I need to run a drain line for a sink through a multitude of joists. I could certainly cut 16" pieces of PVC pipe and use couplers to join, but, the numerous joints seems like an excess of places that failure could occur.
PVC pipe, with added plasticisers to make it flexible, behaves almost exactly like rigid PVC in terms of pressure rating, interior smoothness, etc. It can be solvent welded into regular PVC fittings. Would it be to code (2018 NSPC; I'm in NJ) to use a carefully supported run of flexible PVC to ensure slope is maintained in place of rigid PVC with numerous joints?