Hi Folks. First time posting.
Im designing a large two story storage shed. It’s 32’x20’ and will have an A-frame style roof with double shed room dormers on each side (Take up most of the roof). The A-frame with be a 9/12 and the shed dormers 4/12. Id like there to be no bearing walls on either floor except exterior.
Where I’m unsure is the shed roof dormers. Not sure how they impact the sizing.
Any thoughts? I have a sketchup model if needed for conception.
Thanks
Replies
I actually just found the answer online and will adjust my plan to include a ridge board and tie.
Sounds prudent.
This could certainly be done with a structural ridge, tho 32' is a long single-span so it'd end up being a fairly large (likely steel) beam. You have enough differential between the slopes that the easiest way to frame this and still have it look good is to hang the dormer rafters flush with the beam, and run the steep rafters over top of the beam. This way you don't have to header-off the dormer rafters and it's a simpler uniform-load calculation on the beam. The dormer will still look like it springs from the steep roof below the ridge, rather than them sharing the same ridge.
user-3012521 Good design practice. Keeping it simple.
32' * 10' 320sf * (local dead load and snow loads) "7x18 DF Glulam" 640 lb beam with minimal loading values. And minimum 8500 lbs on either end make for BIG footings.