Seen the Reflectix stuff. Seen the stuff at Home Depot that has the wire grid in it. Both options seem to work but at a premium cost.
Why can't one just use some of those Mylar space blankets and staple those in place instead? I see you can git those fer about $1 fer a 4'x7' section on eBay. You might even be able to git the used ones at a marathon fer free...
