We put up drywall in the garage and the next step is to blow insulation into the roof, since we're renting the machine anyways I figure it's a good time to top up my house's roof as well. It's a split level house so two separate halves to the roof, each about 550 sq ft.
The higher side is about ~R25 at the moment and the lower side is about ~R40 as it looks like they added some during when they renovated that part of the house.
Rough math says it works out to about 80$ to add R10 insulation to a side. Would it be worth bringing it all higher to R60 or so for ~500$?
Other info:
1957 house, no idea how the wall insulation is. Furnace runs quite a lot in the winter but it stays relatively cool in the summer with all the blinds and windows shut so I think it's decent.
Roof has non-vented soffit as far as I know, though I've only checked a few parts (They put vented soffit over solid plywood for looks, dumb). Only gable end vents and then vents on the top of the roof.