you better tar top and side of vent, rafter are 3 foot from out side if you have a 12 inch overhang been a carpenter far 31 years
Tar ? you have any recomendations for that ? all we got is glue , I dont think the garage roof was originally tarred
and what we call icepaper here since we are in a cold climate it prevents moisture and frost on the week
but this will go on top of the metal
screws from the bottom seems a good idea but it will be hard to get up there because there are a ton of rafters up to criss crossed
I guess we could but why is it different from screws from the roof side ?