OK I know I could have avoided this but how a simple miscalculation could
result in a total disasater.
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
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...