what helped me a lot was putting electric fans in our attic. My AC guy told me my attic was about the hottest he’d ever been in. I knew I had to do something......they work great too. 3 years now.
You think the forced attic ventilation is a paying proposition? The work but have they saved money on the AC?
I’ve been considering a fan in the attic or radiant barrier paint on the decking.
One argument against fans is that they pull air from inside the house to the attic with the negative pressure. Can’t see it with 20” or more of fiberglass insulation.
I wish I had put Koolply on when we redid the roof, I will on the addition that is upcoming. Not a believer in the encapsulated attic but use of mini-splits instead. Duct work does not belong in attics and does not belong much of anywhere. I’ll be replacing the R-2 junk with R-8 ducts this winter and freshening the insulation in the attic where I do have the old forced air split system. The addition will have a three zone cassette mini-split based system with Koolply decking and lots of foam.