If you’re building a new room addition or a whole new house you might want to check into the product shown in this short video. It’s really pretty good stuff and takes no additional work if you’re putting plywood sheathing on anyway. (probably wouldn’t be worth tearing the old plywood off in a re-roof)
We’re in the “designing mode” for a sunroom addition to our cabin…this looks like great “potential!” Keep “that stuff” coming! franki
Radiant Barrier Sheathing might be extra effective on a sunroom because you’re already fighting an uphill battle to keep cool with all the windows.
It’s not that much more costly, especially on an addition.