[0001] The present invention relates to a fastening device for a wall construction mounted
on a supporting surface of a wall support and comprising an insulation layer and a
plaster layer. The invention furthermore relates to a wall construction comprising
a plurality of such fastening devices.
[0002] Plaster is a commonly used wall covering which has been used for a long time throughout
the world. Such a wall covering can be realized in a number of different ways. In
some climatic zones, insulation is also needed. Therefore, plastered wall covering
systems can be quite complex.
[0003] A traditional wall covering includes a mineral, high-build plaster on masonry. Such
a construction gives a moistureproof, energy efficient, durable wall-covering associated
with high comfort.
[0004] Lately, wall constructions using wooden or metal bolts have increasingly been covered
by plaster. When combined with a layer of insulation directly on the underlying wall
construction, on top of which the plaster is applied, a well insulated, compact, plastered
wall construction is achieved. However, moisture entering the construction will often
tend to be trapped in the closed construction and therefore potentially lead to damages
due to damp and mildew in the underlying wall construction.
[0005] Wall constructions comprising air- or drainage gaps behind the insulation layer have
been proposed to overcome these problems. In such systems, a wooden or metal framework
is constructed, on the outside of which the insulating layer is arranged with the
air- or drainage gap there between. Lastly, the plaster layer is arranged directly
on the insulation. Such systems solve the problem with moisture, but typically include
complex and expensive fitting systems requiring time consuming installation work and
highly skilled, specialized installation personnel.
[0006] From the French national patent
2523620, a metal framework is known for installing an insulation layer on an existing wall
construction, whereby an air gap is achieved.
[0007] A system for installing an insulation layer in combination with a masonry wall, with
an air gap, is disclosed in
US 3812635.
[0008] The Swedish patent
451478 discloses a fitting for mounting an insulation layer and a plaster net on an existing
wall.
[0009] It is an object of the invention to provide an inexpensive fastening means for a
wall covering which can be used to quickly mount a high-quality wall construction
of the initially described kind, comprising an air gap, an insulation layer and a
plaster layer, with a minimum of educational requirements on the part of the installer.
[0010] Thus, the invention relates to a fastening device suitable for mounting a wall construction
to a supporting surface of a wall support, which wall construction comprises a first
layer of insulation and a second layer of plaster, said fastening device comprising
a first base part, arranged to be permanently fastened to the supporting surface and
in turn comprising an elongated part, arranged to extend out from the supporting surface
when the device is fastened thereto and arranged to engage with a block of insulation
by threading the block onto a free end of said elongated part so that the elongated
part runs through and supports the block; and a second insulation retaining part,
arranged to engage with the base part and when in engagement therewith limit the movement,
in a direction out from the supporting surface, of a block of insulation which is
in engagement with the elongated part, so that such a block is retained on the elongated
part.
[0011] The invention is characterised in that the first part comprises a spacing means arranged,
when the device is fastened to the supporting surface and when the first part is in
engagement with both a block of insulation and the second part, to limit the movement
in a direction towards the supporting surface of the block of insulation, so as to
create an air gap between the supporting surface and the block of insulation.
[0012] In the following, the invention will be described in detail, with reference to exemplifying
embodiments of the invention and to the appended drawings, in which:
Figure 1 is a perspective view of a fastening means according to the invention as
assembled;
Figure 2 is a section view of the fastening means of Figure 1 mounted in a wall construction
according to the invention;
Figures 3-4 are different perspective views of a first base part of the fastening
means of Figure 1;
Figure 5 is a section view of the first base part of Figures 3-4 taken through the
through holes 102;
Figures 6-7 are different perspective views of a second insulation retaining part
of the fastening means of Figure 1;
Figure 8 is a perspective view of a third locking part of the fastening means of Figure
1; and
Figure 9 is a side view of the locking part of Figure 8.
[0013] All figures share reference numerals for corresponding parts.
[0014] Figure 1 shows a fastening device 1 according to the invention, comprising a first
base part 100, a second insulation retaining part 200 and a third locking part 300.
The first part 100 is shown in greater detail in Figures 3-5; the second part 200
in Figures 6-7; and the third part 300 in figure 8-9.
[0015] In Figure 2, the fastening device 1 is arranged in its intended position in a wall
construction, where it is used to mount the said wall construction to a supporting
surface 3 of a wall support 4. The wall support 4 is preferably an existing exterior
wall or an existing exterior wall support structure, for example in the form of a
wooden or metal framework, a construction board or the like, in a building. It is
noted that the wall may also be an interior wall.
[0016] The wall construction to be mounted using the fastening device 1 comprises an insulation
layer 6, preferably in the form of at least one block of mineral insulation, and a
plaster layer 7. Between the surface 3 of the wall support 4 and the insulation layer
6, an air gap 5 is arranged, providing additional insulation and drainage of moisture
from the wall construction. Preferably, a sealing tape or the like is arranged at
the bottom end of the air gap, arranged to lead running water away from the underlying
wall support 4.
[0017] The base part 100 is permanently fastened to the surface 3 of the supporting wall
4, using conventional fastening means suitable for the material of the supporting
wall 4, such as a pair of wood, metal or concrete screws 2. The base part 100 comprises
an elongated part 130 (see Figures 3-5), arranged so that it extends out from the
surface 3 when the base part 100 is fastened to the wall 4. The elongated part 130
is preferably formed as an integral part of the base part 100. The insulation layer
6 of the wall construction is arranged on the elongated part 130 by it being threaded
onto, along the longitudinal direction of the elongated part 130, and hence supported
by the elongated part 130. It is preferred that the length of the elongated part 130
is chosen so that it runs all the way through the insulation 6 and projects out from
the other side of the insulation 6 when the latter is completely threaded onto the
elongated part 130.
[0018] Furthermore, the base part 100 comprises a spacing means arranged to limit the movement
of the insulation 6, which is threaded onto the elongated part 130, in a direction
towards the surface 3, so as to create the air gap 5 between the surface 3 and the
insulation 6.
[0019] The insulation retaining part 200 is in turn arranged to engage with the base part
100, preferably with the elongated part 130 of the base part 100, and when in engagement
therewith to limit the movement of the insulation 6 in the opposite direction, namely
out from the surface 3 when the base part 100 is fastened thereto. Thereby, the spacing
means and the insulation retaining part 200 in combination act to securely retain
the insulation 6 in position at a certain distance from the underlying surface 3 when
the base part is fastened thereto.
[0020] The plaster layer 7 is applied on top of the insulation layer 6, preferably supported
by a conventional plaster net 8, which preferably is made from metal material such
as galvanized steel.
[0021] By using such a fastening device, a high-quality, strong and moisture proof wall
construction can rapidly be erected on an existing support even by an ordinarily skilled
craftsman within the art of plaster wall-covering, having only a minimum of training
in using the present fastening system and without using any special equipment.
[0022] As described in more detail below, the mounting of the wall construction simply involves
the step of fastening the base part 100 to the wall 4 surface 3 using suitable fastening
means 2, applying the insulation 6 by pushing it onto the elongated part 130 until
the insulation abuts the spacing means of the base part 100, applying the insulation
retaining part 200 and finally applying the plaster layer 7 on top of the insulation
layer 6, possibly using a plaster net as described below. The spacing means guarantee
a sufficient air-and drainage gap 5 between the surface 3 and the insulation 6, and
the fastening device 1 can easily be designed with adequate resiliency and strength
for a variety of practical wall covering applications, see below.
[0023] Since the spacing means are integrated into the base part 100, there is no need for
a specific assembly step to provide the air gap 5 such as building a wooden framework
construction or the like on the existing support 4.
[0024] According to a preferred embodiment best shown in Figures 3-5, the spacing means
comprises two walls 110, 120, preferably arranged in parallel to each other and to
the surface 3 when the base part 100 is fastened thereto. The distance between the
two walls defines the air gap 5, and in case several fastening devices 1 according
to the present invention are used in combination with each other, a uniform spacing
between the walls 110, 120 across all fastening devices 1 aids in achieving a plane
final plastered wall surface.
[0025] The walls 110, 120 are preferably separated by distance means, for example in the
form of interior walls 101. It is preferable that both walls 110, 120 have a smallest
diameter, in a direction perpendicular to the elongated part 130, which is at least
5 cm, in order to provide proper support against the surface 3 and the insulation
6. It is also preferred that the distance means are arranged to allow a free air passage
through the air gap 5 between the walls 110, 120.
[0026] According to a preferred embodiment, at least one, preferably at least two, through
holes 102 are arranged in the base part 100 for fastening it to the support 4 surface
3. The through holes 102 are arranged to run through the spacing means of the base
part 100 so that a fastening means 2 can be inserted through each through hole 102
and fastened to the wall 4 without coming into contact with the air gap 5.
[0027] In one preferred embodiment, the through hole or holes 102 are in the form of cylindrical
holes running, in a direction which is perpendicular to the support 4 surface 3 when
the base part 100 is fastened thereto, from one wall 110 to the other 120 and comprising
a respective open end 103 (see Figures 2 and 5), opening out through each respective
wall 110, 120, so that the base part 100 can be fastened to the surface 3 by inserting
the fastening means 2 into the through holes 102 from the top face of the second wall
120, running through both walls 110, 120 via the through hole 102 and down into the
supporting wall 4 material without coming into contact with the air gap 5.
[0028] This way, the fastening means 2 will not come into contact with the potentially moist
environment inside the air gap 5, and hence corrosion problems can be avoided. It
is also possible to dimension the thickness of the different layers of the wall construction
so that the dewpoint falls within the air gap and hence never comes into contact with
the head of the fastening means 2 tucked away in the insulation 6.
[0029] According to a preferred embodiment, the engagement between the elongated part 130
and the insulation retaining part 200 is pivotable, so that the insulation retaining
part 200 can pivot about an axis which is parallel to the supporting surface 3 when
the fastening device 1 is fastened thereto. Such pivotable engagement provides a flexible
support junction for the heavy plaster layer 7, which junction is influenced not only
by the weight of the plaster but also by wind forces etc. When an entire wall construction
is erected using a plurality of fastening devices 1 (see below), the plaster surface
will be roughly level despite this flexibility of the individual support junctions,
since the insulation layer 6 will be held in position relative to the surface 3 by
the plurality of base parts 100.
[0030] It is furthermore preferred that the said engagement between the elongated part 130
and the insulation retaining part 200 is pivotable about a horizontal axis, so that
the plaster layer, if arranged with its centre of gravity outside of the centre of
rotation of the pivotable engagement, can pivot slightly outwards-downwards due to
its gravitational force during and after installation.
[0031] In order to keep the insulation retaining part 200 in position, it is preferred that
a free end of the elongated part 130, arranged away from the spacing means of the
base part 100, comprises a shoulder means in the form of an abutment surface 143 for
limiting the movement of the engaging insulation retaining part 200 towards the surface
3 when the base part 100 is fastened thereto.
[0032] According to a preferred embodiment, the engagement between the elongated part 130
and the insulation retaining part 200 is realized by a mushroom-shaped head 140 at
the free end of the elongated part 130 in combination with a corresponding keyhole-shaped
through hole 210 in the insulation retaining part 200. These are arranged to interact
with each other, so that the head 140 can be inserted through the hole 210 through
a relatively wider part 211 of the hole 210 and then be slid along a relatively narrower
part 212 of the hole 210 so that the walls 142 of the head 140 facing away from the
free end can engage with the walls of the insulation retaining part 200 facing the
opposite way, to thereby limit the movement of the insulation retaining part 200 along
the elongated part 130 in a direction away from the surface 3 when the base part 100
is fastened thereto.
[0033] This way, the insulation retaining part 200 can easily be mounted on the elongated
part 130 by simply threading the through hole 210 over the head 140 and sliding the
insulation retaining part 200 into engagement position as described above. Preferably,
the keyhole-shaped hole 210 is arranged with its relatively wider part 211 below its
relatively narrower part 212 when finally assembled, so that the insulation retaining
part 200 is slid into position by a downwards motion. Furthermore, it is preferred
that the pivotable engagement is realized by a combination of, on the one hand, certain
play between the insulation retaining part 200 and the walls 142 and shoulder means
143, respectively, and, on the other hand, a minimal play between straight side walls
141 of the mushroom-shaped head 140 and the narrower part 212 of the keyhole-shaped
through hole 210, eliminating rotational movement of the insulation retaining part
200 about the longitudinal axis of the elongated part 130 when in engagement. According
to a preferred embodiment, the fastening device 1 furthermore comprises the third
locking part 300, which is arranged to be inserted into the relatively wider part
211 of the through hole 210 after the head 140 has already been inserted into and
in engagement with the hole 210. When thus inserted into, and in proper engagement
with, the through hole 210, the locking part 300 is arranged to limit the movement
of the head 140 in a direction along the relatively narrower part 212 towards the
relatively wider part 211 of the hole 210, and thereby to lock the insulation retaining
part 200 in position in its engagement with the elongated part 130.
[0034] Such an arrangement will provide a secure yet easy to assemble fastening of the insulation
retaining part 200 onto the base part 100. The locking part 300 can be designed for
rapid, secure fastening without use of additional fastening means or special equipment.
[0035] A particularly simple, quickly mountable and fail-proof way of achieving this is
providing the locking part 300 in a form as shown in Figures 8-9, comprising a snap
lock means in the form of a pair of snap legs 310. The locking part 300 can be pressed
through the relatively wide part 211, once the insulation retaining part 200 has been
placed into position on the elongated part 130, until the snap legs 310 engage with
the face of the insulation retaining part 200 facing the surface 3 when the fastening
device 1 is fastened thereto.
[0036] It is furthermore preferred that each snap leg 310 comprises a slanted abutment surface
311 arranged to abut the corresponding abutment surface 143 of the elongated part
130 when the head 140 is in engagement with the hole 210 and when the locking part
300 is snapped into position as described above. The said abutment will then limit
a translational and/or a pivotal motion of the insulation retaining part 200 in relation
to the elongated part 130 in a plane, preferably the vertical plane, perpendicular
to the surface 3 when the fastening device 1 is fastened thereto. This is most clearly
seen in Figure 2, which figure also shows the preferred arrangement according to which
the insulation retaining part 200, because of its pivotable engagement with the elongated
part 130, is free to pivot slightly clockwise (the plaster layer 7 can pivot outwards-downwards
as described above) but not, because of the said abutment with the abutment surface
143, counterclockwise from its original position.
[0037] It is preferred that the abutment surface 143 is in the form of a conical face. This
will provide the above described abutment with the abutment means 311 of the locking
part 300, but it is also possible to choose dimensions of the insulation retaining
part 200 so that a sufficient pivoting of the latter will result in a squeezing action
between insides of the through hole 210 and the abutment surface 143, resulting in
the insulation retaining part 200 being retained in position with a force which is
stronger the more the latter pivots. This will increase the stability of the wall
construction under, for example, heavy wind loads.
[0038] According to a preferred embodiment, a plaster net 8 is positioned on the insulation
retaining part 200 before the locking part 300 is put into position on the insulation
retaining part 200, by bringing the legs 310 of the locking part 300 through a mask
of the net 8 and then into the hole 210. In this case, it is preferred that the locking
part 300 further comprises a shoulder 320 with an abutment surface 322, arranged to
hold the plaster net 8 in position by limiting its movement in a direction away from
the insulation retaining part 200 once in engaging position.
[0039] It is preferred that the shoulder 320 is in the form of a plate with a central through
hole 321. With such an arrangement it is possible, once the base part 100, the insulation
retaining part 200, the plaster net 8 and the locking part 300 are put into position,
to apply the plaster partly through the hole 321 of the locking part 300 into the
space between the insulation retaining part 200 and the locking part 300. This makes
it easier to obtain a complete filling of the plaster around the whole engagement
between the insulation retaining part 200 and the locking part 300.
[0040] This way, the plaster net 8 is fastened to the retaining part 200 in a position outside
of the second part 200 as seen from the supporting surface 3 when the device 1 is
fastened to said surface 3. This will allow the plaster net 8 to be arranged in the
centre of a later applied plaster layer, see below.
[0041] Moreover, it is preferred that the insulation retaining part 200 comprises first
distance means 220, projecting out from its surface facing away from the supporting
surface 3 when the base part 100 is fastened thereto and the insulation retaining
part 200 is in proper engagement with the base part 100. The first distance means
220, which preferably is in the form of a plurality of elongated ribs in order to
provide sufficient and level support, is arranged to support the plaster net 8 when
held by the shoulder 320 of the locking part 300.
[0042] Additionally, the insulation retaining part 200 comprises second distance means 230,
arranged to abut the abutment surface 322 of the shoulder 320, thus holding the locking
part 300 in position in a direction perpendicular to the surface 3 when the fastening
device 1 is properly assembled and fastened. The second distance means 230 are arranged
to project further out from the surface of the insulation retaining part 200 than
the first distance means 220, so as to give rise to a certain space between the first
distance means 220 and the shoulder 320, in which space the plaster net 8 can be securely
held. To this end, it is preferred that said certain distance is between 1 and 4 mm,
in order to hold the plaster net 8 without considerable play.
[0043] It is preferred that at least the base part 100, preferably also the insulation retaining
part 200 and the locking part 300, are manufactured from a plastic material. By a
suitable choice of such plastic material, a fastening device 1 can be achieved with
sufficient strength and resistance to moisture and ageing, as well as being a poor
heat conductor and also providing sufficient resilience for the resulting wall construction
to be able to absorb heavy wind loads etc. Examples of suitable materials include
polyamide.
[0044] When erecting a wall construction according to the present invention, as a first
step, a plurality of fastening means 1 of the above described type are fastened, using
suitable fastening means 2, to the underlying wall 4 surface 3. The built-in spacing
means guarantee an adequate air- and drainage gap 5 between the underlying wall 4
and the insulation layer 6, which in a second step is put into position by simply
pushing blocks of insulation onto the fastening means 1, allowing the respective elongated
part 130 of each fastening means 1 to be pushed through the insulation material until
the insulation 6 abuts the spacing means of the base part 100.
[0045] In a third step, a respective insulation retaining means 200 is put into engaging
position on the mushroom-shaped head of each respective elongated part 130, so as
to completely secure the insulation 6 to the base part 100.
[0046] In a fourth step, a plaster net 8 is arranged on the entire outer surface of the
insulation 6, after which the plaster net 8 and the insulation retaining means 200
are locked in position using a respective locking means 300 on each insulation retaining
part 200.
[0047] Finally, in a fifth step, the plaster layer 7 is applied, in a manner which is conventional
per se, to the whole surface covered by the plaster net.
[0048] The plaster layer is preferably applied in a thickness of between 10-25 mm, more
preferably between 15-18 mm. It is preferred that the first distance means 220 has
such a height so that the plaster net 8 will be retained in the centre of the plaster
layer 7 when plaster is applied from the surface of the insulation layer 6 and outwards.
Thus, it is preferred that the total height of second part 200 including the first
distance means 220 is between 3-15 mm, more preferably between 4-10 mm.
[0049] It is realized that with a wall construction as described above, the plurality of
fastener devices 1 support not only the insulation layer 6 itself, but also the plaster
net 8 arranged on the insulation layer 6, which plaster net in turn, together with
the insulation 6, supports the plaster layer 7.
[0050] Above, preferred embodiments have been described. However, it is apparent to the
skilled person that many modification may be made to the described embodiments without
departing from the basic idea of the invention.
[0051] For example, the insulation retaining part may be attached to the base part in another
way than the one described above. Hence, it may be attached using a screw fastener
instead of a keyhole mechanism, and/or it may be fastened to the distance means of
the base part rather than to the elongated part.
[0052] The spacing means can be formed as a solid block of material instead of two parallel
walls separated by distance walls, as long as the insulation layer can be held at
a constant distance from the supporting wall layer by a plurality of fastening means.
[0053] As a further example among many possible, the locking part may be attached to the
insulation retaining part by means of a press-action or a screw fastener means rather
than a snap lock mechanism. As an alternative, the locking part may be omitted, the
insulation retaining part being designed to be fastened to the base part in some other
way.
[0054] Thus, the invention is not limited to the described embodiments, but may be varied
within the scope of the enclosed claims.
1. Fastening device (1) suitable for mounting a wall construction to a supporting surface
(3) of a wall support (4), which wall construction comprises a first layer of insulation
(6) and a second layer of plaster (7), said fastening device (1) comprising:
a first base part (100), arranged to be permanently fastened to the supporting surface
(3) and in turn comprising an elongated part (130), arranged to extend out from the
supporting surface (3) when the device (1) is fastened thereto and arranged to engage
with a block of insulation by threading the block onto a free end of said elongated
part (130) so that the elongated part (130) runs through and supports the block; and
a second insulation retaining part (200), arranged to engage with the base part (100)
and when in engagement therewith limit the movement, in a direction out from the supporting
surface (3), of a block of insulation which is in engagement with the elongated part
(130), so that such
a block is retained on the elongated part (130),
characterised in that the first part (100) comprises a spacing means arranged, when the device (1) is fastened
to the supporting surface (3) and when the first part (100) is in engagement with
both a block of insulation and the second part (200), to limit the movement in a direction
towards the supporting surface (3) of the block of insulation, so as to create an
air gap (5) between the supporting surface (3) and the block of insulation.
2. Fastening device (1) according to claim 1, characterised in that the fastening device (1) comprises a fastening means for fastening a plaster net
(8) to the second part (200), which plaster net (8) is arranged to cover the insulation
(6) on its side facing away from the supporting surface (3) when the device (1) is
fastened to said surface (3).
3. Fastening device (1) according to claim 2, characterised in that the fastening means is arranged to fasten the plaster net in a position outside of
the second part (200) as seen from the supporting surface (3) when the device (1)
is fastened to said surface (3).
4. Fastening device (1) according to any one of the preceding claims, characterised in that the spacing means comprises two walls (110,120) separated by distance means (101)
and defining the air gap (5) between them, and in that at least one through hole (102), suitable for receiving fastening means (2) for fastening
the first part (100) to the supporting surface (3), is arranged in the form of a cylindrical
hole running from one wall (110) to the other (120) and comprising a respective open
end (103) opening through each respective wall (110,120), so that a fastening means
(2), such as a screw, can be inserted into and arranged to run through both walls
(110,120) via the through hole (102) without coming into contact with the air gap
(5) between the walls (110,120).
5. Fastening device (1) according to any one of the preceding claims, characterised in that the engagement between the elongated part (130) and the second part (200) is pivotable,
so that the second part (200) can pivot about an axis which is parallel to the supporting
surface (3) when the device (1) is fastened to said surface (3).
6. Fastening device (1) according to any one of the preceding claims, characterised in that the free end of the elongated part (130) furthermore comprises a shoulder means (143)
limiting the movement, in a direction towards the support surface (3) when the device
(3) is fastened to the surface (3), of the second part (200) when the elongated part
(130) and the second part (200) engage.
7. Fastening device (1) according to any one of the preceding claims, characterised in that the engagement between the elongated part (130) and the second part (200) is realized
by a mushroom-shaped head (140) at the free end of the elongated part (130), arranged
to engage with a corresponding keyhole-shaped through hole (210) in the second part
(200), so that said free end can be inserted through said through hole (210) through
a relatively wide part (211) of the through hole (210) and consequently be slid along
a relatively narrow part (212) of the hole (210) so that the walls of the mushroom-shaped
head (140) facing towards the spacing means can engage with the walls of the second
part (200) facing the opposite way, to limit the movement of the second part (200)
along the elongated part (130) in a direction away from the supporting surface (3)
when the first part (100) is fastened to the supporting surface (3).
8. Fastening device (1) according to claim 7, characterised in that a the fastening device (1) furthermore comprises a third locking part (300), arranged
to be inserted into the relatively wide part (211) of the keyhole-shaped through hole
(210) when said through hole (210) is in engagement with the mushroom-shaped head
(140) and thereby to limit the movement of the mushroom-shaped head (140) in a direction
along the relatively narrow part (212) towards the relatively wide part (211) of the
keyhole-shaped through hole (210), in turn locking the second part (200) in its engagement
with the free end of the elongated part (130).
9. Fastening device (1) according to claim 8, characterised in that the third part (300) comprises a snap lock means (310) arranged to lock the third
part (300) in place, once pushed through the keyhole-shaped through hole (210), by
engagement between the snap lock means (310) and the face of the second part (200)
facing the support surface (3) when the device (1) is fastened to said surface (3).
10. Fastening device (1) according to claim 9, charac - terised in that the snap lock means (310) comprises an abutment means (311) arranged to abut a corresponding
surface (143) of the elongated part (130) when the mushroom-shaped head (140) is in
engagement with the keyhole-shaped through hole (210) and when the third part (300)
is in engagement with the keyhole-shaped through hole (210) via the snap lock means
(310), so as to limit a translational and/or pivotal motion of the second part (200)
in relation to the elongated part (130) in a plane perpendicular to the supporting
surface (3) when the device (1) is fastened to said surface (3).
11. Fastening device (1) according to any one of claims 8-10, characterised in that the third part (300) comprises a shoulder (320) arranged to limit the movement away
from the second part (200) of a plaster net (8), through the masks of which the third
part (300) is brought before it is inserted into the keyhole-shaped through hole (210)
of the second part (200).
12. Fastening device (1) according to claim 11, characterised in that the shoulder (320) comprises a through hole (321), allowing, when the first (100),
second (200) and third (300) parts are in mutual engagement, plaster to be applied
through the through hole (321) into the space between the second (200) and third (300)
parts arranged to retain the plaster net (8).
13. Fastening device (1) according to claim 11 or 12, characterised in that the second part (200) comprises a distance means (320) projecting out from a surface
of the second part (200) facing away from the supporting surface (3) when the device
(1) is fastened to the supporting surface (3) and when the second part (200) is in
engagement with the first part (100), which distance means (320) is arranged to support
the plaster net (8) when held by the shoulder (320) of the third part (300).
14. Fastening device (1) according to any one of the preceeding claims, characterised in that the first part (100) is manufactured from plastic material.
15. Wall covering, comprising an insulation layer (6) and a plaster layer (7) arranged
on said insulation layer (6), characterised in that the insulation layer (6) is supported by a plurality of fastening devices (1) according
to one or several of claims 1-14, which fastener devices (1) are fastened to a supporting
surface (3) of a wall support (4) and furthermore are arranged to support the insulation
layer (6) so that an air gap (5) is formed between the supporting surface (3) and
the insulation layer (6), and in that the fastener devices (1) are arranged to support a plaster net (8) arranged on the
insulation layer (6), which plaster net (8) in turn supports the plaster layer (7).