Pipe leak phobia
Fairbanks, AK. HDD = 14,000. We will soon be adding a 2-story addition to our 30 yr old house. I will have 12″ walls, either double-stud or Riversong/Larson Truss, with dense-packed cellulose.
Question, regarding the drain waste vent system in the second floor, living area: The incoming water will be inside the vapor barrier at all appliances. My concern is with the DWV system, which will have to run for several feet along an outside wall. Code here allows pipes within the first 1/3 of the wall’s R value, but I don’t like pipes in exterior walls. For one, I would like them accessible in case of leaks. Ignoring the extra cost, is it a bad idea to build yet another wall inside the VB just to run the DWV system and electrical in?
If I use the Airtight Drywall Approach on the inner-most wall, will I be generating any “issues”? I would not be sheetrocking against the vapor barrier in this area, and don’t see how moving the sheetrock 4″ from the VB can cause any harm, if air sealed.
Fire away. BTW: I am trying to move appliances so the DWV system will run in interior walls, but that will likely not happen completely.
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