Is My Floor Strong Enough for a Tub?


Old 01-29-07, 09:17 PM
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Question Is My Floor Strong Enough for a Tub?

We want to replace our 5' x 34" shower stall with a 5 1/2' or 6' L x 36" W tub. We have 2 x 10 joists spaced at 16". The tub is a recess installation on an outside wall and the joists run perpendicular to the tub length. We have seen sistering joist articles but don't know if that is necessary. Any ideas?
Old 02-01-07, 06:03 AM
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Welcome to the forums! Extending your present fixture by only 6" in either direction won't make or break your plans. I would inspect the joisting to make sure there is no rot or bowed wood in the area, but if it held the shower unit, it should hold the tub. Post back if we can help further with the project.
Old 02-01-07, 07:05 AM
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You should be OK if you are putting in a regular fiberglass tub. I recently installed a jetted tub that required a 50 psf live load support on 2X8 joists with a 12' span. I had to double the joists. I think most living space floor framing is designed to support a 30 psf load.

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