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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. Department ... Mar 30, 2016 · Mineral wool by nature is stronger and DENSER since it is “ROCK” SLAG. The Lamba the ability to retain HEAT is a bit better lets say give Fiberglass a 7 and rock wool a 10…..Rock wool seems to do a little bit better with “diffusion” since it is denser and may just slowing things down a bit…perms for both are about the same. Jul 17, 2017 · In the lab, where STC ratings are generated, walls are air-sealed. Walls in real buildings may or may not be. Several years ago, Johns Manville measured the sound transmission loss and STC ratings for a number of wood-framed exterior walls, with both fiberglass and spray foam cavity insulation. Manson Insulation AK Board is a versatile product for thermal and acoustical applications such as heating and air conditioning ducts, power and process equipment, boiler and stack installations, metal and masonry walls, wall and roof panel systems, curtain wall assemblies and cavity walls.