Hi all,
I am replacing a bathtub in my house and upon tearing out the old one, I discovered some venting that looks incorrect to me and wanted to get some expert opinions. I have attached a sketch of the configuration. The viewing angle of the sketch is from above, looking down on the pipes. Please excuse the scale as it is way off. The 1 1/2" drain line from the tub's trap runs into the main 3" line coming from the toilet as shown. The sink also enters into this same line 3" line. The sink's vent does come off the drain vertical. Midway between the trap and the tub drain's entry into the main drain, there is a vent line that comes off the drain line with a 1 1/2" sanitary tee. What disturbs me about all this is that the vent line runs horizontal for about 2 feet until it reaches the wall, at which point it goes vertical through the ceiling. I thought that vent lines were not allowed to run horizontal until they were 6" above the flood line of the fixtures. Am I missing something, or is this really an incorrect installation? Thanks for your help.
John
I am replacing a bathtub in my house and upon tearing out the old one, I discovered some venting that looks incorrect to me and wanted to get some expert opinions. I have attached a sketch of the configuration. The viewing angle of the sketch is from above, looking down on the pipes. Please excuse the scale as it is way off. The 1 1/2" drain line from the tub's trap runs into the main 3" line coming from the toilet as shown. The sink also enters into this same line 3" line. The sink's vent does come off the drain vertical. Midway between the trap and the tub drain's entry into the main drain, there is a vent line that comes off the drain line with a 1 1/2" sanitary tee. What disturbs me about all this is that the vent line runs horizontal for about 2 feet until it reaches the wall, at which point it goes vertical through the ceiling. I thought that vent lines were not allowed to run horizontal until they were 6" above the flood line of the fixtures. Am I missing something, or is this really an incorrect installation? Thanks for your help.
John
