Replies

1. 
   woodway | Apr 01, 2006 01:16am | #1

   I don't know what was mentioned in the previous post but we have been using a sheet mastic asphaltic material called BITUTHENE. It comes in various size rolls up to 36 inches wide and it looks like electrical tape on steroids. It's got a protective plastic film on one side, you pull off the film and this stuff sticks to just about anything and even better to itself. It's not cheap but once it's applied properly, water is not getting through regardless. Find out where local builders buy their stuff and that store, lumber yard or building supply, should have it. It takes a little forthought on how to apply in your situation but once in position we cover with lath wire(chicken wire) and apply mud base coat and apply tile over that.

   Your challenge is to cover the nich in the wall without creating bulges and still getting proper overlap and cover. A bucket of primer comes with it that once applied, makes this stuff stick to anything and I do mean anything.

2. 
   alrightythen | Apr 01, 2006 01:35am | #2

   funny that you bring this up...I'm working on my shower ..and was about to close up the shelf I had put in 'cuz now I'm worried about the water getting thru.

3. 
   Grott | Apr 01, 2006 03:21am | #3

   Redgaurd, brush on waterproofing and isolation membrane.

   Garett

4. 
   BillBrennen | Apr 01, 2006 06:21am | #4

   RedGard is the liquid stuff most here are familiar with. About $40 a gallon at the Borg. It is a real problem-solver product, and rated for use as a safe pan.

   Bill

1. 
   DougU | Apr 01, 2006 06:47am | #5

   Do you put that stuff on over the durock board?

   Doug

1. 
   BillBrennen | Apr 01, 2006 08:59am | #7

   Yes, I just did a shower with RedGard over Durock on the flat walls, and over a mud job on the curved walls. In a typical tub surround, applying RedGard over the CBU is an alternative means of preventing moisture migration that allows the tile/grout to dry faster because the CBU underneath isn't holding a reservoir of water. The CBU can be screwed direct to the studs, which allows any stray moisture to evaporate out the backside of the panels (assumes interior stud cavity walls).For a good job, you need to seam the CBU with mesh tape and thinset and let it dry before applying two coats of RedGard. Read and understand the directions before proceeding.Bill

2. 
   user-61008 | Apr 01, 2006 03:17pm | #8

   Thanks Bill. That's what I was referring to. Typically I like to seal those recessed cavities (which I hate) as water/moisture tends to collect and sit there. Since this stuff is a sealer, does it affect the bonding ability of the thinset? Generally I just tape the seams of the durock with mesh & thinset, but after reading previously about this stuff thought I'd give it a try on my current job

1. 
   BillBrennen | Apr 02, 2006 06:00am | #9

   Latex-modified thinset sticks just fine to RedGard, even on ceilings. It is good to fillet your corners with thinset before you start with the RedGard, since a rounded corner will be easier to seal. 1/4" fillet is plenty, just run a gloved finger down with mud after your tape coat is dry.Bill

5. 
   Mongo | Apr 01, 2006 07:09am | #6

   An alternate route would be Kerdi membrane.