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Homeowner Forum / Construction / January 2006cutting cast iron waste/stack
i need to cut a wasteline to install a PVC "Y" about 3 feet up from the clean out in the basement for an install of a powder room toilet. Do I need to support the stack before I cut it or would the builder (house built 1920's) have installed supports in each floor during construction? I can see a bolt-on support in the attic (a 2 "U" shaped pieces with flanges on each side of the stack bolted together) Also, if there are no other supports would the weight below be too much for a single support to bear? Thanks Scot srasor AT retrieverconstruction DOT com > i need to cut a wasteline to install a PVC "Y" about 3 feet up from the clean out in the basement for an install of a powder room toilet. Do I need to support the stack before I cut it or would the builder (house built 1920's) have installed supports in each floor during construction? I can see a bolt-on support in the attic (a 2 "U" shaped pieces with flanges on each side of the stack bolted together) Also, if there are no other supports would the weight below be too much for a single support to bear? > [quoted text clipped - 3 lines] > > srasor AT retrieverconstruction DOT com The clamp you see in the attic is called a "friction clamp" and serves the purpose you are asking about. However it isnt safe to assume there is one at each floor even though that is the normal practice. Caulked and leaded joints, or no-hub joints will not hold the weight of a stack hanging below. If you have no way to visually check if there is a clamp on the floor directly above where you plan to make the cut you could simply go to the local plumbing supply, buy a friction clamp, then nail/screw a couple blockers on either side of the stack to the underside of the floor joists in the basement. Then affix the friction clamp to the pipe so its resting on the blockers. Make your cut, insert your y, and remove the clamp/blockers. You will be out the cost of the friction clamp (under 20.00 I would assume) but it would be the safest bet. Mark |
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