AU2005209589B2

AU2005209589B2 - Production of cladding sheets

Info

Publication number: AU2005209589B2
Application number: AU2005209589A
Authority: AU
Inventors: Trevor CLAYTON; Kishore Sadanand Honavar; Brad Ryan; Graeme Stark
Original assignee: BlueScope Steel Ltd
Current assignee: BlueScope Steel Ltd
Priority date: 2003-04-02
Filing date: 2005-09-07
Publication date: 2010-06-24
Anticipated expiration: 2024-04-02
Also published as: AU2005209589A1

Description

AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): BLUESCOPE STEEL LIMITED Invention Title: PRODUCTION OF CLADDING SHEETS The following statement is a full description of this invention, including the best method of performing it known to me/us: - 2 PRODUCTION OF CLADDING SHEETS The present invention relates to building structures, such as roofs, from roll-formed steel cladding 5 sheets. In particular, the present invention relates to manufacturing roll-formed steel cladding sheets for building structures, such as roofs. 10 The current standard practice for building a roof from roll-formed steel cladding sheets, such as COLORBOND cladding sheets, includes the following steps: 15 (a) roll-forming steel strip unwound from a coil to form a roll-formed profile and thereafter successively square cutting the ends of the roll-formed strip to form a plurality of rectangular sheets of a standard size that are required to build the roof; 20 (b) marking up and thereafter cutting the ends of a number of the rectangular sheets into required shapes for building the roof; and 25 (c) constructing the roof by attaching the remaining standard-size sheets and the cut sheets to a roof frame. In order to construct a typical roof it is 30 necessary to cut approximately 40% of the initial number of standard-size rectangular cladding sheets that are required to build the roof. The cuts required range from straightforward cuts to produce one or more angled corners to more complex cuts to produce irregular shaped sheets. 35 The practice of cutting rectangular cladding sheets results in considerable waste of material and H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 3 requires a considerable amount of time. In addition, occasionally it is necessary to lift rectangular cladding sheets onto roofs to mark up the 5 sheets and then lower the sheets to the ground and cut the sheets into the required shapes. This practice is time consuming and introduces a safety risk in terms of lifting the sheets onto roofs and then lowering the sheets from roofs. 10 An object of the present invention is to provide a method of producing roll-formed steel cladding sheets for building a roof that is more efficient and cost effective and safer than the above-described current 15 standard practice. Another object of the present invention is to provide an apparatus for producing roll-formed steel cladding sheets for building a roof in accordance with the 20 method. According to the present invention there is provided a method of producing a plurality of roll-formed cladding sheets for building a structure, such as a roof, 25 the plurality of cladding sheets including cladding sheets having angled cuts at the ends of the sheets, which method includes the steps of: (a) translating data relating to a design of 30 the structure into a series of cutting operations of a cutting assembly for cutting strip having a roll-formed profile into a plurality of separate cladding sheets that have the 'correct size and shape to be placed directly onto a support frame and assembled together to form the 35 structure; and (b) cutting the roll-formed strip with the H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 -4 cutting assembly in accordance with the cutting operations and forming the plurality of separate cladding sheets. According to the present invention there is also 5 provided a method of marking a roll-formed strip to define at least part of the perimeters of a plurality of cladding sheets for building a structure, such as a roof, the plurality of cladding sheets including cladding sheets having angled cuts at the ends of the sheets, which method 10 includes the steps of: (a) translating data relating to a design of the structure into a series of marking operations of a marking assembly for marking at least part of the 15 perimeters of a plurality of cladding sheets onto a roll formed strip that can be subsequently cut to form separate cladding sheets that have the correct size and shape to be placed directly onto a support frame and thereafter assembled together to form the structure; and 20 (b) marking the roll-formed strip in accordance with the marking operations of the marking assembly and defining at least part of the perimeters of the plurality of cladding sheets that can be subsequently cut to form 25 separate cladding sheets that have the correct size and shape to be placed directly onto an underlying frame and thereafter assembled together to form the structure. Preferably the method described in the preceding 30 paragraph further includes cutting the roll-formed strip on the marked perimeters to form the plurality of separate cladding sheets. Preferably the method includes inputting data 35 relating to the structural design into a computer program that translates the data into the series of cutting or marking operations. H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 5 Preferably the method includes cutting or marking the roll-formed strip while the strip is being processed on a roll-forming line. 5 In this situation, preferably the method includes cutting or marking the roll-formed strip transversely to the longitudinal direction of the strip and not cutting or marking the strip longitudinally. Consequently, in this 10 situation, the cutting or marking operations control only the shape of the front and rear ends (including the corners) of the separate cladding sheets and do not change the maximum width of the separate cladding sheets. 15 Preferably the method includes cutting the roll formed strip into separate cladding sheets using a cutting assembly that is supported in relation to the roll-forming line to move in response to the programmed cutting operations. 20 The cutting assembly may include any suitable cutter, such as a shear cutter, a plasma cutter, and a laser cutter. 25 The cutting assembly may include two or more cutters positioned in relation to the roll-forming line and selectively operable depending on the type of cuts required. 30 Preferably the cutting assembly includes a cutting head that is able to move in the direction of travel of the roll-formed strip being processed on the roll-forming line and/or transversely to the direction of travel. 35 Preferably the cutting head is able to move normal to the general plane of the roll-formed strip being H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 6 processed on the roll-forming line to maintain a constant gap between the strip and the cutting head. Preferably the cutting head is able to rotate to 5 maintain a constant gap between the roll-formed strip being processed on the roll-forming line and the cutting head. Preferably the method includes marking the roll 10 formed strip to define at least part of the perimeters of the smaller separate cladding sheets using a marking assembly that is supported in relation to the roll-forming line to move in response to the programmed marking operations. 15 The marking assembly may be any suitable marking assembly. One such suitable marking assembly includes an 20 array of downwardly directed paint/ink injectors, for example in the form of single shot valves, positioned above a section of the roll-forming line, with the paint/ink injectors being selectively operable in response to the programmed marking operations to discharge 25 paint/ink onto the strip to mark at least part of the perimeters of the separate cladding sheets while the strip is being processed on the line. Preferably the method includes controlling the 30 operation of the cutting assembly in response to the operation of the roll-forming line. Preferably the method includes controlling the operation of the marking assembly in response to the 35 operation of the roll-forming line. Preferably the method includes marking or H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 -7 otherwise branding each cut or marked cladding sheet to identify the sheet so that it can be differentiated by the marked identification from the other cladding sheets that are required to build the structure. 5 By way of example, the cladding sheets may be marked with consecutive numbers. Preferably the same identification marking 10 system, such as consecutive numbers, is used to identify the cladding sheets and to mark the location of each cladding sheet onto a plan of the structure. Preferably the method further includes packing 15 the separate cladding sheets in a predetermined order to facilitate subsequent assembling of the sheets to build the structure. Preferably the method includes packing the cut 20 separate cladding sheets in a stack in reverse order so that the top cladding sheet in the stack is the first sheet in the stack that 'is required for building the structure and each underlying sheet is the next sheet in the stack that is required for building the structure. 25 Preferably the roll-formed strip is a steel strip. The roll-formed cladding sheets may be any 30 suitable profile. For example, the cladding sheets may be corrugated sheets having successive crests and the troughs when viewed in transverse section and one underlap side edge and one overlap side edge. The cladding sheets may also include one or more ribs separated by pans and one 35 underlap side edge and one overlap side edge. There is a wide range of possible options for the H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 8 computer program. The form of the computer program may take into account different factors or prioritise the factors differently depending on whether the overall objective of the program is to: 5 (a) minimise material waste (and therefore optimise the cutting/marking operations to minimise material waste); 10 (b) maximise production rate (and therefore optimise the time required for the cutting and/or marking operations on the roll-formed strip); (c) provide the best layout of cladding sheets 15 for the structure (and therefore optimise the cutting/marking operations to optimise the layout of the cladding sheets for the structure); or (d) a hybrid of two or more of the above options. 20 The factors include, by way of example: (a) the possible combinations of shapes of cladding sheets that can build a structure of a particular 25 design; (b) the possible arrangements of the cladding sheet shapes along the length of a roll-formed strip being processed on a roll-former line, and more particularly the 30 interrelationship of different shapes of cladding sheets along the length of the strip being processed on the line; (c) the roll-form profile and the dimensions of the roll-formed strip being processed on the roll-former 35 line; (d) the interrelationship of (a), (b), and (c), H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 9 and the actual design of the structure and the impact of the direction of the prevailing weather on the selection process; 5 (e) the operating capacity of the roll-forming line; (f) the operating capacity of the cutting/marking assemblies, and more particularly the capacity of the 10 assemblies to cut/mark different shapes of cladding sheets and (g) transportation and materials handling factors (such as maximum length/width that can be packed and 15 transported). With regard to factor (d) above, it is relevant to note that in any given situation the best possible layout of cladding sheets for a particular structure is 20 influenced by (a) the roll-form profile and the dimensions of the roll-formed strip being processed on the roll former line, (b) how the design of the cladding sheet "fits" in relation to the features of the structure design, and (c) the prevailing weather direction in 25 relation to the structure and the effect of weather on the cladding sheet. By way of example, in the case of a structure in the form of a hip roof, there are a number of different 30 arrangements of standard size cladding sheets and cut cladding sheets that can be assembled together to form the hip. One possible consideration for selecting one of the arrangements is the wastage associated with cutting or marking and then cutting the cladding sheets on a roll 35 former line. Another possible consideration is the direction of the prevailing weather - and more particularly selecting the arrangements in which the H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 10 cladding sheets are positioned so that the overlap side edges face away from the prevailing weather direction. Preferably the computer program is capable of 5 generating quotations to supply cladding sheets to build a structure. According to the present invention there is also provided an apparatus for producing a plurality of 10 cladding sheets for building a structure, which apparatus includes: (a) a roll-forming line for roll-forming a flat strip, for example wrapped in a coil, into a roll-formed 15 profile; and (b) a cutting assembly for cutting the roll formed strip into a plurality of separate cladding sheets that have a correct size and shape to be placed directly 20 onto a support frame and thereafter assembled together to form the structure. Preferably the apparatus further includes a control means for controlling the operation of the cutting 25 assembly in response to a computer program and cutting the roll-formed strip into the plurality of separate cladding sheets, the computer program providing a series of cutting operations of the cutting assembly that is derived from data relating to the design of the structure for producing 30 separate cladding that have the correct size and shape to be placed directly onto the support frame and thereafter assembled together to form the structure. The cladding sheets may be any suitable profile. 35 For example, the cladding sheets may be corrugated sheets having successive crests and the troughs when viewed in transverse section and one underlap side edge and one H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 11 overlap side edge. The cladding sheets may also include one or more ribs separated by pans and one underlap side edge and one overlap side edge. 5 Preferably the roll-forming line includes an uncoiler for a coil of strip and a series of roll-forming stands for successively roll-forming strip unwound from the uncoiler into a roll-formed profile. 10 As indicated above, the cutting assembly may include any suitable cutter, such as a shear cutter, a plasma cutter, and a laser cutter. The cutting assembly may include two or more 15 cutters positioned in relation to the roll-forming line and selectively operable depending on the type of cuts required. Preferably the cutting assembly includes at least 20 one cutter that is adapted to cut the roll-formed strip so that cladding sheets have angled cuts at the ends of the sheets. Preferably the cutting assembly includes a 25 cutting head that carries the cutter or cutters and is able to move in the direction of travel of the roll-formed strip being processed on the roll-forming line and/or transversely to the direction of travel. 30 Preferably the cutting head is able to move normal to the general plane of the roll-formed strip being processed on the roll-forming line to maintain a constant gap between the strip and the cutting head. 35 Preferably the cutting head is able to rotate to maintain a constant gap between the roll-formed strip being processed on the roll-forming line and the cutting H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 12 head. Preferably the plurality of cutting sheets for building the structure includes cladding sheets that have 5 angled cuts at the ends of the sheets. According to the present invention there is also provided an apparatus for marking a roll-formed cladding sheet to define the perimeters of a plurality of smaller 10 cladding sheets for building a structure, which apparatus includes: (a) a roll-forming line for roll-forming a flat strip, for example wrapped in a coil, into a roll-formed 15 profile; and (b) a marking assembly for marking the roll formed strip to define at least part of the perimeters of a plurality of separate cladding sheets that can be 20 subsequently cut from the roll-formed strip that have the correct size and shape to be placed directly onto an underlying frame and thereafter assembled together to form the structure. 25 Preferably the apparatus includes a control means for controlling the operation of the marking assembly in response to a computer program that provides a series of marking operations of the marking assembly that is derived from data relating to the design of the structure for 30 facilitating production of separate cladding sheets that have a correct size and shape to be placed directly onto the support frame and thereafter assembled together to form the structure. 35 The roll-formed cladding sheets may be any suitable profile. For example, the cladding sheets may be corrugated sheets having successive crests and the troughs H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 13 when viewed in transverse section and one underlap side edge and one overlap side edge. The cladding sheets may also include one or more ribs separated by pans and one underlap side edge and one overlap side edge. 5 Preferably the plurality of cladding sheets for building the structure includes cladding sheets that have angled cuts at the ends of the sheets. 10 Preferably the apparatus further includes a cutting assembly for cutting the roll-formed strip where marked on the strip for forming the plurality of cladding sheets. 15 The applicant has found in trials carried out with an embodiment of the method of the present invention that it is possible to reduce the labor time required to build roofs by between 20% and 50% and substantially reduce material waste. 20 The present invention is described further by way of example with reference to the accompanying drawing which is a diagram that illustrates one embodiment of an apparatus for producing a plurality of cladding sheets in 25 accordance with the invention. The apparatus shown in the Figure comprises a standard roll-forming line that has been modified to include marking and/or cutting assemblies for marking 30 and/or cutting a roll-formed cladding sheet. With reference to the Figure, flat steel strip is unwound from a coil 5 and passed successively through a series of roll-formers 7 that progressively roll a 35 required profile in the strip. By way of example, the profile may comprise a series of lengthwise extending flat pans separated by upstanding ribs with side edge H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 14 formations to allow adjacent subsequently formed cladding sheets to be positioned in side by side overlapping relationship. The roll-formed strip emerging from the last of the roll-formers is moved past a position sensor 5 17 for sensing the position of the strip, a marking assembly 9, a first cutting assembly 11, and a second cutting assembly 13 in the form of an exit shear. These assemblies 9, 11, 13 are selectively operable to mark and/or cut the roll-formed strip to produce cladding 10 sheets having required shapes. The cladding sheets emerging from the end shear 13 are passed to a sheet handling station 15 and are stacked or otherwise handled as required. 15 The marking assembly 9 is operable to mark the roll-formed strip to define the ends of non-squared cladding sheets. The marked roll-formed strip is subsequently square cut, typically by the end shear 13, outboard of the marked ends of the strip. The marked ends 20 of the cladding sheets can be subsequently cut, for example at a building site, to form cladding sheets with the required shape. The marking assembly 9 is also operable to brand 25 the roll-formed strip to uniquely identify each subsequently cut cladding sheet. The above-described apparatus is controlled by software that: 30 (a) translates design data for a structure, such as a roof of a house, into a series of marking and/or cutting operations of the marking and/or cutting assemblies 9, 11, 13 for marking and/or cutting roll 35 formed strip to form the cladding sheets; and (b) drives the roll-forming line; H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 15 (c) drives the marking and/or cutting assemblies 9, 11, 13 and marks and/or cuts the roll-formed strip to form cladding sheets having the required shapes. 5 The operation of the marking and/or cutting assemblies 9, 11, 13 is responsive to the requirements of the programmed series of marking and/or cutting operations and the actual operation of the roll forming line at any 10 given point in time, as monitored by the sensor 17. Depending on the type of end profile required for a cladding sheet, one or both of the cutting assemblies 11, 13 may be operated. For example, in a number of 15 situations it may only be necessary to square cut the ends of the roll-formed strip. In these situations operation of the exit shear 13 may only be required. In other situations it may be necessary to form angled straight cuts on the ends of the roll-formed strip. In these 20 situations operation of the cutting assembly 11 may be appropriate. In particular, the cutting assembly 11 may include a shear cutter that is operable to move along the length of the roll-former line with the roll-formed strip and form the angled cut during the course of such 25 movement. In other situations it may be necessary to form more complex cuts on the ends of the roll-formed strip. In such situations, operation of both cutting assemblies 11, 13 may be appropriate to complete the cuts. 30 Many modifications may be made to the preferred embodiment of the present invention described above without departing from the spirit and scope of the present invention. 35 By way of example, the embodiment of the apparatus shown in the Figure may further comprise a means for dispensing tap or other suitable material along the H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 16 underside of cut ends of cladding sheets so that any burrs or other projections that are formed in the cutting operation do no damage underlying stacked cladding sheets. H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05

Claims

1. A method of producing a plurality of roll-formed cladding sheets for building a structure, such as a roof, 5 the plurality of cladding sheets including cladding sheets having angled cuts at the ends of the sheets, which method includes the steps of: (a) translating data relating to a design of 10 the structure into a series of cutting operations of a cutting assembly for cutting strip having a roll-formed profile into a plurality of separate cladding sheets that have the correct size and shape to be placed directly onto a support frame and assembled together to form the 15 structure; and (b) cutting the roll-formed strip with the cutting assembly in accordance with the cutting operations and forming the plurality of separate cladding sheets. 20

2. A method of marking a roll-formed cladding sheet to define at least part of the perimeters of a plurality of cladding sheets for building a structure, such as a roof, the plurality of cladding sheets including cladding 25 sheets having angled cuts at the ends of the sheets, which method includes the steps of: (a) translating data relating to a design of the structure into a series of marking operations of a 30 marking assembly for marking at least part of the perimeters of a plurality of cladding sheets onto a strip having a roll-formed profile that can be subsequently cut to form separate cladding sheets that have the correct size and shape to be placed directly onto an underlying 35 frame and thereafter assembled together to form the structure; and H:\angelal\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 18 (b) marking the roll-formed strip in accordance with the marking operations of the marking assembly and defining at least part of the perimeters of the plurality of cladding sheets that can be subsequently cut to form 5 separate cladding sheets that have the correct size and shape to be placed directly onto a support frame and thereafter assembled together to form the structure.

3. The method defined in claim 1 wherein step (a) 10 includes inputting data relating to the structure design into a computer program that translates the data into the series of cutting operations.

4. The method defined in claim 2 wherein step (a) 15 includes inputting data relating to the structural design into a computer program that translates the data into the series of marking operations.

5. The method defined in claim 2 or claim 4 further 20 includes cutting the roll-formed strip on the marked perimeters to form the plurality of separate cladding sheets.

6. The method defined in any one of the preceding 25 claims includes cutting or marking the roll-formed strip while the strip is being processed on a roll-forming line.

7. The method defined in claim 6 includes cutting or marking the roll-formed strip transversely to the 30 longitudinal direction of the strip and not cutting or marking the cladding sheet longitudinally.

8. The method defined in any one of the preceding claims includes cutting the roll-formed strip into 35 separate cladding sheets using a cutting assembly that is supported in relation to the roll-forming line to move in response to the programmed cutting operations. H:\ange1a1\keep\GRM Speci\Bluescope\Method of Producing Cladding Sheets Divisional.doc 7/09/05 - 19

9. The method defined in claim 2 and any one of the preceding claims when dependent directly or indirectly on claim 2 includes marking the roll-formed strip to define 5 the perimeters of the separate cladding sheets using a marking assembly that is supported in relation to the roll-forming line to move in response to the programmed marking operations.

10 10. The method defined in claim 2 and any one of the preceding claims when dependent directly or indirectly on claim 2 includes marking each cut or marked cladding sheet to identify the sheet so that it can be differentiated by the marked identification from the other cladding sheets 15 that are required to build the structure.

11. The method defined in any one of the preceding claims includes packing the smaller separate cladding sheets in a predetermined order to facilitate subsequent 20 assembling of the sheets to build the structure.

12. The method defined in any one of the preceding claims includes packing the cut smaller separate cladding sheets in a stack in reverse order so that the top 25 cladding sheet in the stack is the first sheet in the stack that is required for building the structure and each underlying sheet is the next sheet in the stack that is required for building the structure. 30

13. An apparatus for producing a plurality of cladding sheets for building a structure, which apparatus includes: (a) a roll-forming line for roll-forming a flat 35 strip, for example wrapped in a coil, into a roll-formed profile; and 2250092_2 (GHMatters) 15/04/10 - 20 (b) a cutting assembly for cutting the roll formed strip into a plurality of separate cladding sheets that have a correct size and shape to be placed directly onto a support frame and thereafter assembled together to 5 form the structure, wherein the cutting assembly includes two or more cutters positioned in relation to the roll forming line and selectively operable depending on the type of cuts required, and wherein at least one cutter is adapted to cut the roll-formed strip so that cladding 10 sheets have angled cuts at the ends of the sheets.

14. The apparatus defined in claim 13 further includes a control means for controlling the operation of the cutting assembly in response to a computer program and 15 cutting the roll-formed strip into the plurality of separate cladding sheets, the computer program providing a series of cutting operations of the cutting assembly that is derived from data relating to the design of the structure for producing separate cladding that have the 20 correct size and shape to be placed directly onto the support frame and thereafter assembled together to form the structure.

15. The apparatus defined in claim 13 or claim 14 25 wherein the cutting assembly includes at least one of a shear cutter, a plasma cutter, and a laser cutter.

16. The apparatus defined in any one of claims 13 to 15 wherein the cutting assembly includes a cutting head 30 that carries the cutter or cutters and is able to move in the direction of travel of the roll-formed strip being processed on the roll-forming line and/or transversely to the direction of travel. 35

17. The apparatus defined in claim 16 wherein the cutting head is able to move normal to the general plane of the roll-formed strip being processed on the roll 2250092_2 (GHMatters) 15/04/10 - 21 forming line to maintain a constant gap between the strip and the cutting head.

18. The apparatus defined in claim 16 or claim 17 5 wherein the cutting head is able to rotate to maintain a constant gap between the roll-formed strip being processed on the roll-forming line and the cutting head.

19. The apparatus defined in any one of claims 13 to 10 18 wherein the plurality of cladding sheets for building the structure include cladding sheets that have angled cuts at the ends of the sheets.

20. An apparatus for marking a roll-formed strip to 15 define at least part of the perimeters of a plurality of smaller cladding sheets for building a structure, which apparatus includes: (a) a roll-forming line for roll-forming a flat 20 strip, for example wrapped in a coil, into a roll-formed profile; and (b) a marking assembly for marking the roll formed strip to define at least part of the perimeters of 25 a plurality of cladding sheets that can be subsequently cut from the roll-formed strip that have the correct size and shape to be placed directly onto an underlying frame and thereafter assembled together to form the structure. 30

21. The apparatus defined in claim 20 further includes a control means for controlling the operation of the marking assembly in response to a computer program that provides a series of marking operations of the marking assembly that is derived from data relating to the 35 design of the structure for facilitating production of separate cladding sheets from the roll-formed strip that have the correct size and shape to be placed directly onto 2250092_2 (GHMatters) 15/04/10 - 22 the support frame and thereafter assembled together to form the structure.

22. The apparatus defined in claim 20 or claim 21 5 further includes a cutting assembly for cutting the roll formed strip where marked on the strip for forming the plurality of the cladding sheets.

23. A method of producing a plurality of roll-formed 10 cladding sheets for building a structure substantially as described herein with reference to the accompanying drawings.

24. An apparatus for producing a plurality of 15 cladding sheets for building a structure substantially as described herein with reference to the accompanying drawings. 2250092_2 (GHMattere) 15/04/10