U.S. patent application number 12/463540 was filed with the patent office on 2010-11-11 for composite material multilayered membrane with sound insulating and sound absorbing to mitigate impact noise.
This patent application is currently assigned to TEMA TECHNOLOGIES AND MATERIALS srl. Invention is credited to Nicola Busatta, Federico CAIS, John Igo, Giovanni Veil.
Application Number | 20100282539 12/463540 |
Document ID | / |
Family ID | 43061699 |
Filed Date | 2010-11-11 |
United States Patent
Application |
20100282539 |
Kind Code |
A1 |
CAIS; Federico ; et
al. |
November 11, 2010 |
COMPOSITE MATERIAL MULTILAYERED MEMBRANE WITH SOUND INSULATING AND
SOUND ABSORBING TO MITIGATE IMPACT NOISE
Abstract
The composite material multilayered membrane of the present
invention is sound insulating and sound-absorbent, acting as sound
deadening insulation for noise impacts, mainly but not exclusively
to be used in flooring, and in particular under the slab in
floating floors, with the aim of reducing the transmission of noise
into the below room. This membrane includes several layers, which
include at least one polymeric monofilament three dimensional mat,
at least one resilient mat, and at least one topping layer of
waterproofing, breathable or not, tissue. This multilayered
membrane with a thickness under a weight of 2 kPa of at least 8 and
maximum 15 mm, preferably 10-12 mm, so as to achieve a normalized
noise level in the disturbed room Lnw below 50 dB, or an impact
insulation class of at least 60 points.
Inventors: |
CAIS; Federico; (San
Vendemiano (TV), IT) ; Busatta; Nicola; (San
Vendemiano (TV), IT) ; Veil; Giovanni; (Sacile (PN),
IT) ; Igo; John; (Blanchard, OK) |
Correspondence
Address: |
EGBERT LAW OFFICES
412 MAIN STREET, 7TH FLOOR
HOUSTON
TX
77002
US
|
Assignee: |
TEMA TECHNOLOGIES AND MATERIALS
srl
Vittorio Veneto (TV)
IT
|
Family ID: |
43061699 |
Appl. No.: |
12/463540 |
Filed: |
May 11, 2009 |
Current U.S.
Class: |
181/290 ;
181/294 |
Current CPC
Class: |
B32B 2262/0276 20130101;
E04F 15/20 20130101; B32B 2262/0253 20130101; B32B 2307/7265
20130101; B32B 2262/0261 20130101; B32B 7/12 20130101; B32B 29/02
20130101; B32B 7/06 20130101; B32B 2255/26 20130101; B32B 5/06
20130101; B32B 2471/00 20130101; B32B 2255/12 20130101; B32B 5/22
20130101; B32B 2307/724 20130101; B32B 5/022 20130101; B32B 5/02
20130101; B32B 2307/7246 20130101; B32B 2307/102 20130101; B32B
2307/718 20130101; B32B 5/26 20130101; B32B 2307/10 20130101 |
Class at
Publication: |
181/290 ;
181/294 |
International
Class: |
E04B 1/82 20060101
E04B001/82 |
Claims
1. A multilayered composite material membrane, being sound
insulating and sound absorbent towards impact noise in flooring and
thermal insulation auxiliary, the membrane comprising: at least one
3-dimensional polymeric monofilaments mat; at least one resilient
mat; and at least one waterproofing, finishing layer, wherein said
resilient mat is a synthetic fibers mat coupled with at least one
waterproofing finishing layer, the mats and layer having a total
thickness, under a weight of 2 kPa, comprised between at least 8 mm
and at most 15 mm.
2. The multilayered composite material membrane according to claim
1, having a thickness under a weight of 2 kPa between at least 10
mm and 12.5 mm.
3. The multilayered composite material membrane according to claim
1, wherein the 3-dimensional polymeric monofilaments mat is
comprised of polypropylene based extruded filaments, entangled and
welded at crossings, having a weight comprised between 400
g/m.sup.2 and 700 g/m.sup.2 and having a thickness under a weight
of 2 kPa comprised between at least 8 and at most 10 mm.
4. The multilayered composite material membrane according to claim
1, wherein the 3-dimensional polymeric monofilaments mat is
comprised of polypropylene based extruded filaments, entangled and
welded at crossings, being wavy shaped with parallel channels
structure.
5. The multilayered composite material membrane according to claim
1, wherein the three dimensional polymeric monofilaments mat is
comprised of polypropylene based extruded filaments, entangled and
welded at crossings and having a cuspated shape.
6. The multilayered composite material membrane according to claim
1, wherein the three dimensional polymeric monofilaments mat is
comprised of polyester based extruded filaments, entangled and
welded at crossings.
7. The multilayered composite material membrane according to claim
1, wherein the three dimensional polymeric monofilaments mat is
comprised of polyammide based extruded filaments, entangled and
welded at crossings.
8. The multilayered composite material membrane according to claim
1, wherein the resilient mat is comprised of a non woven fabric of
synthetic fibers.
9. The multilayered composite material membrane according to claim
1, wherein the resilient mat is comprised of 3.3 to 20 dtex
synthetic polyester fibers, needled and resined.
10. The multilayered composite material membrane according to claim
1, wherein the resilient mat is comprised of 6 to 17 dtex synthetic
polyester fibers, needled and resined.
11. The multilayered composite material membrane according to claim
1, wherein at least one resilient mat is comprised of synthetic
polyester needled and resined fibers, having a weight between at
least 150 g/m.sup.2 and at most 450 g/m.sup.2.
12. The multilayered composite material membrane according to claim
1, wherein the at least one resilient mat is comprised of synthetic
polyester needled and resined fibers, having a weight between at
least 200 g/m.sup.2 and at most 300 g/m.sup.2.
13. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of low density polyethilene, weighing between at least 10
g/m.sup.2 and at most 80 g/m.sup.2.
14. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of a waterproofing and vapor permeable synthetic spun
bonded tissue.
15. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of waterproofing and vapor permeable synthetic spun
bonded tissue weighing between at least 90 g/m.sup.2 and at most
160 g/m.sup.2, with water penetration resistance higher than 2
meters of water column according to EN 20811, with a vapor
diffusion coefficient sd comprised between at least 0.01 and at
most 0.05 according to EN ISO 12572.
16. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of waterproofing and vapor permeable polypropylene based
spun bonded tissue.
17. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of waterproofing and vapor permeable polyester based spun
bonded tissue.
18. The multilayered composite material membrane according to claim
1, wherein the at least one waterproofing finishing layer is
comprised of a waterproofing and vapor permeable synthetic spun
bonded tissue at least 8 cm larger than the monofilament mat and
the resilient mat, forming a selvedge equipped with a minimum 15 mm
wide butyl strip, protected by a release silicone paper.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not applicable.
NAMES OF THE PARTIES TO A JOINT RESEARCH AGREEMENT
[0003] Not applicable.
INCORPORATION-BY-REFERENCE OF MATERIALS SUBMITTED ON A COMPACT
DISC
[0004] Not applicable.
BACKGROUND OF THE INVENTION
[0005] 1. Field of the Invention
[0006] The invention relates to a composite material multilayered
membrane, which acts as sound insulating and sound absorbent
barrier to mitigate impact noise in construction, more particularly
in floating floors construction.
[0007] 2. Description of Related Art Including Information
Disclosed Under 37 CFR 1.97 and 37 CFR 1.98.
[0008] Definitions. The term "floating floor" indicates a floor
formed by a floating, at least 1 inch thick, slab, resting on top
of a generally elastic panel which separates it from the subfloor,
in order to form an oscillating system which absorbs the impact
energy. The term "impact noise" refers to: [0009] a percussion on
vertical walls or floors caused mainly by pounding or falling
objects; [0010] a friction caused by furniture moving or other;
[0011] a vibration due to machinery or equipment that are in direct
contact with the walls or the floors. This impact noise spreads
directly through the solid structures of the building, not only in
the underlying room which is the most exposed, but also in the
other ones, more or less distant from the one in which the
phenomenon occurred, according to the structural characteristics of
the building.
FIELD OF APPLICATION
[0012] Conventionally, users of spaces in residential buildings,
feel the need to isolate themselves from the noise of their
neighbors, in particular from the impact noise from upper floors.
Although many engineers, designers and manufacturers in recent
years have adopted sound control systems, using materials readily
available on the market, such as rubber rolls or panels, cork rolls
or panels, woven polypropylene or polyethylene rolls and other
similar products, only a few of these solutions are technically
adequate and in compliance with tests and certifications relating
to sufficient dynamic stiffness. Indeed, very often this parameter,
that is the value which defines the ability of an insulating
membrane subjected to a dynamic solicitation to deform elastically,
is unknown, or these values are not supplied by the manufacturers,
and then on continue to take not technically correct application
systems. It must be considered that any source of sound is
transformed into a source of noise if it becomes a source of
disturbance to other people, so insufficient acoustic soundproofing
is considered a defect of the building. Under the civil law
relating to business, it is the vendor that must repair the defeat
or reduce the price of the building.
[0013] In order to decrease the transmission of noise impact, as
known, various elastic acoustic products were then developed,
predominantly to completely isolate and solidify the floor from the
rest of the rigid structures. There are numerous examples of
national legislation laying down restrictions on the transmission
of noise between consecutive rooms, using the parameters defined by
organizations and groups to measure the noise in the disturbed room
when a specific tapping machine is running into the room above. The
legislature has thus defined the limits of noise to be observed and
then the acoustic requirements of buildings, especially of the
floors between two consecutive levels. Over the years, legislative
limits have become gradually more restrictive and as seen, several
devices have been developed by different companies to solve this
problem. These devices will function when their elasticity is
energized by a mass that acts on them, and thus are preferably used
under floating floors. However, in some cases, such as in building
renovation, it is not always possible to make a floor for space or
load matters, so some devices may be used directly under the
ceramic tile or wood parquet.
DESCRIPTION OF PRIOR ART
[0014] A search has been conducted in the field of acoustic
membranes and impact noise insulation devices, which made it
possible to trace at least the following documents: [0015] D1
ITTV2006A000054 (Cais et al.) [0016] D2 DE1224020 (Mueller) [0017]
D3 FR1539907 (Saint Gobain) [0018] D4 FR2056275 (Saint Gobain)
[0019] D5 FR2517728 (Strati France) [0020] D6 FR2824094 (Siplast)
[0021] D7 FR2775013 (Nortene Technologies) [0022] D8 JP7166617
(Terayama et al.) [0023] D9 JP2013656 (Kuroda)
[0024] D1 describes a soundproof membrane for floors, intended to
be used directly below the slab in floating floors or directly
under the floor finishing to reduce the transmission of impact
noise between two consecutive levels of a building, which consists
of a set of mats, made from monofilament fibers or polymers, or
alveolar materials with at least one protective waterproofing film
and characterized by the fact that this multilayer of mats defines
a space for the most part filled with air, called "air foil", with
a thickness of at least 6 and at most 20 mm, and preferably 10-15
mm. The main purpose is to develop a sound-floor membrane through
which it is possible to obtain a particularly effective
soundproofing between consecutive levels of a building by allowing
to contain noise from the upper floors within a tolerance level to
be provided under 58 dB, conventionally calculated, by maintaining
the advantages of a single product to be used directly under the
floor finishing or under the slab in floating floors.
[0025] D2 describes the same principle with one layer of
soundproofing panels, made up of a glass fiber felt of at least 130
grams per square meter, topped by a rigid layer of bitumen or
resin.
[0026] D3 introduces the use of felt in a glass fiber with specific
characteristics such as fiber length of at least ten centimeters,
fiber diameter from 10 to 40 .mu.m, to form an insulating felt
weighing from 150 to 300 g/m.sup.2, and D4 describes the use of a
felt in a glass fiber under a floating floor to isolate the tapping
noise.
[0027] D5 introduces the use of felt in a glass fiber with specific
characteristics, combining an elastic material to a load bearing
and sound waves distributor panel, to be used directly below the
floor finishing, avoiding to use the floating floor.
[0028] D6 includes a lower support and an upper surface comprising
a felt or other material with characteristics of resilience,
possibly associated with an impermeable film and a thin metal foil
with density of at least 150 g/m.sup.2.
[0029] D7 describes a sound material comprising a first layer of
fabric weighing between 200 and 1000 g/m.sup.2, preferably between
350 and 400 g/m.sup.2, a second layer of non woven fabric weighing
between 40 and 200 g/m.sup.2, preferably between 60 and 150
g/m.sup.2, where both the two layers are bonded by a plastic
reticular structure.
[0030] D8 suggests a material to reduce impact noise on a floor. It
is made up of accommodation cavities forecast in a plane next to
the other in a net of non woven polypropylene or polyester, and
silica particles internally distributed in such a way to form a
structure with damping effect.
[0031] D9 describes a structure to isolate the noise between
floors. It is a layered structure, in which below the top layer it
is coated a three-dimensional layer of synthetic threads.
[0032] In the market, there are also known materials in
monofilaments mats used to mitigate the impact noise between
floors. For example, in the site www.colbond-usa.com, Colbond
company describes the product Acousti-Mat II.TM. and III and the
product Enkasonic E.TM.. These are products in nylon filaments
three dimensional mats, with thickness comprised between 6 mm and
20 mm, and with density between 42.6 kg/m.sup.3 and 88
kg/m.sup.3.
[0033] In the site www.keenebuilding.com, Keene Building Products,
describes sound mats for floating floors named Quiet Qurl
55-025.TM., 6 mm thick, and Quiet Qurl 60-040.TM., 10 mm thick,
with a polyester topping joined to a three dimensional
polypropilene extruded threads mat.
[0034] It is therefore reasonable to consider as known a flooring
impact sound deadening membrane, or the membrane or the
multilayered structure, suitable to reduce the impact sound, which
is comprised of at least: [0035] one layer of mat as a three
dimensional extruded polymeric monofilament mat; [0036] a non woven
polymeric tissue; and [0037] a felt joined to a waterproofing
film.
DISADVANTAGES
[0038] The opinion of the applicant is that the above described
devices unlikely meet the requirements to achieve an optimum level
of acoustic comfort.
[0039] More specifically, the state of the art shows like all known
solutions by themselves are not exempt from drawbacks and
limitations in relation to the specified parameters and user
requirements. More in detail, the above described solutions, while
suitable to contain the impact noise level in the disturbed room to
values lower than 70 dB, in the opinion of the applicant, those
solutions are sufficient in itself to reduce the intensity of the
noise levels prescribed by legislation; however, the solutions are
not sufficient to reduce it at levels lower than 55 dB, which
correspond to an optimum acoustic comfort. As to the products used
directly under the floor, there are no solutions that meet the
needs of acoustic comfort.
[0040] It is certainly true that the solution described in D1,
proposed a sound deadening membrane with which it is possible to
obtain normalized impact sound levels of 51 dB in the disturbed
room, with thicknesses between 6 and 20 mm, preferably from 10 to
15 mm. It is defined in particular a critical thickness between 10
and 12 mm, composed by many layers of fibrous materials with low
rigidity containing a great amount of air. These values satisfy the
legislative limits, but they don't allow an adequate margin of
safety like the one obtainable, with thicknesses between 10 and 12
mm, with the object of this invention. In particular for the light
wooden floors, which are the most difficult to solve acoustically,
it is necessary to provide products that can get, in a standard
test, noise levels Lnw below 50 dB in the disturbed room, or an
impact insulation class of at least 60 points.
[0041] For the above described reasons, there is a need for
businesses, particularly in the specific field, to find out
alternative solutions, more effective, compared to the solutions
present in current time market. One purpose of this is invention is
also to overcome the above described disadvantages.
BRIEF SUMMARY OF THE INVENTION
[0042] This and other aims are achieved with this invention
according to the features of the attached claims solving the above
exposed problems by means of a composite material multilayered
membrane, being sound insulating and sound-absorbent, which acts as
sound deadening insulation for noise impacts, mainly but not
exclusively designed to be used in the flooring, and in particular
under the slab in floating floors, with the aim of reducing the
transmission of noise into the below room. This membrane comprises
several layers, which are at least one polymeric monofilament three
dimensional mat, at least one resilient mat, at least one topping
layer of waterproofing, breathable or not, tissue. This
multilayered membrane with a thickness under a weight of 2 kPa of
at least 8 and maximum 15 mm, preferably 10-12 mm, so as to achieve
a normalized noise level in the disturbed room Lnw below 50 dB, or
an impact insulation class of at least 60 points.
[0043] Aims:
[0044] In this way, through the considerable creative contribution
whose effect has achieved a considerable technical progress, some
goals and benefits can be reached.
[0045] A first aim is to achieve a particular impact noise
insulating membrane that can achieve the sound insulation between
consecutive levels of a building, allowing to reduce the disturbing
noises coming from the above room within a level that complies with
the constraints imposed by legislation with a wide safety
margin.
[0046] A second purpose is to provide a solution that can be used
in every application that requires impact noise insulation, where
the weight which urges the structure is less than 500
kg/m.sup.2.
[0047] A third purpose of the invention is to achieve a very
effective impact sound insulating membrane in a single product
obtained directly in the factory of production without the need for
installation of more materials together or of more layers of
membrane itself.
[0048] A fourth aim is to achieve an effective impact noise
insulating membrane with a waterproofing finishing fabric that can
prevent the penetration of liquid cement or gypsum concrete through
the product during the slab pouring phase, which otherwise might
affect the sound insulation properties of the membrane.
[0049] A fifth goal is to create a membrane, effectively insulating
towards impact noise, with a waterproofing and breathable finishing
fabric, which could bring through its breathability to a more rapid
drying of the slab, lowering the perfection time of the work.
[0050] A sixth objective is to achieve a multilayered membrane,
effectively insulating towards impact noise, with a finishing
fabric larger than the below layers along the entire length of the
roll, with a bituminous or butyl or bi-adhesive curb, protected by
a silicone release paper, which would seal the connections between
different rolls in opera, without the need to give to jobsite staff
specific instructions for installation, or to use more tapes. The
sealing between two consecutively laid down rolls is ensured in
order to avoid, during slab pouring phase, liquid cement or gypsum
penetrating through the joints and affecting the sound deadening
features of the membrane.
[0051] A seventh aim is to achieve a multilayered membrane,
effectively insulating towards impact noise, that can contribute to
thermal insulation of the assembly.
[0052] In particular, it has been possible to obtain a more
integrated and compact structure, with a good technologic content
and relatively low cost. These and other advantages will appear
with the subsequent detailed description of some preferential
solutions, with the help of the attached schematic drawings, whose
details are not to be intended restrictive but only
illustrating.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0053] FIG. 1 is a perspective view of a first solution of
multilayered composite materials membrane.
[0054] FIG. 2 is a perspective view of a second solution of
multilayered composite materials membrane.
[0055] FIG. 3 is another perspective view of a third solution of
multilayered composite materials membrane.
DETAILED DESCRIPTION OF THE INVENTION
[0056] The invention relates to a multilayered composite material
membrane (10, 20, 30), which acts as insulating barrier towards
impact noise, which is composed by multiple layers and in
particular of at least one polymeric monofilament three dimensional
mat (101, 102, 103), at least one resilient mat (201, 202, 203),
with at least one layer of waterproofing, breathable or not, layer
(301, 302, 303), permeable to vapor or not, with a total thickness
under a weight of 2 kPa of at least 8 mm and maximum 15 mm,
preferably between 10 and 12 mm.
[0057] The demonstration of the effectiveness of the solutions
covered by this invention can be easily demonstrated using a
semi-anechoic chamber equipped with sound level meter. The ceiling
of this room consists of a brick cement floor 200 mm thick, the
walls of this room are in 200 mm thick full bricks. The
multilayered impact sound deadening membrane it is laid down on the
top of this ceiling, over it is applied a 50 mm sand cement slab,
metal lathe reinforced, top finished with ceramic tiles. Over the
tiles a normalized tapping machine working. The test is performed
according to EN ISO 717-2 and EN ISO 140-8, adapted in relation to
the size of the receiving room (1000 mm per 1000 mm per 1000 mm)
and the size of the sample in analysis (600 per 600 mm).
[0058] The acoustic performance of the material is measured by the
normalized noise level (Lnw) transmitted in the receiving room or
impact insulation class (IIC). These parameters are calculated
according to the standard on the basis of interpretation of data
acquired by the sound level meter, connected to a microphone
positioned at the center of the receiving room at half of its
height.
[0059] In a first preferred embodiment of the invention (FIG. 1),
it is foreseen that under the 50 mm tiled floating slab weighing
170 kg/m.sup.2, corresponding to a pressure of 1.67 kPa on lay down
the multilayered membrane (10), which is composed by one three
dimensional polypropylene monofilaments, entangled and welded where
they cross, wavy shaped with parallel channels structure mesh
(101), weighing 550 g/m.sup.2, by a needled and resined polyester
mat, with 6 to 18 dtex polyester fibers, (201) weighing 250
g/m.sup.2 and top finished with a low density polyethylene (301)
weighing 50 g/m.sup.2. In such conditions, the transmission of
tapping noise that in the absence of an interposed material is
greater than 80 dB, is reduced to a normalized sound level Lnw of
48 dB, corresponding to an Impact Insulation Class of 62. In this
configuration the multilayered membrane has an apparent dynamic
stiffness of 12 MN/m.sup.3 according to EN 29052.
[0060] In a second preferred embodiment of the invention, (FIG. 2)
it is foreseen that under the 50 mm (1.5'') tiled floating slab
weighing 170 kg/m.sup.2, corresponding to a pressure of 1.67 kPa or
34.82 psf on lay down the multilayered membrane (20), which is
composed by one three dimensional polipropylene threads mesh (102),
entangled and welded where they cross, cuspated shaped, weighing
550 g/m.sup.2, by a needled and resined polyester mat, with 6 to 18
dtex polyester fibers, (202) weighing 250 g/m.sup.2, and top
finished with polypropylene breathable waterproofing membrane (302)
weighing 150 g/m.sup.2. In such conditions, the transmission of
tapping noise that in the absence of an interposed material is
greater than 80 dB, is reduced to a normalized sound level Lnw of
45 dB, corresponding to an Impact Insulation Class of 65. In this
configuration the multilayered membrane has an apparent dynamic
stiffness of 9 MN/m.sup.3 according to EN 29052.
[0061] In a third preferred embodiment of the invention, (FIG. 3)
it is foreseen that under the 50 mm (1.5'') tiled floating slab
weighing 170 kg/m.sup.2, corresponding to a pressure of 1.67 kPa or
34.82 psf on lay down the multilayer membrane (30) which is
composed by one three dimensional polipropylene threads mesh (103),
entangled and welded where they cross, cuspated shaped, weighing
550 g/m.sup.2. This three dimensional mesh is comprised between a
sandwich of two mats made up of needled and resined polyester (203a
and 203b), whose polyester fibers are from 6 to 18 dtex, weighing
each one 250 g/m.sup.2, and in which at least one of the polyester
mats are coupled with a waterproofing breathable polypropylene
membrane (303a) 100 g/m.sup.2 weighing. In such conditions, the
transmission of tapping noise that in the absence of an interposed
material is greater than 80 dB, is reduced to a normalized sound
level Lnw of 42 dB, corresponding to an Impact Insulation Class of
68. In this configuration the multilayered membrane has an apparent
dynamic stiffness of 8 MN/m.sup.3 according to EN 29052.
[0062] In the described solutions, multilayered impact sound
deadening membrane (10, 20, 30) is composed by the resilient mat
(201, 202, 203a, 203b) that is a needled and resined polyester
synthetic fibers mat, with 3.3 to 20 dtex fibers and preferably 6
to 17 dtex fibers, and with a total weight comprised between 150 e
to 450 g/m2, preferably comprised between 200 and 300 g/m.sup.2. As
for at least one of the finishing layers, (301 302, 303), it is in
low density polyethilene weighing from 10 to 100 g/m.sup.2.
[0063] Multilayered membrane (10, 20, 30) can have a finishing
layer (301, 302, 303), in waterproofing breathable polypropylene
membrane, weighing from 50 to 200 g/m.sup.2, preferably from 80 to
160 g/m.sup.2 with water penetration resistance higher than 2
meters (mt) of water column according to EN 20811, with a vapor
diffusion coefficient sd comprised between at least 0.01 and at
most 0.05 according to EN ISO 12572.
[0064] Finishing breathable waterproofing layer (301, 302, 303) can
besides be in polyester.
[0065] Furthermore the impact sound deadening membrane (10, 20, 30)
can have a finishing layer in waterproofing breathable membrane
(301, 302, 303) at least 8 cm larger than the other layers along
the entire length of the roll, forming a selvedge equipped with a
minimum 15 mm wide bituminous or butyl or bi-adhesive strip,
protected by a silicone release paper, which is used to seal the
connections between different rolls in opera.
LEGEND
[0066] (10, 20, 30) multilayer impact sound deadening membrane
[0067] (101, 102, 103) three dimensional polypropylene threads mesh
entangled and welded where they cross [0068] (201, 202, 203a, 203b)
resilient mat in polyester fibers [0069] (301, 302, 303) finishing
waterproofing membrane
* * * * *
References