The Freudenberg Politex Group

The Freudenberg Politex Group
Underfloor soundproofing
•
•
•
•
•
•
•
rot-proof
quick and easy to lay
recyclable
light
anti allergenic
dimensionally stable
compression resistant
Underfloor soundproofing
hable
CONSTRUCTION SYSTEM LAYERS: NEW CONSTRUCTION / RENOVATION
1.
2.
3.
4.
5.
Slab surface
Technical systems embedded in concrete
: polyester nonwoven laminated with a synthetic film
Finishing concrete
Finished floor
METHOD OF APPLICATION
thable
A.
B.
Lay the sheets with the film facing
upwards on the surface to be
covered
Remove the protection from the
adhesive stripe and secure the sheets
together by applying adhesive to
the tab of the second sheet
C.
D.
Lay the finishing concrete
Lay the ceramic, marble or parquet
flooring
HOW TO LAY THE SOUNDPROOFING MATERIAL CORRECTLY
•
must be turned up at least 10 cm at the walls; any surplus material may easily be removed
using a knife
or
a cutter.
Breathable
Breathable
• Avoid laying the skirting board directly in contact with the flooring so as not to create a sound bridge between
the two elements. The gap between the skirting board and the flooring may be filled using an elastic sealant.
Do not lay the skirting board until the flooring has initially settled.
THANKS TO ITS FLEXIBILITY,
MAY EVEN BE LAID ON FINISHED SURFACES THAT ARE NOT PERFECTLY SMOOTH OR UNIFORM.
Applications – characteristics
The Freudenberg Politex Group
INTRODUCTION
The problem of noise pollution, particularly in urban developments, is receiving more and more attention.
The ultimate aim is to achieve an ever-increasingly higher level of quality to our living environment, based upon
the protection of each individual’s personal health. It is well-known and scientifically proven however that noise
pollution is a drawback of technological progress and is the cause of increasingly frequent physical disorders.
In our homes we experience noise pollution deriving from flats next to ours or from sanitary fittings.
Noise is transmitted through the air as well as through structures, via partition walls as well as outside walls.
The research for solutions to control the propagation of noise has become an absolute necessity.
Specific noise regulatory standards have been issued in order to guarantee the construction of higher quality
homes, including effective soundproofing duly tested and certified.
FLOOR SOUNDPROOFING
Due to its intrinsic characteristics, the floor is a construction element which
in itself offers a good degree of airborne noise insulation, with an Rw of
between 47 and 53 dB; but, in case of direct impact on the flooring surface
(ie footsteps), the waves are transmitted with higher speed and cause a
significantly higher level of noise.
On the basis of the relationship between mass of elements and frequency of
noise, the sound insulating power of a building system increases when the
mass per unit area is increased.
Increasing the mass to obtain an improvement in soundproofing is not, of
course, an ideal solution because it is economically disadvantageous and
technologically impracticable (the flooring would be far too thick). A more
preferable solution is the construction of a ‘floating floor’, which breaks up the
continuity and compactness of the floor, in favour of a more elastic construction
system of the “mass-spring-mass” type, capable of absorbing vibrations.
To obtain a significant reduction of noise caused by footsteps, bumps and
percussions, it is necessary to lay an elastic material between the layers of
the slab. Breaking up the uniformity of the construction system, as indicated
Breathable
in the scheme,
vibrations are blocked at source.
Applications – characteristics
EXPERIMENTAL MEASUREMENT OF FOOTSTEP NOISE:
LABORATORY AND FIELD TESTS
Laboratory measurements of the reduction of transmitted impact noise by floor coverings on a heavyweight standard
floor are defined by the UNI EN ISO 140-8 standard. This sets out the requirements for both the test environment
itself together with the equipment to be used in order to record the measurements.
In brief, the laboratory test is carried out using a soundproofed structure with a standard device that makes an
impact noise on the floor slab; a rotary microphone together with a frequency analyser are situated on the floor
below.
The data obtained and elaborated according to UNI EN ISO 717-2 standard are expressed in the footstep
noise insulation index ( Lnw), which indicates the difference of sound transmission values between a bare floor
and that of a floor with the soundproofing material laid between the bearing structure and the sub-base.
Field measurements of impact sound insulation of floors are carried out by applying the UNI EN ISO 140-7
standard.
It is therefore necessary, during the design phase, to allow for a measurement of the transmission of footstep
noise through a structure when being built, that is a calculation of the standard floor footstep noise index,
L’nw (see UNI EN ISO 12354-2)
The formula
L’nw =
Lnw0 -
Lnw + k
where:
Lnw0 is the noise transmission index for a bare floor
Lnw is the footstep noise reduction index
k (correction value due to lateral transmission) is assumed to k = 2 dB
may be used to make this kind of assessment in analytical form, so that sufficiently reliable reference data may
be obtained. It should however be underlined that the result of the tests on laid floors depends greatly on the
environment around the building site and the materials being used.
Breathable
Applications – characteristics
The two examples given below refer to types of structures commonly used within the building industry:
Type A LAYER SRUCTURE: clay-block slab
The Freudenberg Politex Group
thickness (cm)
Finishing floor
1
Substrate
5
Lightweight-cellular concrete
10
Slab
Structural screed
Clay block
Lnw0= 81 dB
4
20
Type B LAYER SRUCTURE: reinforced concrete slab
thickness (cm)
Finishing floor
Substrate
Lightened-cellular concrete
1
5
10
Slab
Reinforced concrete
Lnw0= 74 dB
20
ble
When
is laid in between the construction, we can expect the following L’nw values.
LAYER STRUCTURE
300
Breathable
450
Type A
Type B
Lnw
26 dB
26 dB
L’nw
57 dB
50 dB
Lnw
32 dB
32 dB
L’nw
51 dB
44 dB
Technical datasheet
Breathable
U.o.M.
EN ISO 9073 - 1
Weight
Composition
Thickness
300
450
340
490
Polyester (PET)
250
400
250
400
Glue
10
10
10
10
Polyethylene (PE)
40
40
80
80
3,8
6,5
3,8
6,5
EN ISO 9073 - 2
g/m2
g/m2
mm
Acoustic properties
Noise reduction
EN ISO 140 - 8
EN ISO 717 - 2
Dynamic strength
Compression resistance
Lw 26
Lw 32
Lw 26
Lw 32
EN 29052 - 1
s’t = 46
s’t = 12
s’t = 26
s’t = 16
MN/m3
EN 1606
0,14
0,48
0,14
0,48
mm
LAYER STRUCTURE
1
2
3
1. sound absorbing polyester nonwoven
2. protective synthetic film
3. longitudinal jointing adhesive tape
Breathable
dB
Supply characteristics
U.o.M.
Weight
300
450
340
490
g/m2
Length
60
35
60
35
mt
120 + 10 (PE TAB)
Height
Surface
72
Diameter
42
72
cm
42
cm
60
Breathable
m2
Weight of roll
22
19
25
21
kg
Pallet (8 rolls)
576
336
576
336
m2
Supply: roll or pallet
for partition walls
300
U.o.M.
Weight
300
g/m2
Length
60
mt
Height
22
cm
Surface
13
m2
Diameter
60
cm
4
kg
Weight of roll
Feb. 2007 edition
SPECIFICATION ITEM
underflooring is made of nonwoven polyester coated on one side with a synthetic protective film.
The underflooring is supplied in rolls having an overlapping edge and contact adhesive sealing tape, to ensure
that the sheets can be overlapped quickly and correctly. The material must be accompanied with a suitable
certification, issued by an external laboratory and covering the following acoustic properties:
Thickness
Footstep noise insulation EN ISO 717-2; EN ISO 140-8
300
g/m2
3,8 mm
Lw= 26 dB
450
g/m2
6,5 mm
Lw= 32 dB
The Freudenberg Politex Group
www.freudenbergpolitex.com
Note
The Freudenberg Politex Group