Several questions on bathroom remodeling

[krbing]

I'm new here and appreciate the response to my first question yesterday. I'm stretching my modest skills in attempting a bathroom remodel. Will try not to overload this site with questions but would like to ask several that are on my mind right now:

1. I'm building a partition wall to convert existing bedroom space to bathroom vanity area. This new wall will contain the plumbing for vanity w/double sinks. I'm planning to use 2"x4" studs as opposed to 2"x6", and I'm planning to run a 1 1/2" drain to this wall and vent up through the wall to roof with 1 1/4" or 1 1/2" pipe. Do my intended stud and pipe sizes sound OK? (I consider the new wall to be non load-bearing as I am not moving or removing any other walls.)

2. I've read several do-it-yourself books, but have not found instructions or a diagram for plumbing a double sink vanity. I'm thinking about extending the old drain line to a point about half-way between the new sink locations, then up into the wall, then installing a sanitary cross, which will allow me to branch to each sink and vent up through the top. Is this the way to do it? Anything to watch out for here? (Sinks will be only 6 feet from each other so I believe a single vent half way in between will suffice for both p-traps?)

3. This new wall, in addition to vanity plumbing, will have electrical wiring for receptacles and lights. Are there any restrictions as far as the plumbing and electrical wiring being close to each other?
Thank you.

[Wgoodrich]

YOU SAID;
1. I'm building a partition wall to convert existing bedroom space to bathroom vanity area. This new wall will contain the plumbing for vanity w/double sinks. I'm planning to use 2"x4" studs as opposed to 2"x6", and I'm planning to run a 1 1/2" drain to this wall and vent up through the wall to roof with 1 1/4" or 1 1/2" pipe. Do my intended stud and pipe sizes sound OK? (I consider the new wall to be non load-bearing as I am not moving or removing any other walls.)

REPLY;
You should be fine as you discribe. Only concern is normally the water lines both hot and cold come up through the floor into the vanity if this wall is an outside wall exposed to freezing. If the wall is an inside wall they too may be in the stud space.

YOU SAID;
2. I've read several do-it-yourself books, but have not found instructions or a diagram for plumbing a double sink vanity. I'm thinking about extending the old drain line to a point about half-way between the new sink locations, then up into the wall, then installing a sanitary cross, which will allow me to branch to each sink and vent up through the top. Is this the way to do it? Anything to watch out for here? (Sinks will be only 6 feet from each other so I believe a single vent half way in between will suffice for both p-traps?)

REPLY;
The vent is fine as you discribe. However you need to install a trap on each sink then the drain to the wye then to the main drain. The main drain with the two sinks should be 1 1/2" the drains going to the two sinks after the wye may be 1 1/4" but suggest 1 1/2" there also. One vent to serve the entire bathroom is fine going up through the wall into the roof area and out. Don't forget when you vent through the roof in areas prone to freeze the short part of the pipe going through the roof decking must be 3" to avoid frosting shut during freezing weather.

YOU SAID;
3. This new wall, in addition to vanity plumbing, will have electrical wiring for receptacles and lights. Are there any restrictions as far as the plumbing and electrical wiring being close to each other?

REPLY;
No concern, the wiring may even touch the plumbing as long as the wiring is Romex cable.

Good Luck and let us know how you come out.

Wg