Used this to provide in & out pet access while keeping out heat from a glassed-in south-facing deck. Worked perfectly and had the unanticipated but very welcome benefit of significantly reducing traffic noise. Happy with my purchase; I only wish I'd done it sooner.
I build Cold Rooms for a living, this is pretty good material for the price point. All things being equal, this roll will cover an opening of 8' x 8' with 1/4 overlap. And I'm using a Universal type bar
mmcgr 
