Foam Spray On Sub-floor Prior To Setting New Tub? - Kitchen & Bath Remodeling - DIY Chatroom Home Improvement Forum

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Old 04-29-2014, 10:39 PM   #1
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Foam Spray on sub-floor prior to setting new tub?

When installing a new tub has anyone ever applied "Great Stuff Gap Filler Foam" spray under tub prior to setting new tub in place - I was watching You Tube tub installation video and the installer applied this to the sub-floor prior to setting tub in place
Please let me know any thoughts or comments on this practice - I was unaware and seen on video
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Old 04-29-2014, 11:09 PM   #2
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No way would I do that for several reasons.
Foam is compressible.
It expands as it dries enough to lift the tub or cause a raised area if it's a fiberglass or plastic tub.
Just follow the manufactures install directions to the letter.
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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Old 04-30-2014, 08:22 AM   #3
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An old plumber told me to put a bed of grout under the tub, because the grout won't shrink as much as typical mortar. I did that when I put in a fiberglass shower stall 10+ years ago and it's still rock solid, and I would do it that way again.
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