Replies

1. 
   CAGIV | Dec 01, 2006 05:06am | #1

   What type of tub is it?

   If it is Acrylic or fiberglass be sure to read the instructions, a Kohler tub we recently installed advised against allowing the lip to rest on the tub deck. 

   We use thinset under our drop in tubs.  Others use drywall mud, what I do not like about mud is that has a tendancy to shrink a bit as it dries as well as crack.

   Make sure to completly support the underside of the tub with the thinset.

   

2. 
   Shep | Dec 01, 2006 06:08am | #2

   I've used gypsolite for years under tubs of all kinds.

   Its fairly light weight, sets up pretty quickly ( so you can work in the tub), is cheaper than thin-set, easy to mix.

   I've used the expanding foam, too. But I prefer the gypsolite.

3. 
   Bowz | Dec 01, 2006 06:15am | #3

   Plumber that I use sets  tubs, and shower units in something they refer to as "gypsolite".

   Today they set a Lasco unit that had a thick plastic base already attached to it. I've never seen that before, and it didn't look like the plumbers had put anything under it. Maybe it was only because it was a larger whirlpool unit.

   Same deal though, DO NOT SET TUB ON THE LIP.

   Bowz

4. 
   andybuildz | Dec 01, 2006 06:31am | #4

   I've used a sandbox and I've used structolite under thin plastic below the bottom of the tub. I use the pastic in case one day someone wants to get the tub out the cement wont stick to the bottom of the tube.
   Ain't I thoughtful? lol

   http://www.youtube.com/watch?v=b2sCbO4Uvlg

   http://www.youtube.com/watch?v=U7wEctHyuc0&mode=related&search=

   http://www.youtube.com/watch?v=yV460jyubzI

   I have dreamt of an open world, borderless and wide... where the people move from place to place, and nobody's taking sides.. http://www.yusufislam.com

   http://WWW.CLIFFORDRENOVATIONS.COM                                   

    
5. 
   zak | Dec 01, 2006 06:42am | #5

   I've used standard mortar, probably would use structolite or gypsolite if it was readily available.  Mainly because it seems like it would be a better insulator for the tub.

   zak

   "When we build, let us think that we build forever.  Let it not be for present delight nor for present use alone." --John Ruskin

   "so it goes"

    

6. 
   davidmeiland | Dec 01, 2006 07:57am | #6

   I always use Structo-Lite plaster under tubs and shower bases. It has a nice fluffy texture that lets you really mush the unit down into it, and it is fairly adhesive so once you've done that the unit is set. It takes an hour or two to set up hard. It comes in 50-pound bags and I figure a bag will set 2-3 units, depending on size and what the bottom texture is like. You can order in a bag anywhere that sells USG materials.

7. 
   jet | Dec 01, 2006 02:33pm | #7

   Having used expanding foam once. Thank goodness it was on my own tub and not a clients.
   DO NOT USE foam. I filled the tub up half way with water first and the foam still lifted the tub. I was able to hide it well enough but if I had not put any water in the tub I can only wonder how far off level it would have gone.Go with the gypsolyte or straight cement sand mix.

   "No doubt exists that all women are crazy; it's only a question of degree." - W.C. Fields