Inherited a bathroom project. Basement, slab floor, shower pan installed (32in x 32 in) already installed but on a slope. It is about 3\8 in. out of level. My odc prevents me from not correcting this even though it does drain. Three options.
1. Pull pan and level concrete slab.
2. Pull pan and carve away on fiberglass ribs.
3. Pull pan and shim (possibly roof shingles) floor.
All advice appreciated. Note: There is no shower stall yet. Just pan with surrounding studs. Pan has not been affixed to studs.
Get the pan level and fasten it securely. Prevent bending or breaking
by filling the space under it with something reasonably solid. Shims
would leave gaps into which the heels of the average adult human would
push the pan's material.
Your dimensions work out to 192 cubic inches, or a little over a tenth
of a cubic foot. Volume of five or six caulking gun tubes. RTV should
be solid enough if surrounded so it can't bulge out. Harder substances
preferred. But you'll need tubes to squirt it farthest from the
opening, so you don't trap air behind it.
Or carefully mix 192 cubic inches of filler, pour it in, then push the
pan into it. Push a little at a time so as to get it level. Let the
stuff harden, then remove any leakage. (Most of which will squeeze into
the raised border of the pan.)
I had a shower pan that rocked (wiggled) back and forth as you stepped on
it. What I did--got the base level and then sprayed underneath it with foam
(from a can, similar to what is used around electrical boxes etc). It
expanded completely filling the space under the base and then oozed out of
the base. When it hardened I just trimmed all the stuff outside of the
base. Worked great, base solid as a rock.
A variation on Option 1, unless this is what you meant by "level concrete
Pour a bed of mortar and press the pan into it, making it level. Use enough
mortar to fill the voids below the pan and make it feel very solid. If
you've ever stepped into a fiberglass shower or tub with voids underneath
and felt the give, you'll know what you are trying to avoid.
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