mineral wool

[halfguard]

is mineral wool and mineral fiber the same thing. a company down the street from me carries this for 32$ for 6 sheets of 4x2 2 inch. they also have john mansville (sp) socalled oc 703 equivelant called duct board. thanx for any help....

 

[bpape]

Sometimes those terms are used interchangably. What's important to justify the price is what density the material is.

Bryan

 

[Innovations]

Also most 'duct board' is faced.