I keep wondering what prevents water from dripping down the fascia, down the soffit and onto the wall or behind the siding on the high side of a shed roof. Sometimes I can envision things that don't necessairly happen "in reality." Is this an issue or am I just visulaizing it wrong? I keep thinking with the soffit at an angle, water would most likely follow it to the wall and cause trouble. I saw where someone on here had cut the ends of their roof rafters on a shed roof so the soffit was horizontal (it seems that would likely stop water from adhering and sliding down toward the wall) but the thread didn't show a finished look. When I visualize the soffit horizontal I am not sure I would like the looks of it.
Can anyone offer help?
Bill
This is a problem with shed roofs and why they aren't used much on houses. If you have enough overhang and it's facing downwind it won't be much of an issue. If the high side faces the wind there's not much you can do about it.
You can run an extra wide fascia board on the top ends of the rafters. If 2x6 rafters then use at least a 2x8 fascia - etc. This gets the water past the ends of the rafters and makes the water drip down to go to the ground without running into the house. I have to use that method on places in the underground complex.
Roll roofing goes clear over the fascia top and then an angle flashing goes over that to keep water from getting into the high side of the roofing and make it go down over the fascia board on the front. Hope I used the right terms --- steel guy here. d*
On the shed roof for my tool shed in the mountains I have not had any problems with water getting into the wall. The inside is unfinished and I've never seen traces of water. I installed the sofit on the underside of the rafters. I actually used vent grills the entire length of the 8 foot soffit and even with that have yet to see water blown in.
Not to say I would do the same with a cabin.
I used metal roofing and the 2 inch matching color steel drip edge along the upper edge of the roof. The drip edge overhangs the fascia and is spaced out from it about 1/2 to 3/4 inch. The bent low edge of the drip edge makes the water drop away from the fascia board. The fascia board extends down past the rafter ends.
Thank you. [cool]
I don't have a cabin (yet!) but at my house I have the 2x6 hanging down past the end of the rafters in addition to a 2 inch metal drip edge that is pretty much flush to the 2x6 and I have no problems at all with moisture. I have watched as water came off it and it seems the drip edge is the key.