Insulation Attic Fiberglass Vs Rockwool

General use of rockwool and fiberglass.

Insulation attic fiberglass vs rockwool.

However fiberglass does not have the same fire resistance as rockwool and melts at 1 000 degrees fahrenheit. It is one of the most popular insulation materials and is cost effective with an r value comparable to rockwool. Fiberglass has an r value of between 2 2 to 2 7 compared to mineral wool weighing in at 3 0 to 3 3. If you plan to add thermic insulation to your room as well consider this.

Batts are pieces of blanket insulation that are pre cut to manageable sizes 15 24 inches wide by 48 or 93 inches long while rolls are strips of insulation similar to batts in width. And two you will have to decide whether to use batts or rolls. Fiberglass insulation costs 25 to 50 percent less than mineral wool. R value is a big deal in insulation so lets see how they stack up.

Mineral stone wool insulation batts are slightly better insulators than the off the shelf fiberglass batts sold at most lumberyards and home centers. Select your attic insulation application. I recommend using roxul in acoustic panels and traps and use the fiberglass in wall and ceiling cavities where it is fully closed in. It is also better at absorbing low frequency range noise than comparable fiberglass.

This helps to delay the spread of fire in a situation where every second counts. So that means for standard 2 4 wall mineral wool comes in r 15 batts while fiberglass comes in r 11 or r 13. Fiberglass has an r value of 2 2 2 7 per inch while rockwool has an index of 3 0 3 3 per inch. Whereas rockwool fibers are spun from liquid rock fiberglass is spun from liquid glass and glued together with a resin.

Mineral wool insulation for the same wall runs about 1 to 1 10 per square foot. Fiberglass insulation for a 2 6 wall costs between 57 cents and 72 cents per square foot. The boiling point of a more common fiberglass insulation can average between 1 000 1 300ºf 537 7 704 4ºc. Use rockwool thermal stone wool insulation to insulate the attic of a new build extension or to increase the r value and top up the current attic insulation especially in an older home.

One you will need to choose the material fiberglass mineral wool cotton or sheep s wool. Fiberglass offers an r value of 2 2 to 2 7 per inch while rock wool has an r value of 3 0 to 3 3 per inch making it a slightly better insulator than fiberglass according to the u s. Fiberglass insulation typically contains 20 to 30 percent recycled content. This makes rockwool a little better at insulating than fiberglass.