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Old 07-12-2010, 10:39 AM   #1
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Not enough mortar under bathtub


We had a new acrylic/fibreglass tub installed with a mortar base but it still feels spongy along sides and part of the middle. I looked underneath and the mortar is only covering the back bottom and a maybe a 6 inch spread in the middle. Is it going to crack eventually? Can this be fixed to be more stable?

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Old 07-12-2010, 05:40 PM   #2
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Not enough mortar under bathtub


If there is movement in the bottom there is a risk of it cracking. Who knows though, it may well last many years. I have heard of using espandable foam insulation under tubs but you need to be careful not to use too much and cause over expansion.

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