Hey everyone,
I have a bathroom group that consists of a toilet, shower, and vanity.
The drain for the vanity is 2 inches and serves as a wet vent for the shower and the toilet. This is all pretty standard, but the tricky part is when the wet vent converts to a dry vent, I'd like to down size to 1.5 inches. This is because I have a 2x4 wet wall and I can't bore 2.5 inch holes (due to building code) to fit a 2 inch dry vent.
According to UPC a toilet must vent off a 2 inch pipe. However, I'm in Michigan and it follows the 2015 Michigan plumbing code which is the 2015 IPC. In the IPC it shows that any pipe must vent off a minimum half of its size. So my 3 inch toilet pipe has to have a 1.5 inch vent. According to the chart a 1.5 inch vent from a 3 inch pipe can service 10 dfu, a toilet, vanity, and shower add up to 6.
Therefore, I'm concluding that after the wet vent portion, I can convert to a 1.5 inch vent.
Am I missing something here? I don't see any hidden clause that says otherwise.
I have a bathroom group that consists of a toilet, shower, and vanity.
The drain for the vanity is 2 inches and serves as a wet vent for the shower and the toilet. This is all pretty standard, but the tricky part is when the wet vent converts to a dry vent, I'd like to down size to 1.5 inches. This is because I have a 2x4 wet wall and I can't bore 2.5 inch holes (due to building code) to fit a 2 inch dry vent.
According to UPC a toilet must vent off a 2 inch pipe. However, I'm in Michigan and it follows the 2015 Michigan plumbing code which is the 2015 IPC. In the IPC it shows that any pipe must vent off a minimum half of its size. So my 3 inch toilet pipe has to have a 1.5 inch vent. According to the chart a 1.5 inch vent from a 3 inch pipe can service 10 dfu, a toilet, vanity, and shower add up to 6.
Therefore, I'm concluding that after the wet vent portion, I can convert to a 1.5 inch vent.
Am I missing something here? I don't see any hidden clause that says otherwise.