In most cases if the shingles go past the drip edge about 3 4 of an inch the shingle edge will break the surface tension unless your roof has a shallow pitch then the water will reach the drip edge and if drip edge is tight to the facia board it will run down the fascia so as added insurance leave space between the fascia and drip edge.
Gap between roof sheathing and fascia.
I doubt that that is the root of the problem though.
I think that this practice differs by region though.
The gap between the roof sheathing and the fascia may be small but it was all the space that bats needed to get into the attic of this house in atlanta.
As a result the drainage improves water flow and protects the roof from potential water damage.
Slowly move down the joint to apply a steady bead of caulk into.
Cleaning gutters and notice 1 5 gap between roof deck and fascia board.
This is a pretty expensive home.
Then i do a metal drip edge to cover it all.
The staining on the fascia suggests that this bat problem has been going on for a while.
The roof decking is left slightly shorter than the rafter ends creating a gap between the roof and the gutter.
Why is a drip edge important.
This material should have extended all the way to the bottom ends of the rafter joists where the roof deck meets the fascia board basically the area where the gutters are hung.
The roof sheathing comes down and ends on top of the 1 x fascia.
Builder looked at it and said he d have one of his siding guys come out and install flashing to fill the gap.
Unfortunately in most homes this is not the case.
Smooth the caulk bead with your finger and begin caulking the joint between the fascia board and the soffit also known as the eave.
The worst part looks about 10 long but i can t see the whole roof since it is too high.