DIYing an attic reinsulation project on my 1967 brick split level home in GA USA. I don’t think it’s ever been reinsulated.
So far I have air sealed all top plates and wire protrusions, installed baffle vents that extend to soffit vent cavity, then packed two batts of mineral wool in to create a solid backing and air seal for my blow in fiberglass.
The mineral wool im using is R-15. Since the corners are so tight in the hip roof and the airflow is poor due to how its engineered, I decided to lay overlapping batts to create a dam while still maintaining a gap at the ridge for air flow. It’s not perfect but it’s the best I could come up with.
I’m shooting for 16” blow in depth everywhere else which should give me R-40ish and I’m just accepting that the corners will be less efficient.. thoughts on this approach??
I’m also planning to bury those hvac ducts in the rafter bays and under insulation as best as possible instead of how they are currently tacked to the roof decking in places still.
I’m aiming for good but not perfect. Our electric bill was $650/mo during the summer last year while our house is 1950sqft so trying to reduce that as much as possible as it feels high. Our AC unit was installed in 2016.
Any problems with my work progress so far or plan overall? Thanks!
Happy to answer any questions.