Your thoughts on laterally running drain pipes w/ I joist

[atvalaska]

3' for a toilet... the I joist are BCI's- 16"- 90 series..... drilling laterally through the floor joists, the hole schedule works out fine/and the install guide says I can have at it ...... which means I will have to install short pipe segments and connect them in every joist space with couplings .... but is this a ok thing to do? seems like a pretty big bunch of holes as I have to travel thru 7 of them in a row (16 oc)....then there is the idea that there is the pipe couplings ...the pipe inside never seems to butt perfectly together leaving a little seam 360deg inside the pipe every 15" or so inches ...seems a lot of chit paper can hang up/build up . what u say???

 

[phishfood]

I hate those type of floor joists, for just that reason.

Cut the pipe with a chop saw to get perfectly square cuts, the couplings won't be a problem that way.