running parallel to the 60" side of the shower. This would save me a 1/2" between the sub floor under the shower pan and the sub floor in the rest of the room which should allow me to have a flush floor transition where the tiles on the Schluter shower pan meet the tiles on the rest of the floor. Right now the entire bathroom has a 1/2" subfloor with some thick cement board on top (it looks 3/4"). Replace an unsound subfloor with 3/4-inch exterior plywood. Re: Shower pan over 2nd story wood subfloor install As Lavrans said, you really do need to get a good book or sub out your pans. ... including the subfloor, walls and the edge of the shower tray for proper support. Use a wide-blade putty knife or a paint scraping tool to peel off old caulking and adhesive. If a mortar bed is not installed with a shower pan that requires one--even with higher-quality pans--the shower pan will not be adequately supported underfoot. If it is not, mix Self Leveling Mortar and screed the floor level. Generally, you want something on the plywood to prevent it from sucking the moisture out of whatever you use to level the pan before it can cure (assuming it is a cement based product). Mark the outline of the shower pan on the subfloor using pencil or a chalk line. Option 2: add 1/2" plywood shimmed and screwed to joists. All the cement board will come out and be replaced with backer board. Draw the outline of the shower floor on the subfloor to use as a pattern for setting the mortar forms. I don’t understand your joke. This article provides detailed instructions for leveling a subfloor based … The subfloor is not level. Trugard TruSlope Shower Pan Kit is made of expanded polystyrene also know as high-density styrofoam. Cut about 5” - 6” hole in the sub floor … Plywood allows for a much better build-up with lower undulations in the subfloor.  Cement backerboard is made for tiling. Keep this as your project thread so we can keep up on the whole project along the way, pan, floor, etc. The subfloor is tong & Grove 3/4" osb with joists at 16"o.c. Cut pressure-treated bottom plates and pre-assemble the walls, centering the studs every 16 inches. I would never consider that as there are ways to avoid it, but removing (and/or recessing) the plywood subfloor does have an appeal. Entire bathroom is only 6' x 7'. Drive a nail into the floor every 8–12 inches (20–30 cm) so the tar paper stays in place. I haven't found much help or info on the subject. The room is new construction, with just studs and subfloor. My question is logistics of using these shims under a bathtub. If the floor is not level, use Thinset or another leveling mix as needed (let harden before setting the base). Picture of subfloor to clarify it is composed of planks with gaps. No I would not apply water proofer to the subfloor under the shower pan (unless we are going to be waterproofing the entire floor it might be easier to just continue it under the shower pan). CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity. Backerboard does not shrink or expand when it comes into … The floor is not level. Erect and brace the walls. It should be small enough to not interfere with wall material. Clear all debris and old adhesive from the surface. What you use depends somewhat on how far out of whack the floor is, and the construction of the base of the shower pan. Lay a large sheet of tar paper on the entire floor of your shower pan and smooth it out as flat as possible. In some cases a mortar bed is a necessity; other times it isn't.
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