I've been wondering about that too. Fiberglass seems tempting because of durability, but honestly, I'm not totally convinced the R-value difference is...

Yeah, that's spot on. Flashing is sneaky like that... I remember spending a whole weekend resealing around my windows only to find out later it was ac...

Haha, yeah, padding the budget is a lifesaver. When we did our windows last summer, I thought we'd covered everything... then boom, water damage behin...