Hire the best Waterproofing Expert

Waterproofing membrane didn't extend into the waste pipe

Results 1 to 4 of 4
  1. #1
    Apprentice (new member)
    Join Date
    Sep 2016

    Default Waterproofing membrane didn't extend into the waste pipe

    Hi Guys,

    My mother had a renovation for the bathroom one month ago. Today I found there is a leak from drain pipe of the shower when I was doing some work in the subfloor of her house. It seems that the leak came from the gap between the drain pipe and the PVC floor flange. She told me that the tradesman didn't extend the waterproofing membrane into the waste pipe. But he did apply the waterproofing membrane on the PVC floor flange though.

    My question is that:
    1) Can it be fixed by applying some waterproofing membrane in the gap between the drain pipe and the PVC floor flange?
    2) Would this failure cause the entire waterproofing fail in the future?


  2. #2
    Je pense, donc METRIX's Avatar
    Join Date
    Apr 2012
    Sydney North


    Hard to say if it's a plumber or waterproofing problem, Whoever oversaw the work, call them back to fix it, waterproofing has a 6 year warranty if done by a licensed contractor who issues a waterproofing certificate.

    Do you have any pictures of the problem.
    Mieux vaut prévenir que guérir

  3. #3
    Community Moderator phild01's Avatar
    Join Date
    Aug 2009
    Sydney, north


    Could that PVC floor flange you mention, be a puddle flange! Pics would help.

  4. #4
    Member wspivak's Avatar
    Join Date
    Mar 2014
    Oakleigh, VIC


    Hi Frank2000,

    The waterproofing generally isn't taken into the waste pipe, but terminates on the leak control flange. Sometimes people get over-zealous when waterproofing, however, in my experience, terminating the membrane into the waste pipe can often lead to another issue - namely preventing the leak control flange (aka puddle flange) from working as intended.

    The easiest way to check if it's a waterproofing or plumbing issue is to have someone pour a continous stream of water direct into the waste outlet while someone else stands in the sub-floor and observes if there is a leak there or not. If it's leaking, then it's 100% a plumbing issue - if it isn't then it's almost certainly a waterproofing issue.

    So to answer your questions:

    1. No - if it's a waterproofing issue, then it's more complicated than that.
    2. Hard to say, however, it is likely to create future issues.

    Hope that helps.
    The WaterStop Shop
    waterproofing supply professionals
    Oakleigh, VIC

Similar Threads

  1. Extend pipe from tap above ground
    By John9999 in forum Landscaping, Gardening & Outdoors
    Replies: 4
    Last Post: 9th Mar 2014, 05:52 PM
  2. Replies: 12
    Last Post: 2nd Jun 2013, 04:53 PM
  3. Replies: 23
    Last Post: 21st Nov 2011, 06:21 PM
  4. Replies: 2
    Last Post: 14th Jun 2010, 09:37 PM
  5. waterproofing membrane -which one?
    By joe bloggs in forum Plumbing
    Replies: 3
    Last Post: 1st Jul 2004, 07:53 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