I am trying to carve a hallway connecting two sections of my house that is currently separated by a garage. It so happens in that area of the garage the elevation is the same as the house, the elevation drop is in a different section of the garage.
First of all I have no plans of the property, nor does the city, nor does the previous owner. I have mapped a lot of it myself my crawling through the attic a lot, so the hallway has to be done by punching through the garage wall, then into a bathroom. I knew there is a vent stack near there...
So I got up to the roof, measure the distance from the roof edge to the stack, 7 feet. OK.
The hallway is to be 3 feet six inches wide, so 4 feet or so from the exterior wall, much less than 7 feet, perfect.
(Only I forgot my roof has a 5 feet soffit overhang...idiot...)
That is the miscalculation...
So I started to break the wall in the garage and here we go:
a cast iron vent straight through the middle of my hallway. I stared at it for an hour, could not believe I forgot to deduct the soffit overhang, and now I am looking at this.
I don't want to open the slab up to relocate the vent, this is cast iron and will be nasty and tricky. I told my wife we may have a nice looking decorative column in the middle of the hallway and she is not smiling...I told her may be I will reroute the vent sideways and up above grade, and so the hallway may have "stair master" right there she can do her daily step up and down there and still she is not smiling...