I've got an architect who has specified a 4" waste line with a run of 160' from a guest house that serves a wc, shower, lavy and sink. I plan to suggest a 3" line because I'm worried about line carry of waste in a situation with a 1.3GPF wc, few other water sources scouring the line and intermittent overall water usage due to the sporadic occupation of the building. What do you think?
No announcement yet.
3" or 4" lateral