Ensuite Rebuild

mforeman1

Hello everyone.

I am restoring what was once a ensuite bathroom turned walk-in closet back into an ensuite. I am rebuilding the drains for the shower, toilet and sink that I will be adding. As this is on the top storey of the house, all three will be draining into the same 3" ABS and then down into the basement drain.

My question is, do I need to install an expansion joint in the 3" vent that goes up to the roof? If so, what are my options? I live in Edmonton, Alberta, Canada, where the weather ranges from -22 f in the winter to 86 f in the summer.

Thanks! Matt

Dougtheplumber

If I understand you correctly, you will not need it. They are required on as they are making allowances for the building to settle and are only required between the pipe rising from the ground and below the lowest fixture outlet.

mforeman1

This bathroom is on the top level of my house. There is an expansion joint in the basement about 5 feet above ground level, just below where the last connection before it drains into the sewer.

My question is if I need an expansion joint on the plumbing vent directly to the roof, due to thermal expansion of the pipe.

Dougtheplumber

No it is not required as the piping has room to expand through the roof as it is not affixed to any structure very solid between the floor and the roof penetration.

mforeman1

Thanks much! Next question: For the 3" drain that I will be rebuilding from the toilet, what slope is needed? Would you say between 1/8 and 1/4 per foot is adequate? I read that somewhere...