Sound transmission. Characterization and properties of single walls and floors - Building Acoustics - page 262

given for R and L n by Equations (6.74) and (6.106) we get, as expected, the same result
as in Equation (6.129).

150

140

130

120

110

Lightweight concrete
Hollow concrete
Predicted
Hollow conc. + top floor

100

90

63 125 250 500 1000 2000 4000

Frequency (Hz)

Figure 6.33 The sum of impact sound pressure level and sound reduction index, calculated for two types of
floor. 1) Lightweight concrete floor, 175 mm thick with 60 mm concrete top cover and 2) Hollow concrete
floor, 260 mm thick. The latter is also measured with an added lightweight floating floor (chipboard on elastic
layer).

6.7 REFERENCES

EN 12354-1: 2000, Building acoustics - Estimation of acoustic performance of buildings
from the performance of elements. Part 1: Airborne sound insulation between
rooms.
EN 12354-2: 2000, Building acoustics - Estimation of acoustic performance of buildings
from the performance of elements. Part 2: Impact sound insulation between rooms.
ISO 140-3: 1995, Acoustics - Measurements of sound insulation in buildings and of

building elements. Part 3: Laboratory measurements of airborne sound insulation of

building elements.