Jian
New Member
I am remodeling an old bathroom and trying to convert single sink to double sink drains. The old drain system is 1-1/2 inch copper pipe. The stud thickness is 2-3/4 inch instead of the standard 3-1/2 inch.
I have read several posts on this forum and is thinking to convert to the design below. I would need drill holes through stud for the design. Given the 2-3/4 inch stud thickness and the code only allows max of 60% for non-bearing wall, it means the maximum hole that I can drill through is 1.65 inch. However, the standard outer diameter for 1-1/2 inch PVC pipe is 1.9 inch and is going to be larger than the code allowed hole size. Any suggestions how to get around this issue?
One idea I have is that I could keep using copper as the drain pipe as the outer diameter for 1-1/2 copper is only 1.625 inch and will fit the 1.65 max limit stud hole. But ideally I would like to replace copper drain pipe with PVC.
I have read several posts on this forum and is thinking to convert to the design below. I would need drill holes through stud for the design. Given the 2-3/4 inch stud thickness and the code only allows max of 60% for non-bearing wall, it means the maximum hole that I can drill through is 1.65 inch. However, the standard outer diameter for 1-1/2 inch PVC pipe is 1.9 inch and is going to be larger than the code allowed hole size. Any suggestions how to get around this issue?
One idea I have is that I could keep using copper as the drain pipe as the outer diameter for 1-1/2 copper is only 1.625 inch and will fit the 1.65 max limit stud hole. But ideally I would like to replace copper drain pipe with PVC.
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