FIELD OF THE INVENTION

The invention relates to a method, a device and a system for at least partially dismantling a wall. More specifically, the present invention relates to a method, a device and a system for at least partially dismantling a wall having an expanded plastic layer arranged on a structure, in which the expanded plastic layer is removed from a structure in the form of a wallboard, such as a wind protection board, gypsum wallboard, chipboard, fiber board, veneer sheet, mineral fiber board or similar, or in the form of a concrete wall or similar.

Expanded plastic layers are used for supporting render layers of walls, wherein the expanded plastic layer functions as a render supporting insulation layer. Walls having a render layer supported by a render supporting insulation layer without an air gap is called insulated, rendered and unventilated walls. Such render supporting insulation layers comprise, for example, rigid insulation in the form of mineral wool or expanded plastic, such as expanded polystyrene (EPS) or similar. In such walls the render layer has, for example, been applied directly on the render supporting insulation layer.

This type of method, device and system is, for example, intended to be used in connection with renovation, reparation or change of a rendered wall where the render is arranged on a render supporting layer of expanded plas- tic while forming an insulated and unventilated exterior wall of a house.

PRIOR ART

Insulated, rendered and unventilated exterior walls have been found to result in a considerable risk of moisture damage. If moisture enter the wall it will take time before the moisture has dried out, which can result in mould growth and fungus. In addition, the moisture invalidates energy calculations and impairs the k-values. There is a plurality of possible reasons for the moisture damages in insulated, rendered and unventilated walls, such as the presence of moist material from the outset, penetration of water during construction, condensation inside the wall and leakage of rain water. The conse- quences of the moist damages can be severe as the drying possibilities of such walls are limited.

Hence, during a period of time a building technique has been used on houses and buildings which mean that the house body is covered by ex- panded plastic and some type of finishing. In such cases, the expanded plastic is glued directly on a construction board or cover board which can be comprised of gypsum or wood chips and is attached to an insulated frame work. In this type of structure no traditional air gap is present which has resulted in that moisture within the facade cannot exit. The moisture stays in the wall structure and forms mould and decay.

Corresponding problems exist also in stone houses when a similar facade cladding method has been used. The moisture is drawn into the base structure and further into the walls of the house. If the house is not sufficiently ventilated the moisture stays in the walls and can cause mould growth and cause allergy.

The most common known method to remedy said problem is simply to tear down or dismantle the entire wall from the finishing structure and down to the frame work and the bearing structure. Regardless of only a minor part of the house being damaged all materials are removed. Then, visual inspec- tion is made for further dismantling and replacement of damaged portions. This is a labor-intensive method which results in considerable environmental impact and poor working environment. Dismantling according to prior art results in large amounts of small parts and dust of render and expanded plastic, which impairs the working environment and causes littering of the imme- diate surroundings. Generally, a wind foil or wind cardboard within the construction board is also damaged.

A drawback of methods for at least partially dismantling a wall having an expanded plastic layer arranged on a structure according to prior art is that they are labor-intensive.

A problem with such prior art methods is that they result in a considerably negative environmental impact and poor working environment. One further problem with such prior art methods is that they are expensive.

One further drawback of such prior art methods is that they are inefficient.

SUMMARY OF THE INVENTION

An object of the present invention is to avoid the drawbacks and problems of the prior art. The method, device and system according to the inven- tion result in improved working environment and facilitates the sorting of waste materials when dismantling a wall. The invention also results in a less labor-intensive, more eco-friendly and cost efficient renovation of moisture damaged facades of, for example, insulated, rendered and unventilated exterior walls. The invention results in considerably shortened working time for removing a fagade or parts of a fagade. The invention also results in considerable material savings. In addition, the invention results in considerably less littering during dismantling of the different layers of a fagade. In addition, damage to the fagade will be considerably less than when conventional methods are used. Further, covering the house with tarpaulins or similar is not required to the same extent to prevent littering and dust spreading.

The present invention comprises a method for at least partially dismantling a wall having an expanded plastic layer arranged on a structure, characterised by the steps of

arranging a first groove at least partially through the expanded plastic layer,

arranging a second groove at least partially through the expanded plastic layer and at a distance from the first groove, and

cutting, by means of a heating wire, from the first groove to the second groove along a plane of the expanded plastic layer and through a portion of the expanded plastic layer arranged at the structure.

The method according to the invention can also comprise the steps of arranging at least the second groove with a width substantially corresponding to or being larger than an arm supporting the heating wire, bringing the heat- ing wire to the portion of the expanded plastic layer being arranged at the structure, and introducing the arm supporting the heating wire into the second groove and convey said arm along said groove while bringing the heating wire along the portion of the expanded plastic layer at the structure to cut off at least a substantial part of the expanded plastic layer from the structure by melting. The grooves can be arranged through the expanded plastic layer and through a render layer arranged on the expanded plastic layer. The render layer can be removed before or simultaneously with removing the expanded plastic layer.

Removing the expanded plastic layer from the wall generally includes a plurality of steps.

Step 1

The outer layer of the facade can be cut with a grooving machine in the form of an immersion saw or a grooving saw to a depth in which the ex- panded plastic is attached to the structure. The grooving machines can be provided with specifically adapted diamond blades having a grooving width of, for example, 1-20 mm, 2-10 mm, 3-5 mm and for example around 4 mm, so that the heating wire can fit. The grooving machines can be provided with a connection to a dust collector to avoid spreading dust particles during dis- mantling.

Initially, one can suitably start with machining off corners and manually dismantle these. Plate coverings and other objects can also be removed. One can also saw with the grooving machines along the base of the roof, around windows and at the facade base if required. Then, the wall can be provided with a plurality of grooves, which can be substantially in parallel. For example, the wall is provided with grooves, so that a distance between the grooves does not exceed the length of the heating wire and thus form sections not being wider than the length of the heating wire. For example, the grooves can be arranged vertical, horizontal or as a grid.

Step 2 When required the render layer can be removed from the expanded plastic layer before the expanded plastic layer is removed from the structure. The grooves are, for example, arranged through the expanded plastic layer and the render layer arranged on the expanded plastic layer, after which the render layer can be pulled off from the expanded plastic layer in sections being delimited substantially by the grooves. Hence, the render layer can be separated from the wall for further processing, sorting or deposit. For example, sections of the render layer are pulled off from the expanded plastic layer manually.

Step 3

For example, expanded plastic layers in the form of EPS boards and similar can be connected to the structure by means of fastening devices arranged through the expanded plastic layer. Any fastening devices are exposed when the render layer or sections thereof are removed. The exposed fastening devices for connecting the expanded plastic layer to the structure are removed if required. For example, fastening devices arranged through the expanded plastic layer can be screwed out or pulled out by means of a suitable tool, such as a screwdriver, power drill, claw wrench or similar.

Step 4

To remove the expanded plastic layer the heating wire or a thermo knife is used and sometimes also chemicals for dissolving or melting the expanded plastic. For example, the expanded plastic is removed by means of the heating wire to form sections of the expanded plastic layer, wherein the expanded plastic layer can be subject to waste sorting and can be taken care of in an environmentally friendly and efficient way.

Step 5

After dismantling there can be remains of adhesive and 1-2 mm expanded plastic. If this has to be removed this can be achieved by means of the heating wire or the thermo knife or by means of a solvent, such as ace- tone or methyl ethyl ketone. The surface can also be cleaned by means of a grinding machine, which can be connected to a dust collector for collecting dust in a conventional manner. When this optional step of the method has been performed inspection and moisture search can be performed before further measures are taken.

In certain cases inspection and moisture search, such as by means of conventional moist measuring methods, result in that one or more of the boards on the structure, such as gypsum boards or chipboards, must be replaced. Step 4 and step 5 as above exposes the fastening means connecting the structure to a frame work, after which the fastening means can be removed. For example, the fastening means are removed by means of a ma- chine for removing the fastening means through mechanical machining, such as by milling or sawing. After removing the fastening means the structure or parts thereof can be removed from the frame work for further processing, such as waste sorting.

The invention also relates to a device for removing an expanded plas- tic layer from a structure when at least partially dismantling a wall, characterised in that the device comprises a body having a first arm projecting from said body, a projecting second arm arranged at a distance to the first arm, and a heating wire, extending between the arms, for cutting expanded plastic by melting, wherein the heating wire is arranged at a distance to the body by means of the arms while forming a space between them for receiving at least a substantial part of a thickness of the expanded plastic layer during cutting through a portion of the expanded plastic layer adjacent to the structure. Hence, the space is arranged so that the body can be conveyed outside the expanded plastic layer while the heating wire, through the arms, simultane- ously can be conveyed within the expanded plastic layer, at the construction board or through a portion of the expanded plastic layer at the construction board.

The heating wire can be arranged at a distance from the body substantially corresponding to or being larger than a total thickness of the expanded plastic layer and the render layer arranged thereon, so that the body can be conveyed outside the render layer while the heating wire, through the arms, can be conveyed within the render layer and through the expanded plastic layer at the construction board.

The invention also relates to a system for at least partially dismantling a wall having an expanded plastic layer arranged on a structure, character- ised in that the system includes a grooving machine having a blade for cutting through the expanded plastic layer and a render layer arranged thereon, and a device according to the above, wherein the width of the blade corresponds to or is larger than a width of at least the second arm of the device.

The wall can be an insulated and unventilated wall, such as a ren- dered, insulated and unventilated frame work wall, wherein the structure is a construction board in the form of a gypsum board, chipboard or similar. Alternatively, the wall can be another type of insulated, unventilated wall, such as an insulated, unventilated stone wall, wherein the structure is stone or concrete.

Further characteristics and advantages of the present invention will become apparent from the description of the embodiments below, the appended drawings and the dependent claims.

SHORT DESCRIPTION OF THE DRAWINGS

The invention will now be described more in detail with the aid of embodiments and with reference to the appended drawings, in which

Fig. 1 is a schematic cross section view of a rendered, insulated and unventi- lated frame work wall,

Fig. 2 is a schematic view of a device for removing an expanded plastic layer from a structure according to one embodiment of the present invention, Figs. 3-10 is a schematic series of figures showing removal of a render supporting expanded plastic layer and a render layer arranged on the expanded plastic layer from a structure in the form of a rendered, insulated and unventilated wall according to one embodiment of the present invention, and Figs. 11-14 is a schematic series of figures showing removal of a render supporting expanded plastic layer and a render layer arranged on the expanded plastic layer from a rendered, insulated and unventilated wall accord- ing to one alternative embodiment of the present invention.

THE INVENTION

Referring to Fig. 1 a rendered, insulated and unventilated wall 10 is il- lustrated schematically, the wall 10 comprising a render layer 11 , a render supporting expanded plastic layer 12, a structure in the form of a gypsum board 13, insulation 14, latches 15, optionally a sealing layer 16 and an interior board 17. The wall 10 comprises, for example, further layers, such as web, adhesive, wind barrier, vapour barrier and similar in a conventional manner. The render layer 11 is, for example, arranged directly on the expanded plastic layer 12 or through a web, such as woven glass, being attached to the expanded plastic layer by means of an adhesive in a conventional manner. The expanded plastic layer 12 is, for example, arranged directly on the construction board 13. The construction board 13 is, for exam- pie, a wind protection board, gypsum board, chipboard, fiber board, veneer board, mineral fiber board or similar. The construction board 13 is, for example, arranged on latches 15 through wind cardboard or similar. The latches 15 form a conventional frame work of wooden or metal latches. Hence, the wall 10 is, for example, a rendered, insulated and unventilated frame work wall. Alternatively, the wall 10 comprises a stone wall, wherein the expanded plastic layer 12 and the render layer 11 are arranged on the stone wall, wherein the stone wall forms the structure for supporting the expanded plastic layer 12.

Referring to Fig. 2 a device 18 for removing the expanded plastic layer 12 from the construction board 13 is illustrated. According to one embodiment of the invention the device 18 is arranged for removing only the expanded plastic layer 12. According to one alternative embodiment of the invention the device 18 is arranged for removing the render supporting expanded plastic layer 12 and the render layer 11 arranged on the expanded plastic layer 12 from the structure of the wall 10. For example, the device 18 is arranged for use in the dismantling of a wall 10.

The device 18 comprises a body 19, a first arm 20 projecting from the body 19, a second arm 21 arranged at a distance from the first arm 20 and a heating wire 22 extending from the first arm 20 to the second arm 21. For example, the arms 20, 21 project substantially perpendicular and in parallel from the same side of the body 19, wherein a first end of each arm 20, 21 , is connected to the body 19 and wherein a second end of each arm 20, 21 is connected to the heating wire 22. The heating wire 22 is, for example, fas- tened at the very end of each arm 20, 21. By means of the arms 20, 21 the heating wire 22 is arranged at a distance from the body 19 to form a space 23 between them for receiving the expanded plastic layer 12. Hence, the heating wire 22 is arranged at a distance from the body 19 corresponding to or being larger than a thickness of the expanded plastic layer 12. Alternative- ly, by means of the arms 20, 21 the heating wire 22 is arranged at a distance from the body 19 so that the space 23 is arranged for receiving the expanded plastic layer 12 and the render layer 11 arranged thereon. Hence, the heating wire 22 is arranged a distance from the body 19 corresponding to or being larger than a total thickness of the expanded plastic layer 12 and the render layer 1 , which is described in more detail below.

For example, the device 18 is provided with or is connected to a transformer, for example generating a voltage of 8-24 volts depending on the length and thickness of the heating wire 22. For example, the body 19 connects the included components. For example, the body 19 is made of an in- sulating material and has a length and thickness dimensioned after the material to be processed. On the body 19 a switch box 24 is fitted, which connects the transformer with the heating wire 22 through a switch 25. The switch 25 is, for example, spring biased and can, for example, be activated by a thumb or index finger. The device 18 is, for example, connected to or connectable to the transformer through a contact 26. Alternatively, the device 18 is battery operated. According to the illustrated embodiment the device 18 comprises a handle 27, wherein the device 18 is arranged as a hand tool to be held by a person and operated manually. Alternatively, the device 18 is arranged in a stand or similar having movable parts for automatic or manual operation of the device 18.

The transformer conducts power to the arms 20, 21 through the switch 25 on the body 19. The arms 20, 21 , or at least the second arm 21 , is, for example, arranged with a width of 1-20 mm, 2-10 mm, 3-5 mm or, for example, about 4 mm. The arms 20, 21 are further arranged with a rigidity to hold the heating wire 22 in tension between them. For example, the arms 20, 21 are hollow and tapered in a direction towards its outer end. For example, one end of the heating wire 22 is fastened in the top part of the body 19 through a tension bolt. The heating wire 22 extends inside the arms 20, 21 in a tube until it contacts a tip 28 when exiting the tube through a slide surface or a needle bearing. For example, the voltage is transferred from the transformer to the heating wire 22 in the tip 28.

In the other end of the heating wire 22 a tension spring 29 is fitted, which is fastened on the opposite side of the body 19. The spring 29 is arranged for compensating extension of the heating wire 22 when it is heated and cooled. The spring 29 is, for example, fastened to the end of the body 19 on the top of the body 19. On this side the heating wire 22 extends as on the other side through the tube and out through the narrow tip. The heating wire 22 is connected between the arms 20, 21 and is tensioned through a tension bolt on the other side, for example.

Referring to Figs. 3-10 a method of at least partially dismantling a wall

10 by removing the render layer 11 and the expanded plastic layer 12 from the structure 13 of the wall 10 is schematically illustrated according to one embodiment of the present invention. In the illustrated embodiment the wall 10 is a rendered, insulated and unventilated frame work wall, wherein the structure is a construction board 13, such as a gypsum board or chipboard. Hence, the method is, for example, arranged for at least partially dismantling a rendered, insulated and unventilated wall, such as for renovation due to moisture damages or for moisture inspection. Alternatively, the wall 10 is a concrete or stone wall provided with at least the expanded plastic layer 12 and the render layer 11 , wherein the structure is concrete or stone. Alternatively, the wall 10 is another type of wall having an expanded plastic layer 12 arranged on a structure. Alternatively, the wall 10 is a wall having a render supporting expanded plastic layer 12 arranged on a structure.

Generally, the method is based on peeling off the expanded plastic layer of the facade by means of the device 18. To reach the construction board 13, which the expanded plastic layer 12 is connected to, grooves hav- ing the desired depth are arranged by means of one or more grooving machines having a blade, such as a diamond blade, penetrating the render layer 11 , the reinforcement of the render and the expanded plastic layer 12. The grooving machine is, for example, arranged to provide a groove by sawing or milling. For example, the grooving machine is arranged as a circular saw or any other type of saw. The grooving machine is, for example, connected to a dust collector having a filter to prevent mould and hazardous materials from spreading.

According to the illustrated embodiment a portion of the expanded plastic layer 12 and the render layer 11 is initially removed to form a recess or a first groove 30 in the wall. For example, a portion of the expanded plastic layer 12 and the render layer 11 is initially removed in a corner of the wall, as illustrated in Fig. 3. This is for example achieved by arranging the first groove 30 in the wall 10 or facade by means of the grooving machine. For example, the first groove 30 is arranged from a top portion of the wall 10 to a bottom portion of the wall and extends, for example, substantially vertical. Suitably, another groove is arranged by means of the grooving machine in a corresponding manner on the other side of the corner, which is not illustrated in the drawing, wherein the corner can be broken off and removed, cut off by means of a thermo knife having a heating wire, sawed off by means of a saw or similar. For example, the thermo knife is a conventional thermo knife having a blade that can be heated and, for example, can be used where the device 18 according to the invention cannot reach. Alternatively, the first groove 30 is not arranged at a corner but at any suitable location on the wall 10. Al- ternatively, a portion of the expanded plastic layer 12 and the render layer 11 is removed along a portion of the wall in any suitable location to form the first groove 30.

In a corresponding manner as the first groove 30 a second groove 31 is arranged at a distance from the first groove 30, as illustrated in Fig. 4. For example, the second groove 31 is arranged by means of the grooving machine. For example, the distance between the first and second grooves 30, 31 is 50-1500 mm, rather 300-1200 mm, rather 500-1000 mm and, for example, about 700 mm. The second groove 31 is, for example, arranged substan- tially in parallel to the first groove 30. Alternatively, the first and second grooves 30, 31 are arranged substantially horizontal along at least a portion of the wall 10. For example, also additional grooves are arranged in a similar manner as the first and second grooves 30, 31 , wherein a third groove 32 is arranged at a distance from the second groove 31 and a fourth groove 33 is arranged at a distance from the third groove 32, as illustrated in Fig. 5. The grooves 30, 31 are, for example, arranged substantially vertical, horizontal or both vertical and horizontal to form a grid.

After arranging at least the second groove 31 the render layer 11 between the first and second groove 30, 31 is removed, as illustrated in Fig. 5. For example, the render layer 11 is pulled off manually after arranging the grooves 30-33 through the render layer 11 and the expanded plastic layer 12. For example, the render layer 11 is removed in sections substantially corresponding to a surface between the grooves 30-31 for simple and environmentally friendly processing. In Fig. 5 the removal of a first section 34 of the render layer 11 is illustrated. In Fig. 6 also a second and third section of the render layer 11 have been removed.

Sometimes the expanded plastic layer 12 is connected to the construction board 13 by means of fastening devices 35 in the form of screws or similar, as illustrated in Fig. 5. The fastening devices 35 are generally exposed when the render layer 11 is removed. If fastening devices 35 are arranged through the expanded plastic layer 12 these are removed. For example, the fastening devices 35 are removed by means of a suitable tool. The fastening devices 35 have been removed in Fig. 6.

After arranging the second groove 31 , after removing the render layer 11 or at least a section 34 thereof and after removing any fastening devices 35 the heating wire 22 is brought to an inner portion of the expanded plastic layer 12, wherein the device 18 can be conveyed along the grooves 30, 31 , as illustrated in Fig. 7 and Fig. 8. For example, the device 18 is brought to one end of the grooves 30, 31 , such as an upper or lower end of the wall 10. The heating wire 22 is brought to a portion of the expanded plastic layer 12 adjacent the construction board 13, so that the heating wire 22 extends between the grooves 30, 31. Additional grooves extending between the first and second grooves 30, 31 can be arranged in the wall, through which the heating wire 22 can be brought into a portion of the expanded plastic layer adjacent the construction board 13. Then, the device 18 is conveyed along the wall 10, as illustrated by means of the arrow A in Fig. 7 and Fig. 8, so that the heating wire 22 cuts through an inner portion of the expanded plastic layer 12 at the construction board 13 while the second arm 21 of the device 18 is brought into and along the second groove 31. Hence, at least the second groove 31 is arranged with a width for receiving the second arm 21 of the device 18, which is provided with the top 28, so that the second arm 21 can be introduced in the second groove 31 and can be conveyed along it. Hence, the blade of the grooving machine is arranged with a width corresponding to or being larger than at least the width of the second arm 21. The width of the blade is arranged so that the top 28 of the device 18 can enter the groove 31. The grooving machine carrying the blade is, for example, provided with a structure so that the desired depth can be set after the thickness of the expanded plastic layer 12 and the render layer 11. For example, there is provided a connection for a dust collector to prevent grinding dust from spreading in the air.

As particularly evident from Fig. 8, the arms 20, 21 are arranged with a length so that the heating wire 22 substantially can reach the construction board 13 and to form the space 23 between the body 19 and the heating wire 22 through which the expanded plastic layer 12 can pass. Hence, the length of the arms 20, 21 substantially corresponds to or is larger than a thickness of the expanded plastic layer 12, wherein a distance between the heating wire 22 and the body 19, i.e. a depth of the space 23, is larger than said thickness. For example, the length of the arms 20, 21 is adjustable, wherein a depth of the space 23 is adjustable to be adapted after current thickness of the expanded plastic layer 12.

The device 18 is brought along the wall 10 and along the grooves 30, 31 , for example from a first end of the grooves 30, 31 to a second end of the grooves 30, 31 , wherein the heating wire 22 cuts through the expanded plas- tic layer 12 until a first portion or a first section 37 of the expanded plastic layer 12 can be removed, as illustrated in Fig. 9. Then, the first section 37 is removed from the structure or the construction board 13. Then, the procedure is repeated, so that additional portions or sections of the facade of the wall 10 are removed, as illustrated in Fig. 10. For example, the third groove 32 is arranged at a distance from the second groove 31 , after which the heating wire 22 of the device 18, for example at an end of the grooves 31 , 32, is brought to a portion of the expanded plastic layer 12 at the construction board 13, wherein the device 18 is brought along the wall 10 while the second arm 21 of the device 18 is introduced into the third groove 32 and the heating wire 22 cuts through the expanded plastic layer 12. Hence, a second section 38 of the expanded plastic layer 12 is cut off from the construction board 13 and is removed.

Referring to Figs. 11-14 an alternative method for removing the expanded plastic layer 12 is described schematically, in which the render sup- porting expanded plastic layer 12 and the render layer 11 arranged on the expanded plastic layer 12 are removed from the structure of the wall 10 simultaneously. The method comprises the steps of initially arranging grooves 30, 31 in a corresponding manner as described with reference to Fig. 3 and Fig. 4, wherein a portion of the expanded plastic layer 12 and the render lay- er 11 is removed, forming recesses in the form of the first groove 30 and the second groove 31 in the wall 10. Optionally, additional grooves are arranged in the wall. After arranging the second groove 31 the heating wire 22 is brought behind the render layer 11 and to an inner portion of the expanded plastic layer 12, wherein the device 18 can be conveyed along the grooves 30, 31 in a corresponding manner as described above. The heating wire 22 is brought to a portion of the expanded plastic layer 12 at the construction board 13, so that the heating wire extends between the grooves 30, 31. The device 18 is then brought along the wall 10, as illustrated by means of the arrow A in Fig. 11 and Fig. 12, so that the heating wire 22 cuts through an inner portion of the expanded plastic layer 12 at the construction board 13 while the second arm 21 of the device 18 is brought into and along the second groove 31. The grooving machine for arranging the grooves 30, 31 is, for example, provided with a structure so that the desired depth can be set in accordance with the thickness of the expanded plastic layer 12 and the render layer 11.

As particularly evident from Fig. 11 the arms 20, 21 are arranged with a length so that the heating wire 22 substantially can reach to the construction board 13 and to form the space 23 between the body 19 and the heating wire 22 through which the expanded plastic layer 12 and the render layer 11 can pass. Hence, the length of the arms 20, 21 is larger than a total thickness of the expanded plastic layer 12 and the render layer 11 , wherein a distance between the heating wire 22 and the body 19, i.e. a depth of the space 23, is larger than said thickness. For example, the length of the arms 20, 21 is adjustable, wherein a depth of the space 23 is adjustable to be adapted to current thickness of the expanded plastic layer 12 and the render layer 11.

The device 18 is brought along the wall 10 and along the grooves 30, 31 , for example from a first end of the grooves 30, 31 to a second end of the grooves 30, 31 , wherein the heating wire 22 cuts through the expanded plastic layer 12 until a first section or a first portion 39 of the facade of the wall 10, i.e. the cut off portion of the expanded plastic layer 12 and the render layer 11 , can be removed, as illustrated in Fig. 13. Then, the first portion 39 is re- moved from the structure or the construction board 13. Then, the procedure is repeated, so that additional portions or sections of the facade of the wall 10 can be removed, as illustrated in Fig. 14. For example, the third groove 32 is arranged at a distance from the second groove 31 , after which the heating wire 22 of the device 18 is brought to a portion of the expanded plastic layer 12 at the construction board 13, for example at one end of the grooves 31 , 32, wherein the device 18 is brought along the wall 10 while the second arm 21 of the device 18 is introduced into the third groove 32 and the heating wire 22 cuts through the expanded plastic layer 12. Hence, a second section or a second portion 40 of the expanded plastic layer 12 and the render layer 11 arranged thereon is cut off from the structure and is removed.

If one cannot use the device 18, such as around windows 41 , doors and similar, the thermo knife can be used as described above to remove por- tions of the facade. If the device 18 cannot be used chemicals can be used, for example. Chemicals, such as acetone, methyl ethyl ketone (MEK) or similar, dissolving the expanded plastic, is, for example, used to remove remains of expanded plastic if required and when the use of chemicals is considered to be the best option. The chemicals are applied behind the render layer and dissolve the expanded plastic.

Optionally, the removal of the expanded plastic layer 12 is followed by grinding to remove any remains of adhesive and any remains of the expanded plastic layer 12. The removal of the expanded plastic layer 12 and any subsequent grinding expose fastening means 42, connecting the structure 13 with the latches 15. The fastening means 42 are, for example, conventional screws or nails for fastening a structure in the form of gypsum board, chipboard or similar to a frame work of latches 15. When considered suitable to remove the structure 13 or portions thereof, such as for moisture measurements, inspection or similar, the fastening means 42 are removed, wherein the structure 13 can be dismantled and further processed. For example, the fastening means 42 are removed by means of a machine for mechanical machining, such as a milling machine or a saw. For example, the milling machine is arranged for milling through the structure 13 or the board, i.e. generally 12-13 mm. After moisture inspection and measures one can provide the facade with suitable insulating and ventilated surface coating.