We want to put a window in our kitchen over the sink. After taking down the sheet rock, we noticed the 1 1/2" vent pipe is in the way. Would it still work correctly, if we put in some 90 degree bends to reroute the pipe, so it isn't in the way, & connect it back into the roof pipe, to prevent rain water from filling pipe. We would also put a "U" pipe on the roof, so water won't run in. Does this seem possible, or do you know of a different way it could be done? If we aren't able to move our vent pipe, our kitchen window would not be centered. Thank-you

Yes you can put in some 90s, 4 of them and go right around the window frame above the header. PVC is easy to work with So I'd go that route. Try to cut as little as you can from the studs. Using a hole saw may be difficult but it would leave more strength in the wall. You don't need to worry about rain or the "U" pipe. Rain falling into a vent is like sand falling on the beach, its OK.

A vent is required to be at least 6 inches above the flood level rim of the fixture it serves before it can be turned more that a 45 degree angle from the riser.

We want to put a window in our kitchen over the sink. After taking down the sheet rock, we noticed the 1 1/2" vent pipe is in the way. Would it still work correctly, if we put in some 90 degree bends to reroute the pipe, so it isn't in the way, & connect it back into the roof pipe, to prevent rain water from filling pipe. We would also put a "U" pipe on the roof, so water won't run in. Does this seem possible, or do you know of a different way it could be done? If we aren't able to move our vent pipe, our kitchen window would not be centered. Thank-you

A standard kitchen countertop is 36" high, which means you can run the vent horizontally no less than 42" inches above the floor.

So, if the lower portion of the framing for the window is a few inches higher than 42", you should be able to drill the vent horizontally through the studs.

Some inspectors will allow you to run it a little lower than the six inches Doug talked about, but only if you use drainage fittings (long sweep 90's) and ask for approval first.