We’re installing a very heavy tub, (3,000 lbs), on a slab. It’s going to be set up to the right finish height on secured pressure treated blocks, which will provide depth for radiant heat, stone, hooking up the drain, etc. I’m wondering what to use to pack under the tub between the pressure treat. Normally we set the tubs in mortar mix by dropping it in but since this one will already be in place I’m thinking maybe non-shrinking grout. Anyone with experience in this area have some input? Thanks.
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Replies
spray foam
spray foam
I think I'd go with A & B
I think I'd go with A & B expanding foam from a marine supply house. Mix, pour and POOF!
http://www.carbonfiberglass.com/Foam-Core/expanding-foam-ab-2-part-pour
I'm surprised that a 3000 pound tub requires any additional support. Are you sure that the manufacturer calls for some? In any case, I'd not use foam... why insulate from the radiant heat you installed under the tub?
Well, there's actually no radiant heat under the tub itself, just in the areas you walk on in the bathroom. The underside of the tub will be about four inches above the level of the existing slab, for reasons which are obvious when you see the setup. That's why I need something to fill the gap. Foam actually sounds like a pretty good idea.
Why do you need something to fill the gap? Is this for support, to keep the mice out, what?
It seems obvious to me that fully supporting a carved out boulder is the smart thing to do.
So what do the install instructions say you should use?
Installation instructions? Since when do custom pieces come with installation instructions?
So far you have not told us anything about this tub other than it's heavy. No clue as to the size, material, etc.
You must have missed the part about it being a carved out boulder, (granite). I can't imagine a typical tub coming in at 3,000 lbs. either.
It is and the foam wil insulate the tub from heat loss and the floor below from noise.
heat loss? There will be no heat to lose! Any hot water placed in a 3000 pound, room temperature stone will be instantly sucked into that stone. might look cool, but the only thing really cool will be all teh cool water in that tub..
Well, there's actually no radiant heat under the tub itself, just in the areas you walk on in the bathroom. The underside of the tub will be about four inches above the level of the existing slab, for reasons which are obvious when you see the setup. That's why I need something to fill the gap. Foam actually sounds like a pretty good idea.
I'd like to know the presumed purpose for putting anything under there.
Here's an approprite link , http://www.dummies.com/how-to/content/how-to-install-a-new-bathtub.html