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Old 12-27-2011, 12:29 PM   #1
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Tub: Foam insulation instead of mortar bed?


Hello everyone!

I'm about to install a new bathtub, and I'm thinking of using foam insulation instead of a mortar bed to support the bottom of the tub, to keep the water warmer for a longer time. I would do this after the tub is nailed down and filled with water (to keep it from buckling up when the foam expands), from the other side of the back wall.

Does anyone see a problem with this?

Thank you!

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Old 12-27-2011, 12:37 PM   #2
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Tub: Foam insulation instead of mortar bed?


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Does anyone see a problem with this?
Yes! I do.

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Old 12-27-2011, 12:39 PM   #3
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Tub: Foam insulation instead of mortar bed?


Yes---the manufactures don't recommend the foam--it can lift the tub and can compress over time.

Do not add water to tub when setting the tub into the mortar---that will compress the wet mud--

when the tub is empty it will spring back and leave a hollow under the floor of the tub--leading to flexing every time the tub is used.
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Old 12-27-2011, 12:40 PM   #4
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Tub: Foam insulation instead of mortar bed?


Buds answer was shorter--but mine used more big words---Mike---
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Old 12-27-2011, 12:44 PM   #5
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Tub: Foam insulation instead of mortar bed?


Yow but your answer explains more.

I have learned not to spend a lot of time on answering questions until I know the OP is seriously interested in an answer. These guys ask the same questions on a dozen different websites and some ask one question and never respond after that so I like to tease a little first.
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Old 12-27-2011, 12:48 PM   #6
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Tub: Foam insulation instead of mortar bed?


Google posters --That's what I call them ,when the question is one sentence long---

I have a feeling this one is sincere ---We will see---Mike---
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Old 12-27-2011, 12:53 PM   #7
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Tub: Foam insulation instead of mortar bed?


Thanks for the answers, Mike and Bud!

I'll stick with the mortar bed.

How about stuffing fiberglass insulation around the sides of the tub once it is installed? (My back wall will be open from the other side until I'm all done.)
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Old 12-27-2011, 12:54 PM   #8
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Tub: Foam insulation instead of mortar bed?


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How about stuffing fiberglass insulation around the sides of the tub once it is installed? (My back wall will be open from the other side until I'm all done.)
It's been done but condensation developing into mold could be a concern. What type of tub is it?
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Old 12-27-2011, 01:15 PM   #9
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Tub: Foam insulation instead of mortar bed?


Thanks again, Bud.

It is a steel tub. Maybe I'll scrap that idea as well. (The wife is always complaining that her bath water turns cold very fast, that's what got me thinking.)
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Old 12-27-2011, 02:08 PM   #10
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Tub: Foam insulation instead of mortar bed?


Insulate the walls behind the tub---as much as you wish--as long as it stays away from the steel tub by an inch or two---

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