I know most people recommend the
Certainteed Ultra Gold Duct Board. I am having a hard time finding it and hear that it is expensive ($65/board). Some people have mentioned that they tried the
Dow Tuff-R R13 Insulation. How well would that work and is it safe?
If you look at the links above, the Certainteed is rated for 250* operating temperature while the Tuff-R is rated at 190*. Shouldn't this be a concern?
Any other comments?
-Scott