[AGWhitehouse]

Hard to really give the best advice without a sketch of what you're dealing with, but what about going through the stairwell behind. If it is a stair down is there enough headroom above to have a 4" pipe crossing. What's the possibility of extending the run in the crawl space? You don't want to have the run too long (code restricts it). Remember also, if you are running the exhaust in an un-conditioned space and you live in a climate that has freezing temps, then you should to insulate the pipe to minimize moisture condensation as this will grab onto the lint and eventually clog you line.

 

[jtimian]

yeah, its hard to describe where the dryer is located. Going across the stairwell was my first thought when we bought the house. Thought I would be able to exhaust out the side of the house. Looking at it now it would actually put the vent out the roof still but about maybe 2 or 3 feet up. Not sure if that is any better or worse than going straight up and exiting closer to the peak of the roof. I can extend it through the crawl space but would exit under the composite deck, not sure if that is a great idea (access, snow, etc)