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Shower base We installed a one piece shower base, but later discovered there is some flex around the outside perimeter of it. Is there anyway to shim or reinforce this without starting over?

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Sorry to say. the answer is no.
since it is a one piece. the only way for you enforced the tub is from under neath, which is from the inside.

Posted on Nov 18, 2008


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How to reinforce a flexing fiberglass shower floor

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We have had our shower for 5 years now and it continues to leak at the bottom corners. we have the corner shower stall against a tile wall. I have replaced caulking several times even removing stiles...

You need the base taking out and installing properly.

If must be on a firm surface with no movement up, down, backwards or forwards. The best way is to glue it with a bed of expanded polystyrene so it can't move. Then you need a tile to shower edge filler which overlaps the base. Fill the gap with silicone, between the base and shower and when it is dry, put the edging piece on bedded into silicone. Then tile over the upper part of the edging.

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Hi seawitch678,

If you have a granite or stone countertop/sink, use silicone as plumber's putty will stain the stone. Plumber's putty is petroleum based so it will not adhere to stone. Normally you should use what the manufacturer recommends and where they recommend. When installing a faucet, put either around the base of any piece that goes through the countertop.

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Some years ago I purchased and installed a MAAX shower stall. After installation, it developed squeeks in the floor. I have identified that the squeeks are eminating from the aspenite that was attached to...

Hello. When you say basement side, I assume you are referring to the underneath. There are a number of options available, all hinge on the conditions you have.

1) Plenty Of Room: The best scenario. You can install a solid cross brace (preferably the same material as your joists) across spanning from one joist to another under the seam. Nail (best method - due to ability to handle potential shear stresses) cross brace in as secure as possible to the floor boards. Once that is done, lightly drive in a shim or two coated both sides with a little (this stuff goes a long way!) construction adhesive.

2) Same as Above, But Pipes Run Through: Either use a solid cross brace that will fit (ie 2x3) and treat the same as above, or use the 2x2 method where they are installed diagonally, but directly underneath the seam and shim. This should remove most of the squeak.

3) Not So Much Room, But Still Workable: (ie no pipes but limited access) Build an "H" frame that will span between joists, and the cross piece will do the same as #1. Secure in any manner you can, but ensure that it is secure on both sides of each support. Then shim and glue.

4) Can't Cross Brace: Not the greatest solution, but sometimes necessary. This one depends solely on the knowledge you have of the materials used... specifically their thickness'. Cut a piece of 5/8 inch (3/4 inch is better) plywood that will fit into the beam spaces under the seam. Be sure that they span about 6 to 8 inch on either side of the seam using screws (prefferably the kind meant for wet applications). NOTE: some shower bases are installed on a concrete/thin-set curb, this means that the screws must not penetrate the sub floor OSB. So, if your flooring material is only 5/8 inch, your overall screw length should not exceed 5/8 plus material used. (ie 5/8 + 5/8 is 1 and 1/4 inch maximum. Ideally 1 inch only) After all we only want the screws to hold. Before securing the brace, spread a good construction adhesive on it (I am a big fan of PL Premium).

If you are referring to the other side of a wall, and the shower is on the lowest level, there isn't much available in my experience. I have seen some similar issues involve: removing the silicone around the base and securing that. This involves drilling some of the material out on one side of the seam, filling with a two part epoxy, using heavy weights to secure the floor down, and shaping the epoxy smooth so the caulking will cover. This never does the job completely as access to the seam is limited.

These methods are a few suggestions that should help the issue. If they help out, please rate this answer a four thumbs-up. Thank you and good luck.

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There are two ways that I would do it depending on the width of the ledge on top of shower base. If you have enouch room I would shim studs with strips of material thick enough to bring the surface out even with flange on shower base. Then I would put cement board(wonder board) on wall and over shower flange to set on top of shower base. Finish seams on wall board per manufacturers directions,Let seam filler dry then seal with thompsons water seal or equivalent sealer. Let that dry then tile on that grouting and sealing with quality caulk at joint between shower base and tile.
If ledge on shower base is not wide enough then I would place cement board directly to studs then use filler strips on face of shower base flange to bring two surfaces flush. Water seal let dry and tile again coming down over top of shower. Grout and caulk to finish. P.S. I would use a siliconized latex emulsifier to mix in with grout. It gives a better ware proof seal. Hope this helps you. Good luck and thank you.

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I have just had a new shower enclosure fitted which has has to be built up off the floor to allow for drainage. This has left a 3" gap along the bottom from floor to shower base. Where can I get a piece of...

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