Our house is missing one Master Bathroom and it is going to be my next project. When I laid new hardwood in the upstairs I left a big hole where the bath is to be installed and it is time to fill that hole with a new bathroom.
I pulled up the 3/4" sub-floor today and confirmed my guess as to what was there. Here's a picture of the area with the sub-floor pulled up and leaning against the wall.
There is insulation because the space underneath this new room is a stamped concrete patio.
There is 1x2 strapping running across the bottom of the floor joists (notched) and aluminum soffit is nailed to the strapping. On top of the insulation is a VB. The floor joists are 2x12s.
First question is can I safely run a 3" drain pipe through the 2x12s? At 1/4" per foot, and a 8' span, it'll leave 3" of wood at the top of the first joist and at the bottom at the last joist. Is it safe to run this vent through the unheated space (I don't really have an alternative). I'm in Southern Ontario and we get regular freezing. Is it okay to run the hot/cold pex supply lines through this space - I'll insulate the pipes with foam rubber.
Looking at my plumbing book, I think I can drain the shower into the stack at the same point as the toilet though I'd need to add a revent before picking up the shower around the corner [Master Bathroom Overview.jpg] (Sketchup file, I left it large for detail).
Since this bathroom is across the house from the others, I'll be adding a new roof vent as well.
Happy Holidays and thanks for any help you can offer.
cheers - mark
[Edit to fix shower/toilet vent description]
Edited 12/28/2007 5:20 pm ET by markg11cdn