My 10 year old house in the midwest has atleast a one inch gap between the roof sheathing and fascia. There is also no drip edge or drip edge vent. This runs the whole front of the home, which consists of the garage and front porch (non-living space). There is a soffit with vents; therefore it befudles me why this construction technique would have been used.

I've started noticing water leaking behind my gutters - no surprise, I know. Why the heck would this have been done? Now I have to find drip edge that is long enough to bridge the I missing something?