Hire the best Waterproofing Expert

Waterproofing product compatibility advice for retaining wall

Results 1 to 2 of 2
  1. #1
    Registered User
    Join Date
    May 2015
    Location
    Sydney
    Posts
    1

    Default Waterproofing product compatibility advice for retaining wall

    Long story, have paid a fortune to have back fill dug up and retaining wall sealed and waterproofed (besser block)

    We used a commercial product (HPMA Sealtite AR) from Aldridge which is a PU membrane and the equivalent primer underneath.

    For a small section the landscaper for the second coat stupidly used a Water based product on top of the PU membrane. Donít know what the product was but could find out. Assume a basic bitumen WB from Bunnings.

    This section has never quite dried and is almost like an oily/tacky/tar sitting on surface of membrane.


    Is there a simple way/chemical to almost dissolve the WB product? I dont know which product it is but could find out.

    Given its a small section externally with one thick coat already on of PU plus plenty of drainage should I even bother?

    Also one more Q.... Is there something I can use to remove dried WB bitumen product off render? careless trades needing to be supervised like small children unfortunately,

  2. #2
    Golden Member
    Join Date
    Oct 2017
    Location
    Melbourne - Yarra Ranges
    Posts
    927

    Default

    Quote Originally Posted by bcr83 View Post
    For a small section the landscaper for the second coat stupidly used a Water based product on top of the PU membrane. This section has never quite dried and is almost like an oily/tacky/tar sitting on surface of membrane.

    A few issues here:
    1: What's the manufactures recommended coating? ie: 1, 2 or more coats? usually there will be fine print on the minimum thickness rathe then coats.
    2. For the small section that used a different product, is it compatible with the original product based on the manufacture's recommendations? Given it's gone tacky, it would indicate there is an adverse reaction between the 2 products and therefore has compromised the waterproofing membrane. The only solution "appears" that you would need to remove that section of membrane completely back to the sub-straight. Check with the manufacture what the requirements are for patching...would assume its primer again followed by the recommended liquid membrane...but do check what the manufacture requirements are.


    In terms of removing it, not sure but would start by scraping off the sticky areas with a metal scraper.
    I'd be very careful about applying any other liquid solution to assist in the removal it as it may affect the original membrane over a wider area particularly if it is absorbed by the Besser block and travel beneath the good part of the membrane.
    Other than that, unless others have experience with this I'm running into a similar situation with a shower (removing the liquid membrane back to the original substrate) and its just been trial and error to see what mechanical solutions work - grinder/wire brush, heat gun/scraper/grinder, small jack hammer drill to chip it off followed by a multitool with a 1/2 circle grout attachment, concrete grinder attachment in a grinder. The last 3 options seems to be successful in that order.

    Make sure you wear PPE including glasses/mask

Similar Threads

  1. Replies: 4
    Last Post: 3rd May 2022, 08:30 PM
  2. Replies: 7
    Last Post: 12th Sep 2021, 02:30 PM
  3. New Retaining wall product
    By mainly-outside in forum Retaining Walls
    Replies: 2
    Last Post: 3rd Dec 2012, 11:16 AM
  4. Name of Retaining Wall product?? Anyone know??
    By scoobysteve in forum Tools & Products
    Replies: 4
    Last Post: 18th Feb 2009, 10:23 AM
  5. Name of Retaining Wall product?? Anyone know??
    By scoobysteve in forum General Odds & Sods
    Replies: 4
    Last Post: 18th Feb 2009, 10:23 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •