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Old 02-08-2010, 01:16 PM   #1
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Location: BC,Canada
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Floor Weight Load


I'm starting a project to redo the upstairs bathroom and I'm concerned about the floor strength under the tub. The tub is located in an alcove with the long end up against what appears to be a supporting wall and the end of the tub is up against an exterior wall. I'm looking at changing the tub to a slightly heavier whirlpool type but I'm concerned about the weight.
The floor joist are 2 x 8" douglas fir with 12" spacing between over a span of 15' 6". One of the joists has a nice little notch cut into it where the tub drain pipe is.
The tub I'm looking sits on four supports and requires strapping under the tub lip along three sides and require floor support of 50 psf under the tub.
The joist span seems to be very close or exceeds the maximum span depending on the variables I use with this online calculator: http://www.awc.org/calculators/span/...rcalcstyle.asp
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Last edited by RalphPeters; 02-08-2010 at 01:24 PM.
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