1’200 50 Cork 200 – 350 430 – 530 Concrete 2’300 – 2’500 3’700 Wood along the grain 300 – 900 3’500 – 5’000 Steel 7’850 5’000 Glass 2’400 – 2’600 5’000 – 6’000 Table 2 shows the sound levels of everyday sources [...] People don't hear everything equally well. The audibility threshold hits its minimum at between 2,000 and 4,000 hertz. This is the frequency range at which sounds can be heard most easily. Sources of noise [...] medium. It is particularly audible in the human hearing range at vibration frequencies from 16,000 to 20,000 Hz. In physical terms, sound that hits our ears is a vibration of air molecules that leads to

between 2,000 and 4,000 Hz – the exact range at which the human ear is most sensitive. As shown in Figure 1 on page 3, the auditory threshold of humans hits its lowest point between 2,000 and 4,000 Hz. Heavy [...] For many components, a decrease in sound insulation can be observed at frequencies between 2,000 and 4,000 Hz (coincidence). With double-layer constructions, there is also a clear reduction in airborne [...] level between the transmitting room (sound level 1) and the receiving room (sound level 2), as shown in Figure 2. This sound level difference depends on: Component properties transmission, reflection and

resistance factor of μ = 68,000 A vapour seal, e.g. Sisalex 514 (kraft paper + paraffin + glass fibre fabric + aluminium) has a vapour diffusion resistance factor μ = 6,900,000 Diffusion resistance sD - [...] previously reached the impressive μ value of 68,000, has only a relatively modest diffusion-equivalent air layer thickness. s D = μ value x thickness in m = 68,000 x 0.00033 = 23 m Factors for water vapour flow [...] flow The quantity of diffusing vapour is dependent on: 1. Diffusion resistance factor ( µ ) 2. Layer thickness of the construction material (d) 3. Air temperature (ϑ L ) indoors and outdoors 4. Relative

Total cost in EUR Element walls Vapour retardant Ampatex DB 90 300 m2 3.25 975.00 Steep-pitched roof Vapour retardant Ampatex DB 90 150 m2 3.25 487.50 Adhesive technology Ampacoll INT, overlaps 450 running [...] FE, window connections 25 running meters 2.37 59.25 Ampacoll Primax, primer 1 tin 27.50 27.50 Total cost of materials 1’985.35 Total installation costs 450 m2 12.00 5’400.00 Total airtightness costs 7’385 [...] come to 613 Euro, calculated at gross cost. In relation to a single family dwelling worth EUR 350,000, this comes to a mere 0.18 %. This in no way reflects the additional costs that would be incurred by