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Old 01-17-2017, 01:43 PM   #1
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Sufficient weight distribution tub flooring


Hello, I am in progress of giving my 1969 bathroom a face lift. The original space had a 12 inch high (60x30) cast iron tub (approx. 450 pounds) which has been broken down and will be replaced with an acrylic 60x32x20.5 (depth) tub with a maximum capacity of 69 gallons. Weight of tub (dry) is 124 pounds.

my concern is in the picture attached circled in red is an area of subflooring that has been cut into pretty significantly to make room for the drain assembly for original tub. The area circled in red flexes pretty easily with just putting slight pressure with my foot. Should I be concerned when the new tub is installed that I may compromise the strength in the area. I don't think my tub (along with me) will fall through to the kitchen below but do I re-enforce that area with some wood from underneath?

Should I be concerned with the original subfloor with this new tub as it will hold significantly more water than original tub but the cast iron tub was about 4 times as heavy to begin with?
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Old 01-17-2017, 03:06 PM   #2
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Re: Sufficient weight distribution tub flooring


If it was mine I'd be adding screws to the old floor boards and adding another layer of 1/2 A/C plywood making sure to miss the joist and fastening every 4" on the edges, 6 to 8" in the field.
8D ring shanked nails or narrow 1-1/4 crown staples will work.
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Old 01-17-2017, 03:07 PM   #3
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Re: Sufficient weight distribution tub flooring


Wouldn't be a terrible idea to pull up that board and brace up the underside via some blocking and thickness.
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Old 01-17-2017, 04:00 PM   #4
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Re: Sufficient weight distribution tub flooring


Thanks all. Appreciate the advice. Adding additional support is the way i will go with.
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