I have a small barn like structure on the back of my property that I have started fixing up. Previous owners have done stuff to it as well and I came across this part in the loft. As can be seen in the pictures this light shining through into the inside from the soffit/facia, if that's what it would be in this scenario.
What I am wondering is, is it okay to seal that up? From the other side of the structure, it looks like they are mostly boarded up. I want to try to keep the place at a somewhat decent temperature so I would like to seal it up with some foam to keep spiders and bugs out.
Let me know if you need any more info or pictures. Also I do know about the moss on one side of the roof, that side doesn't get much sun and I live in a wet climate and it has like 3 large trees surrounding it.
Light shining through from the next picture.
where light is shining in from
A wider angle of the area the light is shining in from
front of the structure that appears to be sealed off
Been reading up on things and found https://www.finehomebuilding.com/project-guides/roofing/a-crash-course-in-roof-venting which also seems to mention some of the stuff you said.
It just feels weird to me to just board up a potential issue.