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I want to build this: http://www.mrmoneymustache.com/2012/12/21/how-to-make-a-relatively-sweet-shower-cheap/

and I'm building in my basement bathroom: on top of the foundation I have 2x4 (horizontal) making joists (space about 4-6" apart) and the 3/4 plywood to make the sub floor.

So my question: is 3/4'' sufficient?

Tester101
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cbrulak
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3 Answers3

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The 3/4 sub sub floor is sufficient.

I have some comments about Redguard on the shower floor.

While the product (and others like it) is rated for a directly-under-the-tile waterproofing, I have some cautions (directed at the installation in the DIY blog article) :

Be sure you do a minimum of 2 coats, at right angles (as recommended). Be sure you lightly hone the cement base with a rubbing block, for a bump-free surface, before coating. If you have any voids, fill them in with the thinset you will use, before coating (using a portland cement thinset, not a premixed mastic thinset)

Be aware that the unprotected Redguard IS NOT abrasion, scuff or scratch resistant. A dropped tool or tile will cut it. Be very careful walking and kneeling on it..

Consider using a sheet membrane product (Kerdi, NobleSeal TS) for the floor and using Redguard on the walls only. I would put the Redguard at least 4ft high on the walls or a foot higher than wherever the direct spray would hit the wall opposite the spray head (whichever is higher).

HerrBag
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Do not Red-Guard the entire Shower Floor. Leave approx: 1 foot perimeter around the drain without Red-Guard. If not, any water between the tile and Red Guard near the drain may sit there and develop mold. By Red Guarding the entire Shower Floor area, you run that risk. In My Opinion, of course.

This is providing you have a Membrane just above the leveling Mud layer.

ATI nsider
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Yes, 3/4 inch plywood (not particle board, MDX, or whatever) is a standard subfloor in quality construction.

wallyk
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