Decoupling Membrane Under Bathtub

[nikname]

I intend on using a decoupling membrane (eg Schluter or similar) for the tile floor in a small bathroom and thought about running under the bathtub. Although not conventional, is there any reason NOT to put the uncoupling membrane across the entire floor, specifically under the bath tub?

To quench all fears...I will not put tile or heating cable under the tub!

 

[Sylvan]

Should not be a problem

 

[Sponsor]

 

[Reach4]

I don't have an answer for your direct question, but sometimes mortar is placed over and/or under plastic. Mortar does not need air to harden, and in fact it hardens better if it stays moist longer. I suggest you look through these:

https://terrylove.com/forums/index.php?threads/voids-in-mortar-under-acrylic-tub.82597/

https://terrylove.com/forums/index.php?threads/how-to-get-mortar-under-bathtub-in-alcove.88627/

https://terrylove.com/forums/index.php?threads/first-tub-install-please-help.84586/

 

[nikname]

Should not be a problem

Thanks Sylvan!

 

[Jadnashua]

I would want to ensure that you've either prefilled the pockets in the Ditra, or were using some mortar to ensure the tub was level and supported...without those pockets being filled, setting the tub down onto that membrane would mean it was just resting on the top of the plastic grid with just air underneath...IOW, the tub would move as you added weight (person, or filling it with water).

 

[Sylvan]

When in doubt call the company

https://www.schluter.com/schluter-us/en_US/Membranes/Uncoupling-(DITRA)/c/M-U