Butech, 2012.pdf

30
The correction factors in dB, which are necessary to obtain the corresponding data for 40NA panels (of 40LA) and 30KA (of 35kA) are shown in the table below.
Type of coating Correction factor [dB]
calcium sulfate 30K -1
Chipboard 40N 0
Natural stone (S) and reconstructed (R), Ceramic tile (T
-1
Finally, the correction factors in dB are shown below for obtaining panel data with a lower cover in steel instead of aluminum.
Below are some examples of how to get the data for each particular group.
Type of coating Correction factor [dB]
Steel (F) 0
Ex.1: Panel 40LAT on a structure with stringers
1. In diagram 1 the data in relation to the panel 40LA0 with stringers obtained are M = 34 dB;
2. From Table 1 is extracted correction factor for the coating of tiles (T), which is - 1dB. The horizontal aerial noise reduction is, therefore, (Dnfw) 34-1 = 33dB
Ex.2: Panel 30KFV on a structure with stringers P and with acoustic insulation sheet stuck.
1. In diagram 1 the data in relation to the panel 35KA0 with stringers P obtained are P = 36 dB;
2. From Table 1 is extracted correction factor for the vinyl (V), which is + 1 dB;
3. From Table 2 extracts the correction factor for the panel 30K starting at 35K, which is-1dB;
4. From Table 3 extracts the correction factor in the lower cover in steel, which is 0 dB. Therefore, the reduction of aerial sound horizontal is (D ) 36 + 1-1+ 0 = 36dB.
nfw
NOTE: It should be noted that the process of in-situ test was carried out in a modular access fl oor installed in compliance with current regulations in place with construction
features and standard techniques. In particular, we note the following:
• The slab was cleaned completely and then it was applied an anti-dust product;
• The slab with RAP honeycomb shape of pre-compressed air was perfectly smoothed, with a total thickness of 20 + 5 cm;
• A simple dividing wall was used for testing with a thickness of 100 mm (plasterboard 12.5 mm, stone wool + 40 + plasterboard12.5 mm);
• A perimeter adhesive seal was placed on the edge of the tile 25x25mm;
• The supports were stuck in compliance with appropriate regulations for the slab;
• For the test it was used a sound insulation sheet with a thickness of 5 mm;
• For the test it was used an acoustic partition under the fl oor sound with the same features of the partition wall.
vertical transmission of noise
In the presented data are the steps taken in a real building in accordance with current regulations (EN
ISO 140-8), to evaluate the eff ect of reducing the modular access fl oor in relation to the transmission
of noise surface of the panel (or how a person in a . fl oor of a building perceives the noise present in
an upper fl oor). In this case, measures are taken fi rst without the modular access fl oor in order to
determine the features of the building itself. The same measures are taken then with the modular
access fl oor already installed. The measurements are recorded for the description of the diff erences
of the eff ect of the added element (modular access fl oor). We present the test results of impact noise
reduction panel expressed by the parameter ALW measured in dB. The higher the value the greater
the reduction in relation to the object to be tested and therefore the greater the reduction in the
transmission of noise when walking on the fl oor that is transmitted to the lower fl oor.
The following data were collected from the panels:
The fi rst diagram shows ALw values obtained in diff erent structural confi gurations, and panels 40LA and 35KA.
The observed conditions diff ered depending on whether there were stringers or not, if there was a noise insulation sheet placed between the support and the tile and if it
was stuck or not (required to stick the pieces have been installed without stringers).
NOTE: The height of the supports was 300 mm for all confi gurations.
vertical impact noise attenuation (Δlw) depending on the confi guration of the access fl oor
36
34
32
30
28
26
24
22
20
18
16
36
34
21 21 23 23 25
25 28 28
Structure without stringers Structure with stringers M or L Structure with stringers P Structure P with insulation sheet
stuck
34 34
The table below allows obtaining the dB correction factors, which need to be added or removed for panels with multiple covers, starting with those without coating (those
listed in the fi rst table).
Type of coating factor [dB]
Vinyl (V), rubber (G), linoleum (D) 2
Laminate (L), Steel (F) 1
Natural stone (S) and reconstructed (R), Ceramic tile (T) -2
Parquet (P) 1
Structure P with insulation sheet
without stick
31