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One piece fiberglass tub cracked in the middle of basin (4'' crack

Support under tub seems to have deteriorated so when you step on the bottom there is some give. This has developed a 4'' or so crack. Can I somehow open up the front of the tub and slide a support piece under it as a temporary fix. We have been talking about remodeling down the road so I am looking to get by for a while. Can I even get under buy accessing an opening from the side.

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The only sure fix is to drill holes in the bottom of the tub and shoot in a commerical grade low expanding foam to fill in the void. The foam you find a Lowes or Home Depot will not work as it is a high expanding foam and will ruin your tub. Call a reliable tub repair company experienced in this type of repair. It should not exceed 200.00 including rolling in a new floor.

Posted on Aug 20, 2009

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Our tub has a lip around the top of 3 sides. The tub was either set in a little crooked or the wall is crooked. The inside corner on the faucet end of the tub the concrete wallboard is recessed about 1/8...


  1. 1

    Cut the tip off the tube of caulk, and load the fresh tube into the caulking gun. Puncture the seal inside the tip of the tube using a nail, stiff wire or the special puncturing tool built onto many caulk guns.

  2. 2

    Insert backer rod into large openings. These foam strips are available in sizes ranging from 3/8 inch to over 1 inch, and should be perfect for most bathroom filler needs. For larger holes, consider using a foam spray filler, but be careful as the foam expands a great deal and could overflow onto your work area if too much is used.

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    Caulk the joints as you normally would. For large cracks, don't force your caulking into the crevice, but simply form a bead over the crack. Use multiple beads and a caulking tool or piece of scrap lumber to shape the caulk and remove excess.

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    Allow the caulk to dry for 4 to 6 hours. Using the tip of your utility knife, check that the caulk adhered to all edges and formed a seal. For really large cracks, it may be necessary to repeat the process.

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    When caulking open cracks, place a bead along each edge of the crack. Allow the caulk to set for 5 minutes, and apply a third bead over the first two. Use the damp sponge to shape and remove excess caulk.

Feb 04, 2011 | Bathtubs & Whirlpools

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Small crack in shower tray can i get a repair kit


Are you talking about the shower pan as in the part of the shower which you stand on? It is possible that you might be able to fiberglass the crack depending on the type of material which the shower pan (tray) is made of. Check with your local Home Depot for a fiberglass kit. Good Luck

Dec 02, 2010 | Bathtubs & Whirlpools

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I have a cracked and damaged area on the bottom of my fiberglass tub insert. Can I fix it myself? Where would I find the kit needed? Thanks.


My secondary bathtub is that way. I was told it was just a surface crack and wouldnt leak. It can be fixed with a fiberglass boat repair kit. However, it would not look very good. I took clear caulk and squirted into mine and it seems to be working fine. Once you put the caulk in rub it in with your fingertip and remove the excess.

May 06, 2010 | Bathtubs & Whirlpools

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Patch for tiny holes in fiberglass tub (8 yrs. old)


From my own experience I had a crack in mine. I sanded the area I wanted to patch. I bought a fiberglass repair kit from the hardware store. I mixed the hardener with the resin and applied it without the cloth. Make sure you have good ventilation and don't get it on your hands. After it dried I sanded it smooth it didn't look the best so I hit with a little spray paint. I have since replaced the tub but it held until I was ready to do that. A couple of years. Hey if this helps give me a vote please.

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Can bottom of bathtub collapse


The answer is yes.Most of your moble homes have poly or fiberglass tubs with litttle or no bracing under them and the floors are made out of a fiber type board. When they get wet they warp, crumble and fall apart, so if water has gotten under the tub there isn't much of a floor under it. But yes it can be repaired. She will have to remove the old tub and the wall board around it And probably have that portion of floor replaced.

Dec 02, 2009 | Bathtubs & Whirlpools

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We have Builders #6032 and it has small hairline cracks in tub bottom. Its starting to leak into our basement. What do we do to fix it?


alot of times if you call the tub builder they have service guys who will come and fix your tub. most tubs have a 3-8 year warrenty against defects so you could get the fix for free. if not you can always try and get fiberglass resin and mix a batch up and seal the cracks yourself

Aug 01, 2009 | Hydro Systems DUO6648GWP Designer Series...

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We have a large cultured marble soaker tub with two hairline cracks going out from the drain, 1 about 18'' & 2nd about 24'' resulting in the tub leaking. The Tub is on the 2nd. floor & is sunken...


Hi Garry,

I understand not wanting to cut out the ceiling. Cutting it out is the easy part...Putting it back and making it look good....that's the hard part.
Just a few thoughts: You may be able to apply a coating from your access hole. What comes to mind to me is a 2 part epoxey with a relatively long cure time, to give you time to apply it. This can actually be applied with a small, disposable roller (shur-line makes a small one with a tray, ~$2). I have used this method on projects with success. If additional strength is desired, you can apply fibreglass mesh into the worked area just as you get tacky. Let dry and recoat. This can go as many times as you need to to get adequate coverage.
That was solution #1. Here's another possibility. Since it is a cultured marble tub, you may be able to grind out the cracks, collect the residue, and make a surface patch with resin and ground marble dust. Additional material may come from areas that you can't see, or perhaps you may purchase a damaged piece from a hardware/plumbing supply type store. I'd experiment with this one on some scrap before I went to gluing mama's tub though!
That was #2. One more, and I'll leave you alone. It's possible that you can find a spray coating that will do the trick. Such a coating could be applied laproscopically, via several very small holes in the ceiling, which could be easily repaired after.
Just a few asides While these may fix your immediate problem, be sure to find out why the cracks are showing up. Either the drain was overtightened, the tub was not properly cast, or the drain piping is supporting too much weight. Anything that you can do to spread the load of the weight of the tub, the water and as many kids as you care to put in there will go a long way in preventing the situation from recurring. Well, brother, just some food for thought. Hope that it helps.
Best regards, and good luck! Hopefully a garden tub guru will have a magic bullet they'll share with you!
--W/D-- Please feel free to rate this solution! Thanks!

Jul 29, 2009 | Bathtubs & Whirlpools

1 Answer

My porcelain covered bathtub has tons of ''spider cracks'' all over


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there are no easy fix for this. you can get a tub insert from any of the home center. I can tell you what the price is, since I haven't done any home remodeling for 3 years. price change.

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