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At what point in the house can the drainage system go from 4 inch main drain down to a 3 inch pipe ?

Hi to all, I am looking for feedback on this drain layout; A bit more info; material cost is not an issue, this is a new house installation, the job is in BC Canada. I have attached drawings of the layout and the house floor plan, all one story. I have a permit but the town building inspector...

Is a journeyman's ticket ( Manitoba ) valid in another province ? ( BC ) Thanks to those who know

What is the best way to connect two toilets that are almost back to back on the same floor to a common 3 inch stack/vent, I have almost 5 feet of vertical stack to tie into. I am thinking one connection on top of the other ?Thanks.

The BC Canada plumbing code talks about a "Suds pressure zone" can someone tell me if this applys to a single family, one story home ?. I think I need a better diagram/understanding of this code item / requirement. In my case I will have a sanitary drain pipe which will be coming out from the...

During my framing inspection, the building inspector thought I would need a 2 inch sink vent. Here is the layout; double sink has a 2 foot long 1 1/2 trap arm with a dishwasher connection, drains into a 2 inch pipe that is 22 feet long going into the 3 inch main house drain. I was visualizing an...

When going across to the main stack to vent the bathroom sink. Can the vent pipe go inside the water wall cavity ( it's 2 x 8 ) instead of through the top plate / insulation and then across to the 3 " stack in the attic? Assuming it is well above any fixture drains. It's not a wet vent. Thanks

I have a RV trailer furnace that I would like to switch over to natural gas. Is it feasible or could they be just too great a difference in the unit construction. Thanks

Hi to all, a great forum this really is. I am planning my new plumbing/ drain installation. I want everything to be well vented. It is two back to back 3 piece bathrooms. Is it possible to have too much venting ??? Sorry if it is a dumb question. Thanks

Firstly I'd like to thank all the experts here who are willing to help the DYSers. I am in a different trade, more commercial, but I also like to help other people do things the right way if I can. Thanks again. I am building a new home myself from the ground up. Currently just in the planning...