04:03AM | 07/20/01
Member Since: 07/05/01
25 lifetime posts
Our attic (floors) is insulated with about 6 inches of rock wool insulation. Would replacing this insulation with fiberglass insulation be more energy efficient?
What type should I use, would the encapsulated Johns-Manville rolls be OK, or should I get insulation without a vapor barrier?


12:18AM | 02/05/16
Dude, rockwool will not burn - fibreglass will under the right circumstances. Fibreglass is a health hazard as you will know if you touched it - worse if you breath it in - some in the UK say it is going to be the next Asbestos. If you want to improve insulation look at Ecotherm - its a way of insulating over the loft joists leaving your rockwool in place, giving you extra insulation and you still get storage space you can walk on. Be careful when insulating - you should look up interstitial condensation and vapour barriers. Good luck
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