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· bathroom guru
1,357 Posts
You should have a drop ceiling just above the existing tub (that conceals the p-trap for the tub upstairs) and a high hot. Remove the high hot and take a look with a flashlight. You should have 1-1/2" pipe going from tub to a 2" p-trap below the slab. Replace 1-1/2" pipe with 2" and make sure to install a fire collar to maintain slabs fire rating.
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