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Old 03-03-2010, 07:06 PM  
rowdy48
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Default improper whirlpool tub install

I'm trying to repair the seam between a whirlpool tube and the cultured marble wall. I think the floor joist under the tub were not spaced correctly for a large fiberglass whirlpool tub. I'm guessing that with about 20 gals of water ( 160 lbs ) and an adult male ( 210 lbs ) is adding so much weight that the tub is sagging away from the wall and pulling the caulk loose. This creates a leak to the kitchen ceiling. I haven't ran a string across the ceiling downstairs but I'm sure its sags from the weight and the dissection of the floor joist done buy the plumber that installed the drain. I used bags of sand to weight down the tub today and used silicone caulk generously in the void. When it dries I'll remove the 350 lbs of sand and see if the seal holds when the tub is used. Ultimately I know that dropping the kitchen ceiling and doubling the joist will stop the sag but what is the proper way to seal the walls to the tub. Before I caulked today I could see the bare studs and fiberglass insulation through the crack between the wall and tub. It sags about 3/16 to 1/4 inches with the weight. Shouldn't there be some type of waterproof membrane at this point just like you use behind tile ? I'm familiar with the lip of a steel tub that the wall can overlap but this fiberglass unit doesn't have that.

Thanks for any thoughts.



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Old 03-04-2010, 06:45 PM  
Bud Cline
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First you must determine if the floor is sagging or the tub is flexing.

I gotta tell you my friend (and don't take this personally) there are some real cheesy tubs on the market these days being sold at home centers. You get what you pay for in acrylic tubs and even then the quality control is sometimes lacking in some areas. I have seen top-o-the-line Kohler tubs with the top flange so far out of wack they should be ashamed it ever went to market.

The cheaper tubs (not Kohler) flex considerably under the stresses of water and occupant weight.. This causes the lips/flanges to move as you describe.

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