I’m not sure which category to put this in, but it’s a possibly strange
question about soffit details. I’m going to try to include some pictures,
but it’s completely unclear how attachments work on this site. In
both images, black is the framing and sheathing, blue is the plastic
soffit material, pink is the roof drip-edge, and GREEN is the custom-
bent metal that the folks doing my retrofit are intending to close the
outer end of the soffit with. Usually they do a simple L-bend around
the framed sub-fascia and hook under the soffit to trim it out and help
support it, per “flat.jpg” or the first image.
The potential problem is that since the soffit plastic is installed level,
that water hitting the metal can run underneath, wick up to the lower
surface of the soffit stuff, and cling to it while traveling toward the
house. I realize that thousands of jobs are done exactly this way and
they probably work out fine, but with NO real roofing on the house
yet [just a layer of Grace HT] I saw this problem in action during
rain — water was coming straight down the wall from the *inner*
end of the overhang, and the only way it got there was oozing along
the soffit pieces.
The fix I’m proposing is visible in image 2, “drip.jpg”, where the
metal gets a simple additional little bend to make a small drip edge
down away from the soffit plastic. This guarantees that water
clinging to the underside of the metal L-bend drops off, instead of
transferring to the soffit stuff and wandering toward the building.
The builder evidently thinks I’m nuts for even floating the idea. But
wouldn’t this create a nice backup for the main roof drip-edge, e.g.
any water that happens to hit underneath that will also get forced
off the structure instead of wicking in toward it??