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Old 01-14-2015, 10:20 PM   #1
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Fill the tub with water or not with mortar bed


So I was following a DIY guide on how to install a tub. One thing it said was after creating a mortar bed under the bathtub, fill the bathtub with water. I followed the instructions to a 't'. I then took a camera and looked under the tub and could see that mortar was under the tub and fill between the void between the sub-floor and the tub nicely. So I was really happy with myself until a read online which said ***don't*** fill the tub with water because it will cause a void.

So now do I have a problem?
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Old 01-14-2015, 10:35 PM   #2
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Quote:
Originally Posted by krm View Post
So I was following a DIY guide on how to install a tub. One thing it said was after creating a mortar bed under the bathtub, fill the bathtub with water. I followed the instructions to a 't'. I then took a camera and looked under the tub and could see that mortar was under the tub and fill between the void between the sub-floor and the tub nicely. So I was really happy with myself until a read online which said ***don't*** fill the tub with water because it will cause a void.

So now do I have a problem?
What kind of a tub are you talking about? What is it made of?
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Old 01-14-2015, 10:49 PM   #3
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American Standard Acrylic Whirlpool - Model 2425L/V -RHO
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Old 01-15-2015, 04:15 AM   #4
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I would not fill with water---it might over compress the mud--causing the tub to spring back into shape when drained--leaving a hollow spot under the tub.
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Old 01-15-2015, 06:26 AM   #5
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Is there any way to check to see if it has too much void/hollow?
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Old 01-15-2015, 06:37 AM   #6
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Not really---i use masons mortar --scoop out 'cow piles' tall enough to reach the bottom of the tub--with enough space between the piles for the excess to squish into--

set the tub gently onto the mortar--wiggle the tub until it settles into place--

do not be tempted to stand in the tub----when level and in position--add roofing nails into the stud above the rim---and leave it alone until set---this method has worked well for me ---I think it will work for you as well--Mike---
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Old 01-15-2015, 12:58 PM   #7
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You need to read the installation instructions for the tub and follow them. If you are using a DIY guide and it conflicts with the Mfg instructions, follow what the Mfg says.

In your case, the Mfg clearly states that they do not want any weight on the bottom of the tub until after the mortar has hardened.

Nor do they want weight on the rim, either from a void caused by your installation method, or by later installation of wall materials.

I would pull it out and reinstall using oh'mike's mortar method. Wiggle it down until you get it in full contact with the leveling stringers.

Edit: No nails, your rim is not designed for them.

Last edited by Oso954; 01-15-2015 at 01:01 PM.
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