Vent Stack in Bath Remodel

Remodeling master bath in manufactured housing. Took out old garden tub in corner of bath. Still have a small shower in the opposite corner. Will be putting in new shower where tub was. Size is 64 x 46 approx. There are presently two vent stacks that go through the roof in the room. One is in the area of the toilet which is just across the short side from the existing shower. There is another vent stack in the area of the old shower. The garden tub which was 6-8 feet from the existing shower only had a p-trap with a studor valve about a foot from the drain. It was hidden under the support area of the tub. I originally planned to replace the studor valve with a through the roof 1 1/2" vent stack but then got to thinking that I may not have to. As the drain leaves the area of the studor valve, it goes about three feet and turns right and then dumps into the drain which the existing shower dumps into. Question is, Can I just leave the studor valve in the wall (with plate access) or should I put in a complete new stack for the shower. I did increase the size of the 1 1/2" drain to a 2" drain.

Thanks in advance.
Tim

You do not have to run the vent to the roof. What you can do is tie the vent into an existing vent system. Oh and that is not a studer vent, that is an older mechanical vent.

Thanks for the correction on the studer being a mechanical. I will search to understand the difference. If the drain shown already ties into the existing shower drain, wouldn't the existing shower vent that goes through the roof serve as the vent or did they put the mechanical vent there because of the distance from the shower vent?

Barlow46 said:

Thanks for the correction on the studer being a mechanical. I will search to understand the difference. If the drain shown already ties into the existing shower drain, wouldn't the existing shower vent that goes through the roof serve as the vent or did they put the mechanical vent there because of the distance from the shower vent?

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The distance is one of the issues. The maximum distance from a vent is 5 foot. Also each fixture must have its own vent coming of the drain line. Like I said though you do not need to run the vent through the roof, you can run it to a common wall and tie it into the existing vent 48" up the wall or even run it into the attic then tee it in there.

The difference from a mechanical vent and a studer is the mechanical vent uses a spring. Where the studer uses a ball that moves when their is negative pressure in the system. Its best to stay away from both at all costs.

Thanks for the advice. I think at this point I will just run the one in the pic through the roof and not worry about it.