ᐅ Insulation between rafters (mineral wool) versus soundproofing (pumice stone)
Created on: 12 Jan 2024 22:05
B
ButterslideB
Butterslide12 Jan 2024 22:05Hello everyone,
Five years ago, we bought a single-family house (built in 1956) and insulated the sloped roof only from the inside at that time (89.5mm Linitherm Pal GK). The reason: the sloped roof in the living area is built up with 12cm (5 inches) thick pumice blocks, which we would have had to remove in a complex process initially. The current construction has a U-value of 0.211, although the data on the pumice blocks is unclear.
Since we want to install a photovoltaic system this year, the question naturally arises whether we should renew the roof at the same time. It is certainly already around 30 years old, and the underlay membrane is quite damaged in several places. Intuitively, I would clear out the infill panels from the outside and replace the pumice blocks with 12cm (5 inches) of insulation between the rafters.
BUT: Our house lies in the flight path of a nearby airport. The planes fly over our house at about 3,000 feet, and with closed windows, the noise is definitely not disturbing. However, if I replace the pumice blocks with mineral wool, I fear that the noise will penetrate unhindered through the sloped roof into the living area. What is your opinion on this? Would it be possible to achieve acceptable sound insulation with 12cm (5 inches) of mineral wool? If I were to add a 2cm (1 inch) wood fiber board on the rafters, it might even be possible to reach a U-value of 0.14, which would meet the requirements of the BEG individual measures and be subsidized by 20%.
Thank you very much for your assessment.
Five years ago, we bought a single-family house (built in 1956) and insulated the sloped roof only from the inside at that time (89.5mm Linitherm Pal GK). The reason: the sloped roof in the living area is built up with 12cm (5 inches) thick pumice blocks, which we would have had to remove in a complex process initially. The current construction has a U-value of 0.211, although the data on the pumice blocks is unclear.
Since we want to install a photovoltaic system this year, the question naturally arises whether we should renew the roof at the same time. It is certainly already around 30 years old, and the underlay membrane is quite damaged in several places. Intuitively, I would clear out the infill panels from the outside and replace the pumice blocks with 12cm (5 inches) of insulation between the rafters.
BUT: Our house lies in the flight path of a nearby airport. The planes fly over our house at about 3,000 feet, and with closed windows, the noise is definitely not disturbing. However, if I replace the pumice blocks with mineral wool, I fear that the noise will penetrate unhindered through the sloped roof into the living area. What is your opinion on this? Would it be possible to achieve acceptable sound insulation with 12cm (5 inches) of mineral wool? If I were to add a 2cm (1 inch) wood fiber board on the rafters, it might even be possible to reach a U-value of 0.14, which would meet the requirements of the BEG individual measures and be subsidized by 20%.
Thank you very much for your assessment.
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