydro-static water pressure or work to block the pathway for water.(talk to experts like Gunac waterproofing). coating whole of inside is best. If the problem is a general one then maybe excavation of exterior is the answer but more expensive because of the excavation and reinstatement required.
    Thanks for the recommendation I'll call Gunac today.

    Property Talkers, please relay any experiences you have had with the "seal from the inside" method.
    Last edited by Merlot Mike; 15-01-2019 at 02:20 PM.

  6. #6

    Default

    I had water ingress coming in through the area where the ground slab of concrete meets the block wall , when their was a heavy downpour water would seep through.
    I approached a number of tilers in the filed but there was only one with specialist knowledge that i ended up using. His name is Tony and he uses a special coating that is applied from the inside onto the breeze block or concrete . You can then put on tiles or in your case the Gib or ceiling battens.
    It seems to have fixed the problem as we have had several heavy downpours with no sign of water coming through.
    SURFACE TILING LTD
    M. +6421 1634304
    T. +649 533 5566
    http://surfacetiling.co.nz/


  7. #7

    Default

    tilers would appreciate these prducts but this waterproofing is a specialist trade and not all products are suitable for all situations.

  8. #8

    Default

    Quote Originally Posted by John the builder View Post
    tilers would appreciate these prducts but this waterproofing is a specialist trade and not all products are suitable for all situations.
    Yes very true. Most tilers i came across knew about waterproofing from the glazed portion of the tile so that water would not seep through but had little to no specialist knowledge of preventing water ingress by applying special hydrostatic solutions to internal block walls thereby preventing water seeping through an external wall that was hard up against soil.

  9. #9
    Join Date
    Oct 2014
    Location
    Auckland
    Posts
    87

    Default

    I'm reading mixed reports on the effectiveness of internal wall treatment. I'm thinking of taking the external excavation approach even though it's probably gonna be expensive.. I'm waiting nervously for the quotes to come in.

  10. #10

    Default

    internal is the cheap option. If it doesnt work then you still have plan B


 

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