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Unread 02-25-2018, 10:28 AM   #1
Chairandy
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Help with thickness calculations of bath tile floor....

Planning a tile install for a no barrier floor transition from shower to bath floor area. Shower will be mud and my estimate for height floor area is my concern... It will determine the perimeter height of shower area. (I plan on using a threshold to create a lip for water with elevation kept at a minimum My allowance for material includes:

A - 3/8 (glued and screwed) plywood on top of 3/4 sub floor on I truss 16 o.c. to get my minimum 1 1/8" total thickness throughout..

B Thinset allowance 3/16"

C Ditra heat mat 5/16"

D Tile 3/8"

The total elevation will be 1 17/32" I am going with 1 1/2 "

This height will determine the mud height at the perimeter of shower area. Shower will have a linear drain in center of a 40 X 48 shower area. Have I allowed the appropriate measurements for the area at entrance of shower?

Thanks for any input provided.
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Unread 02-25-2018, 01:18 PM   #2
jadnashua
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IF your 3/4" subflooring is in good shape and you're not going with a natural stone tile, you do not need additional ply. It's really hard to find 3/8" stuff that will lay flat, so if you do need a second layer, plan on 1/2" stuff. While laminating the two sheets together with glue is stronger, it's not easy, and is not what the conventional installation is or the analysis was based on. You must use a full-coverage wood glue, not a construction adhesive for that lamination or you'll have issues.

The thinset thickness will depend on the tile you use. It could be more, it could be less.

If you plan to carry the DitraHeat mat into the shower, you must cover it with Kerdi in the shower area, which would add a slight amount of height.
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Unread 02-25-2018, 07:17 PM   #3
Chairandy
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Thanks for the response. Regarding ply above the 3/4 t&g ( 16" o.c.) on the I trusses, I thought you need minimum thickness of 1 1/4" of plywood to satisfy minimum flex requirements. That is why I am considering adding 3/8" to get to 1 1/8" thickness. My other concern is threshold height at entrance to bath that will have 3/4 oak finish floor. Where can I get deflecto for I trusses? The deflecto I usually use does not include truss framing.
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Unread 02-25-2018, 07:22 PM   #4
jadnashua
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You said you were using Ditra? Download and read the installation manual. What is the spacing of the trusses? If no more than 19.2", 3/4" meets all of the industry standards of the TCNA and Schluter for ceramic tile.

The only one that can tell you the deflection of your trusses is the manufacturer. Generally, unless something greater is requested during the design phase, they are installed with L/480, but you won't know for sure until you call them and ask. There should be some markings on it to identify, or, if you have the blueprints, that will say.
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