Rayayork
Member
Thank you
New Master Bedroom and Bathroom Addition
- Thread starter Rayayork
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Rayayork
Member
After the P traps, how long can a 2" horizontal drain run in the crawlspace to meet the 3" sewer branch?
Also, I am considering using an AAV under my double vanity and in the washer closet with a in wall vent for fresh air intake. Would cut down on a lot of drilling. They are accepted in Delaware and the IPC. Anyone see any issues with this? My shower will still be dry vented per the drawing and I assume it would still be OK to wet vent the toilet? Thanks for all the info.
Also, I am considering using an AAV under my double vanity and in the washer closet with a in wall vent for fresh air intake. Would cut down on a lot of drilling. They are accepted in Delaware and the IPC. Anyone see any issues with this? My shower will still be dry vented per the drawing and I assume it would still be OK to wet vent the toilet? Thanks for all the info.
The requirements for the distances of the vent for a P-trap are shown in post #4, and reasoning for those distances are shown in #6.
After your P-trap vent, you won't have any distance requirements to worry about as long as you maintain the 1/4" per foot slope.
After your P-trap vent, you won't have any distance requirements to worry about as long as you maintain the 1/4" per foot slope.
Rayayork
Member
Thanks. Any thoughts on the AAV?
There has been lots of discussion on AAVs of late on this forum. AAVs are mechanical devices that can and do fail. The result isn't totally disastrous, but they can cause drainage problems which will usually be noticed before any major issue occurs. They also do need some maintenance at times to clean dust and dirt for them to operate correctly. As such, they cannot be enclosed in a wall, but they can be behind a louvered cover in a wall box.
A dry vent is pretty foolproof and is always best. As I am not a professional plumber who has had to install several thousand systems, I've always been able to install atmospheric vents. In other words, I've not been in a position to even consider an AAV. But they do have a place when installing an atmospheric vent is difficult due to layout, cost, etc.
A dry vent is pretty foolproof and is always best. As I am not a professional plumber who has had to install several thousand systems, I've always been able to install atmospheric vents. In other words, I've not been in a position to even consider an AAV. But they do have a place when installing an atmospheric vent is difficult due to layout, cost, etc.
Rayayork
Member
Thanks for all your help. Passed inspection this week with no changes required!
Great news!
