I was still concerned about the low slope of the drain pipe across the basement (now under concrete) and researched it today. Seems we're pretty far off from the standard accepted 1/4" drop for every 12" horizontal guideline. We worked hard to get 1/4" drop across 8'-12' of run. Water might make it through ok but I have strong doubts solids will run their course properly. Gross to think about I know, but certainly a cause for concern.
From 2006 IRC code:
P3005.3 Horizontal drainage piping slope. Horizontal drainage piping shall be installed in uniform alignment at uniform slopes not less than ¼ unit vertical in 12 units horizontal (2-percent slope) for 2½-inch (64 mm) diameter and less, and not less than1/8 unit vertical in 12 units horizontal (1-percent slope) for diameters of 3 inches (76 mm) or more.
The subcontractors installing something not even close to residential code is alarming to me. I appreciate my field manager working hard to improve the low slope that was there, but any issue we have with clogged drains from that section of pipe is clearly something Wayne Homes will be on the hook for as this was documented prior to concrete concealing it.
*** Field Manager has just reconfirmed Wayne Homes will address any future issue should there be one so that is good ***
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