Radiant Barrier Insulation

1995dak said
7/16 OSB. I have it off the concrete 3/4in. Like you would do with sheetrock.

RustyRatRod said
Those in the know, please educate me on this thin, reflective "radiant barrier" insulation. I'm going to be looking at slowly insulating my shop this coming year. 28x30 metal building with 9' walls and 12' peak. Will this thin stuff really work? It rarely gets under 20*F during the winter here, but the summer is mainly what I am looking to insulate against.

I was lookin at somethin like this, but I don't know enough about WTF I'm lookin at. Any help or advice? Thanks.

Reflectix 48 in. x 100 ft. Double Reflective Insulation Roll-BP48100 - The Home Depot

If you live in a warm climate. Foil works best with a minimum 1 inch air space. If you have easy access iwould install it 1 inch below your roof decking.. Then I would insulate the ceiling with a foot of fiberglass or blowin. . This would give you the best bang for the buck to stay cooler,next to spray foam. Side walls finished,you could use foil for the vapor barrier with fiberglass.and one inch air space raises the r value over 4. Lots of variables.Good luck