Pitch can be 1/8″ per ft. of pipe + or – usualy about 1″ per 10 ft. of pipe, if you are deep you can give it a 1/4″ per. ft. What I meant about looping pipe is like say you are running pipe to sink straight ahead and there is a Lav. before you get to sink well instead of putting a tee in line and run pipe to lav. you run a seperate pipe to lav and sink. Say you had 3 fix. to run cw too, well where your source is you start and run 1 line to each fix an connect the 3 lines and then connect to the source. If you send me your e-mail add. i will draw it up for you.
Art retired plbg