How many sewer vents are necessary???
I am building a new house and asked my plumber to make certain to minimize the number of sewer vent penetrations as much as possible. The house has two bathrooms and a utility room where this really becomes a concern. I anticipated that he would tie all vents into one penetration for each room. Instead, he took the individual vents straight out the roof with one exception where he joined the bathtub and shower vents in the master bath.
What are the general rules/codes for combining sewer vents so that you can minimize penetrations? When I asked him, he told me that based on the two baths and separate utility room that I needed a minimum of four 1 1/2" and two 2" vent stacks.
Thanks for any help.