I have a Victorian row house with a cast iron DWV stack located on the exterior of the house. One of the 4″ waste feeds to the stack rusted out and was leaking. This waste line originated on the interior of the house and passed through the double-brick side wall of the house. On the inside the waste line was joined to a 4″ PVC waste line. I would like to replace the piece of cast iron that was removed with PVC. Based on what I have read, it seems that PVC DWV is acceptable for exterior use. Are there any reasons not to use PVC and replace the old waste line with cast iron? Thanks.
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Replies
2 things come to mind.
1. Is the wall that the pipe is passing through a fire rated wall?
2. PVC really doesn't like the sun very much, painting it or building some sort of encosure to protect would be preferred & in some locations required by code.
I fear no man & only one GOD. Me
Whe are into a code question again. Most areas I work in require the exterior line to be removed if there is any major modification to the existing plumbing, they don't allow any exterior waste or sanitary pipe reguardless of what its made of. Your best bet is to replace the interior pipe and leave the outside alone. Luck.
"If all else fails, read the directions"