cotton-like attic insulation improvemnt


Old 10-02-02, 07:58 PM
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cotton-like attic insulation improvemnt

Does anyone know the r-value of attic insulation that looks and feels like white cotton balls? mine is blown in with no vapor barrier and is about 2 inches above rafters. How can i make this more efficient??
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Old 10-02-02, 09:18 PM
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The insulation you have is know as rock wool or mineral wool. It is a slag of the steel making process. It is extremely fire proof, so much so that you usually find it as packaging material with gunpowder and similar products. Blown in type usually has a R-3 per inch.

I would not recommend you remove this and there is no need for a vapor barrier. Several layers of paint on the ceilings and walls qualify as a vapor barrier. What you want to look for is anything that can penetrate that vapor barrier. Examples are cracks in ceilings and/or walls, ceiling fixtures, electrical wires, etc.

You could add insulation on top of this insulation if you want to.
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