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Can Cement Board Be Used Between Subfloor and Bathtub?
From what I've read, cement board is placed between the plywood
underlayment and the floor tile in the bathroom. What is placed between the subfloor and the bathtub? |
#2
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Can Cement Board Be Used Between Subfloor and Bathtub?
Depends on the tub. if an acrylic tib they are sometimes set into mortar. It
creates a firm base and eliminates flex. The tub install instructions will guide you. RT*M "e patashnikov" wrote in message om... From what I've read, cement board is placed between the plywood underlayment and the floor tile in the bathroom. What is placed between the subfloor and the bathtub? |
#3
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Can Cement Board Be Used Between Subfloor and Bathtub?
Also cementboard. You take everything out of the room, screw down
good 3/4" ply, then apply flexbond mortar and screw down 1/2" cementboard on top of the plywood&mortar with cement screws (remember not to align the seams the same way you laid the plywood). Now your floor is all one level, and all cementboard. Place the tub on the floor with wood stringers on the wall(s), or whatever you prefer. Insulate the walls and staple 4 mil plastic to the shower/tub area studs. Some people use tar paper, like you use on a roof. Screw 1/2" cementboard to the shower/tub stud area, leaving 1/4" gap on top of the tub so it's not resting on it, and greenboard everywhere else in the room walls, including the ceiling. Fill the tub with water to weight it down and caulk the 1/4" gap you left between the cementboard and tub. Since a regular tub is 30" deep, I like to use cementboard at 36" deep and all go around the tub with cementboard/caulk, just in case water drips out of the shower area. Let it dry and drain the tub. Lay your floor tile, again leaving 1/4" space back from the tub and 1/4" above the tub when you do the walls too, just like you did the cementboard on the walls. Caulk that gap when you're done. Tubs move around -- you don't walk grout there. Remember, most steel tubs come with a "lip" around the three sidewalls. You want to put the cementboard and tile ON TOP of that lip so water rolls down INTO the tub, not behind it. Yes, the tile will be SLIGHTLY tilted out just above the tile if you do that. Don't worry about it. I like to lay floor tile first, so the wall tile ends up nearly resting on top of the floor tile (again, with a slight gap). That way, water rolls off the wall tile ONTO the floor tile, not behind it. The only other thing I worry about is the fact that 3/4" ply, plus 1/2" cementboard, brings my floor higher than it used to be. So, when I put the marble saddle in the door threshhold, someone could trip walking into the bathroom. You can get attractive wood step-up saddles, easily stained/poly'd to the color of the floor, however, and this works nicely in front of the marble saddle. I'm no expert, though. (e patashnikov) wrote in message . com... From what I've read, cement board is placed between the plywood underlayment and the floor tile in the bathroom. What is placed between the subfloor and the bathtub? |
#4
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Can Cement Board Be Used Between Subfloor and Bathtub?
Nothing. It sits right on top of the subfloor.
On 17 Jun 2004 20:28:07 -0700, (e patashnikov) wrote: From what I've read, cement board is placed between the plywood underlayment and the floor tile in the bathroom. What is placed between the subfloor and the bathtub? |
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