My first post

[Basement_Lurker]

Yes, the Canadian code is behind the time and allows for the use of a double santee to connect back to back fixtures, but any decent plumber knows not to use that fitting there. The original poster knows he has to use a double fixture tee (what you are calling a double fixture fitting) as is described in his drawings. A regular cross is referred to as a double santee here.

While I do agree that the UPC is an excellent code overall, it is also a very expensive and sometimes inefficient way to plumb in my opinion. And I don't even think half the states in your country use that code.

[Willie Two]

Well, I am 45 min. from the US border so maybe I'll look for them the next time I am over at least for the two sinks, otherwise here it is in the Canadian Plumbing Code book.......... On another thought; because I have plenty of room in the crawl space do you all think I should split up and separate vent each arm of the tub drains to be sure of no future problems ?? ( now is the time to spend an extra 30 bucks on pipe and fittings)

[Willie Two]

I am also guessing there is no exact requirement as to the height in the wall of the trap arm connection as long as it meets the rules of common sense ??? ( Terry, I like that rubber hose idea ). Here is my latest attempt at meeting the Canadian Code but really appreciate all the advice both Canadian & US. Your opinions please on this latest drawing.