aqua defense over mud pan
I have just had a mud pan over vinyl shower pan liner installed. My question is can I put AquaDefense on top of the mud under the tile? Will this cause some kind of problem. I want the shower to be water proof and also plan to do the joints and walls.
Thanks in advance for any hel
Aqua Defence over mud bed and liner "Belt and Suspenders"
Divisi you should call Mapei Techinical Support. They do recommend this approach. In fact they even taught it to us in a product training class we attended last year. I have not ever used this approach but it is one Mapei endorses.
Originally Posted by divisi
They called it a "Belt and Suspenders" approach. We quit Mapei's using Aqua Defence last summer after another "Blistering" issue during a flood test. I think I'm done with the liquid membranes and have been loving the Ardex product called 8+9 a lot.
Better than 8+9 are the sheet membranes.
Better: Kerdi DS
Best: Noble Seal TS or DalSeal TS
A lot depends on local support - what grout you choose and things like this. What grout are you using? Try and keep your setting materials in one family and always test them after you first ensure the product is fresh. Reading Mapei's date codes is tricky - you need to understand the system. I have it mapped out partially here.
Aqua defense over mud pan - yes or no?
Jim in this approach "Belt and Suspender" remember that the two layers are not completely sealed from each other. The weepholes of the drain allow the mud deck to further drain away moisture. I have never liked this approach and even went so far to ask the Brass of Mapei why they endorse it.
Originally Posted by jadnashua
In the big picture so many showers have no pre-slope and a Aqua Defence layer can only improve this system - if the liner was damaged like so many are by sub trades before the tile guy shows up it is a back up plan. No harm there.
Better to plan on a system that is topical to begin with. Mapei has a product called MapeBand Drain Flashing for tying into a clamping drain. I think this product is weak and prefer the Noble Company's NobleFlex Flashing to turn a regular drain into a topical system.
The best thing in my opinion would be to cut away the rubber liner from the clamping drain and use it soley as a slip joint. Go with the NobleFlex Falshing after the shower pan is installed is installed and re-flood test the shower. Use the 1.5" Noble flex Flashing as most times a 1.5" layer of deck mud is required over top a slip joint.
This way you do not need to tear out the whole system if you have a rubber liner and don't trust it. So many builders like to get the flood test over early so the old school approach of using a rubber liner is fast and cheap.