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Title:
ROOFING PANEL SYSTEM FOR TOP-DOWN INSTALLATION
Document Type and Number:
WIPO Patent Application WO/2019/097107
Kind Code:
A1
Abstract:
Described is a roofing panel system for top-down installation, wherein the roofing panel system comprising a plurality of panels (1) defining an uphill course of panels (2) and a downhill course of panels (3), and wherein each panel (1) comprising a generally rectangular panel body (4) with a lower edge (5), an upper edge (6), a first side edge (16), a second side edge (17), an outer surface (7), and an inner surface (8), a male interlocking edge (9) at the upper edge (6) of the generally rectangular panel body (4), and a female interlocking edge (10) at the lower edge (5) of the generally rectangular panel body (4), and wherein the female interlocking edge (10) of the panels of the uphill course of panels (2) being configured to receive the male interlocking edge (9) of the panels of the downhill course of panels (3).

Inventors:
TUPALA, Markus (Panuntie 11, Helsinki, 00620, FI)
HUOPANA, Tuomo (Panuntie 11, Helsinki, 00620, FI)
GOLCZYNSKI, Tomasz (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
SOBON, Tomasz (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
FALEK, Przemyslaw (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
PUCEK, Grzegorz (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
DYDA, Michal (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
ORZECHOWSKI, Miroslaw (ul. Jaktorowska 13, 96-300 Zyrardów, 96-300, PL)
Application Number:
FI2017/050796
Publication Date:
May 23, 2019
Filing Date:
November 20, 2017
Export Citation:
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Assignee:
RAUTARUUKKI OYJ (Panuntie 11, Helsinki, 00620, FI)
International Classes:
E04D3/30; E04D1/26; E04D3/16; E04D3/36; E04D3/363; E04D3/365
Foreign References:
US5012623A1991-05-07
US9267289B22016-02-23
PL396691A12013-04-29
US3958387A1976-05-25
US20070068112A12007-03-29
US8915036B22014-12-23
US9267289B22016-02-23
Attorney, Agent or Firm:
BOCO IP OY AB (Itämerenkatu 5, Helsinki, 00180, FI)
Download PDF:
Claims:
Claims

1. Roofing panel system for top-down installation,

wherein the roofing panel system comprising a plurality of panels (1) defining an uphill course of panels (2) and a downhill course of panels (3), and wherein each panel (1) comprising a generally rectangular panel body (4) with a lower edge (5), an upper edge (6), a first side edge (16), a second side edge (17), an outer surface (7), and an inner surface (8),

a male interlocking edge (9) at the upper edge (6) of the generally rectangular panel body (4), and

a female interlocking edge (10) at the lower edge (5) of the generally rectangular panel body (4),

wherein the female interlocking edge (10) of the panels of the uphill course of panels (2) being configured to receive the male interlocking edge (9) of the panels of the downhill course of panels (3),

characterized

by the male interlocking edge (9) extends upwardly in relation to the outer surface (7) of the generally rectangular panel body (4) of the panel (1),

by the female interlocking edge (10) extends downwardly in relation to the inner surface (8) of the generally rectangular panel body (4) of the panel (1),

by the female interlocking edge (10) of the panels of the uphill course of panels (2) being configured to receive the male interlocking edge (9) of the panels of the downhill course of panels (3) in a locking position where a first transversal abutting section (36) of the female interlocking edge (10) abuts a second transversal abutting section (37) of the male interlocking edge (9), and by the female interlocking edge (10) has a protruding edge (31) for snap-effect with the male interlocking edge (9) to releasable retain the male interlocking edge (9) of the panels of the downhill course of panels (3) received in the female interlocking edge (10) of the panels of the uphill course of panels (2) in said locking position.

2. The roofing panel system according to claim 1, characterized

by each panel (1) comprising an offset (11) forming a lower outer surface (12) of the panel

(1),

by the offset (11) extending downwardly from the inner surface (8) of the generally rectangular panel body (4) at the lower edge (5) of the generally rectangular panel body (4), and by the offset (11) being provided between the generally rectangular panel body (4) and the female interlocking edge (10).

3. The roofing panel system according to claim 2, characterized

by each panel (1) comprising a first spring portion (13) between the offset (11) and the female interlocking edge (10), by each panel (1) comprising a second spring portion (14) connected to the female interlocking edge (10) and extending in the direction of the generally rectangular panel body (4) away from the upper edge (6) of the generally rectangular panel body (4) beyond the lower edge (5) of the generally rectangular panel body (4) so that the second spring portion (14) has a first distal free end edge (29), and

by each panel (1) comprising a third spring portion (15) connected to the male interlocking edge (9) and extending in the direction of the generally rectangular panel body (4) towards the lower edge (5) of the generally rectangular panel body (4) so that the third spring portion (15) has a second distal free end edge (30).

4. The roofing panel system according to claim 3, characterized

by the first spring portion (13) of the panels (1) of the uphill course of panels (2) being configured to press against the third spring portion (15) of the panels (1) of the downhill course of panels (3).

5. The roofing panel system according to claim 3 or 4, characterized

by the second spring portion (14) of the panels (1) of the uphill course of panels (2) being configured to press against the inner surface (8) of the generally rectangular panel body (4) of the panels (1) of the downhill course of panels (3).

6. The roofing panel system according to any of the claims 3 to 5, characterized

by the second spring portion (14) being in the direction of the lower edge (5) of the generally rectangular panel body (4) divided into spring sections (18) distanced from each other by an intermediate space (19) between two adjacent spring sections (18), and

by the first side edges (16) of the panels (1) and the second side edges (17) of adjacent panels (1) of the downhill course of panels (3) penetrate into the intermediate spaces (19) between two adjacent spring sections (18) of the panels (1) of the uphill course of panels (2).

7. The roofing panel system according to claim 6, characterized

by the spring sections (18) being connected with a flat fastening strip (20) extending in the direction of the lower edge (5) of the generally rectangular panel body (4), and

by the flat fastening strip (20) and the generally rectangular panel body (4) being essentially plane parallel.

8. The roofing panel system according to any of the claims 3 to 7, characterized

by the second spring portion (14) being provided with openings (27) configured to receive fasteners such as screws.

9. The roofing panel system according to claim 8, characterized

by the openings (27) being provided in a fastening section (34) of the second spring portion (14), and

by the fastening section (34) of the second spring portion (14) being provided at a greater distance from the inner surface (8) of the generally rectangular panel body (4) than a part of the second spring portion (14) that is between the female interlocking edge (10) and the fastening section (34) of the second spring portion (14).

10. The roofing panel system according to any of the claims 3 to 9, characterized

by the protruding edge (31) of the female interconnecting edge (10) adjoining the first spring portion (13).

11. The roofing panel system according to any of the claims 3 to 10, characterized

by the third spring portion (15) of the downhill course of panels (3) being located at least partly outside the female interconnecting edge (10) of the uphill course of panels (2) so that the third spring portion (15) of the downhill course of panels (3) extend beyond the protruding edge (31) of the female interconnecting edge (10) of the uphill course of panels (2) and so that second distal free end edge (30) of the third spring portion (15) of the downhill course of panels (3) being located outside the female interconnecting edge (10) of the uphill course of panels (2).

12. The roofing panel system according to any of the claims 1 to 11, characterized

by the male interlocking edge (9) has a cross-section in the form of the major arc of a circle, and

by the second transversal abutting section (37) of the male interlocking edge (9) being formed at a curved outer surface of the male interlocking edge (9).

13. The roofing panel system according to any of the claims 1 to 12, characterized

by the female interlocking edge (10) has a cross-section in the form of the major arc of a circle,

by the first transversal abutting section (36) of the female interlocking edge (10) being formed at a curved inner surface of the female interlocking edge (10), and

by the protruding edge (31) of the female interconnecting edge (10) being formed by the form of the cross-section of the female interconnecting edge (10).

14. The roofing panel system according to claim 12 and 13, characterized

by the outer diameter of the male interlocking edge (9) corresponding essentially to the inner diameter of the female interlocking edge (10) so that curved inner surface of the female interlocking edge (10) of the panels (1) of the uphill course of panels (2) being configured to press against the curved outer surface of the male interlocking edge (9) of the panels (1) of the downhill course of panels (3).

15. The roofing panel system according to any of the claims 1 to 12, characterized

by the female interlocking edge (10) has a pair of second flanges (32) and a second web portion (33) interconnecting the second flanges (32), and

by the second web portion (33) forming the first transversal abutting section (36) of the female interlocking edge (10).

16. The roofing panel system according to claim 15, characterized

by the male interlocking edge (9) of the panels (1) of the downhill course of panels (3) being configured to press against the second flanges (32) and the second web portion (33) of the female interlocking edge (10) inside the female interlocking edge (10) of the panels (1) of the uphill course of panels (2).

17. The roofing panel system according to claim 16, characterized

by the second flanges (32) being essentially parallel, and

by the second web portion (33) extending essentially perpendicularly with respect to the second flanges (32).

18. The roofing panel system according to any of the claims 1 to 17, characterized

by each panel (1) having a folded-over side edge (21) at the first side edge (16) of the generally rectangular panel body (4) and a folded-under side edge (22) at the second side edge (17) of the generally rectangular panel body (4),

by each folded- under side edge (22) having a first flat flap portion (23), which is essentially plane parallel with the generally rectangular panel body (4),

by each folded-over side edge (21) having a second flat flap portion (24), which is essentially plane parallel with the generally rectangular panel body (4), and an intermediate flat portion (25) between the first side edge (16) of the generally rectangular panel body (4) and the second flat flap portion (24), wherein the intermediate flat portion (25) and the second flat flap portion (24) are essentially parallel, and

by adjacent panels (1) in the uphill course of panels (2) and correspondingly in the downhill course of panels (3) being configured to receive the second flat flap portion (24) of a folded-over side edge (21) of an adjacent panel (1) between the first flat flap portion (23) of a folded-under side edge (22) and the generally rectangular panel body (4) and configured to receive the first flat flap portion (23) of a folded-under side edge (22) of an adjacent panel (1) between the second flat flap portion (24) and the intermediate flat portion (25) of a folded-over side edge (21).

19. The roofing panel system according to claim 18, characterized

by the folded-over side edge (21) extends from the first side edge (16) of the generally rectangular panel body (4) essentially in a plane parallel with the generally rectangular panel body (4) in a direction away from the first side edge (16) of the generally rectangular panel body (4) and away from the second side edge (17) of the generally rectangular panel body (4).

20. The roofing panel system according to claim 18 or 19, characterized

by the folded- under side edge (22) extends from a second side edge (17) of the generally rectangular panel body (4) essentially in a plane parallel with the generally rectangular panel body (4) in a direction towards the first side edge (16) of the generally rectangular panel body (4).

21. The roofing panel system according to any of the claims 18 to 20, characterized

by the outer surface (7) of the generally rectangular panel body (4) is flat,

by the outer surface (7) of the generally rectangular panel body (4) lies in a first plane A, by the folded-over side edge (21) has a flat upper surface (26) that lies in a second plane

B,

by the first plane A and the second plane B are parallel, and

by the distance between the first plane A and the second plane B corresponds to a thickness X of the generally rectangular panel body (4).

Description:
ROOFING PANEL SYSTEM FOR TOP-DOWN INSTALLATION

Field of the invention

The invention relates to a roofing panel system for top-down installation as defined in the preamble of independent claim 1.

Publication US 8,915,036 presents an interlocking panel system for top-down or bottom- up installation on an underlying structure including a plurality of panels, with an uphill course and a downhill course where each panel is generally rectangular, having an uphill edge and opposing downhill edge. An interlocking member is disposed along the uphill edge, and a receiving member adapted to receive the interlocking member and a joining flange are disposed along the downhill edge. A first panel Is positioned on an underlying structure. In top-down installation, a clip is disposed along the downhill edge of the first panel and affixed to the underlying structure, and a second panel is engaged with the receiving member of the first panel. In bottom-up installation, the first panel is affixed to the underlying structure, and a second panel is engaged with the interlocking member of the first panel, and then affixed to the underlying structure.

Publication US 9,267,289 presents an interlocking panel system for top-down installation on an underlying structure including a plurality of panels, with an uphill course and a downhill course where each panel is generally rectangular, having an uphill edge and opposing downhill edge. An interlocking member is disposed along the uphill edge, and a receiving member adapted to receive the interlocking member and a joining flange are disposed along the downhill edge. A panel of the uphill course is affixed to an underlying structure via fasteners through the joining flange. The interlocking member of a panel of the downhill course is insertable into the receiving member of the uphill course, and the position of the panel of the downhill course is adjustable within the span of the receiving member.

Objective of the invention

The object of the invention is to provide a roofing panel system for top-down installation that is easy to install so that tight fits are formed between the individual panels of the roofing panel system for top-down installation.

Short description of the invention

The roofing panel system for top-down installation of the invention is characterized by the definitions of independent claim 1.

Preferred embodiments of the roofing panel system for top-down installation are defined in the dependent claims. List of figures

In the following the invention will described in more detail by referring to the figures, which

Figure 1 shows a first embodiment an embodiment of the roof panel for use in the roofing panel system,

Figure 2 shows the roof panel shown in figure 1 as seen from another angle,

Figure 3 shows the roof panel shown in figure 1 as seen from another angle,

Figure 4 shows the roof panel shown in figure 1 as seen from another angle,

Figure 5 shows the roof panel shown in figure 1 as seen from the side of the inner surface, Figure 6 shows the roof panel shown in figure 1 as seen from the side of the outer surface, Figure 7 shows the roof panel shown in figure 1 as seen from the side of the first side edge, Figure 8 shows a first embodiment of the roof panel system as seen from above,

Figure 9 shows the roof panel system shown in figure 8 as seen from one side,

Figure 10 shows detail C of figure 8 in greater detail,

Figure 11 shows a second embodiment of the roof panel for use in the roofing panel system, Figure 12 shows the roof panel shown in figure 11 as seen from another angle,

Figure 13 shows the roof panel shown in figure 11 as seen from the side of the inner surface, Figure 14 shows the roof panel shown in figure 11 as seen from the side of the outer surface, Figure 15 shows the roof panel shown in figure 1 as seen from the side of the first side edge,

Figure 16 shows a second embodiment the roof panel system as seen from one side,

Figure 17 shows detail D of figure 21 in greater detail,

Figure 18 shows in section view the first side edge of the roof panel shown in figures 1 to 7 or the first side edge of the roof panel shown in figures 11 to 15,

Figure 19 shows in section view the second side edge of the roof panel shown in figures 1 to 7 or the first side edge of the roof panel shown in figures 11 to 15,

Figure 20 shows two roof panels connected together by a first side edge of one of the roof panels and a second side edge of the other of the roof panels, and

Figure 21 shows in section view a detail of the connection between the two roof panels shown connected together in figure 20.

Detailed description of the invention

Next the roofing panel system for top-down installation and some embodiments and variants of the roofing panel system will be described in greater detail.

The roofing panel system comprises a plurality of panels 1 defining an uphill course of panels 2 and a downhill course of panels 3.

Each panel 1 comprises a generally rectangular panel body 4 with a lower edge 5, an upper edge 6, a first side edge 16, a second side edge 17, an outer surface 7, and an inner surface 8. The lower edge 5 and the upper edge are preferably parallel. The first side edge 16 and the second side edge 17 are preferably parallel. The outer surface 7 and the inner surface are preferably plane parallel, except for possible stiffening formations 28 and/or aesthetic formations provided at or in the generally rectangular panel body 4.

Each panel 1 comprises a male interlocking edge 9 at the upper edge 6 of the generally rectangular panel body 4 extending preferably, but not necessarily, for the full width of the upper edge 6 of the generally rectangular panel body 4 of the panel 1, and a female interlocking edge 10 at the lower edge 5 of the generally rectangular panel body 4 extending preferably, but not necessarily, for the full width of the lower edge 5 of the generally rectangular panel body 4 of the panel 1.

The female interlocking edge 10 of the panels 1 of the uphill course of panels 2 being configured to receive i.e. to interlock with the male interlocking edge 9 of the panels 1 of the downhill course of panels 3. The female interlocking edge 10 of the panels of the uphill course of panels 2 are configured to receive the male interlocking edge 9 of the panels of the downhill course of panels 3 in a locking position where a first transversal abutting section 36 of the female interlocking edge 10 abuts a second transversal abutting section 37 of the male interlocking edge 9 and where the generally rectangular panel body 4 of the panels 1 of the downhill course of panels 3 and the generally rectangular panel body 4 of the panels 1 of the uphill course of panels 2 are essentially parallel. In the locking position, the male interlocking edge 9 of the panels of the downhill course of panels 3 is prevented from moving further into the female interlocking edge 10 of the panels of the uphill course of panels 2, because the first transversal abutting section 36 of the female interlocking edge 10 abuts the second transversal abutting section 37 of the male interlocking edge 9.

The male interlocking edge 9 can have a cross-section in the form of the major arc of a circle. In such case, the second transversal abutting section 37 of the male interlocking edge 9 is formed at a curved outer surface (not marked with a reference numeral) of the male interlocking edge 9.

Alternatively, the male interconnecting edge 9 can have or be formed of a pair of first flanges (not shown in the figures) and a first web portion (not shown in the figures) interconnecting the first flanges. In such case, the first web portion forms the second transversal abutting section 37 of the male interlocking edge 9.

The male interlocking edge 9 extends upwardly in relation to the outer surface 7 of the generally rectangular panel body 4 of the panel 1.

The female interlocking edge 10 can, as in the first embodiment illustrated in figures 1 to 14, have a cross-section in the form of the major arc of a circle. In such case, the first transversal abutting section 36 of the female interlocking edge 10 is formed at a curved inner surface (not marked with a reference numeral) of the female interlocking edge 10.

Alternatively, as in the second embodiment illustrated in figures 15 to 19, the female interlocking edge 10 can have a pair of second flanges 32 and a second web portion 33 interconnecting the second flanges 32. In such case, the second web portion 33 forms the first transversal abutting section 36 of the female interlocking edge 10. The second flanges 32 can be essentially parallel, and the second web portion 33 can extend essentially perpendicularly with respect to the second flanges 32. If the female interlocking edge 10 of the panels 1 has a pair of second flanges 32 and a second web portion 33, the male interlocking edge 9 of the panels 1 of the downhill course of panels 3 is preferably, but not necessarily, as shown in figure 17, configured to press against the second flanges 32 and against the second web portion 33 of the female interlocking edge 10 inside the female interlocking edge 10 of the panels 1 of the uphill course of panels 2. This provides for a rigid and strong connection between the panels 1 of the downhill course of panels 3 and the panels 1 of the uphill course of panels 2.

The female interlocking edge 10 extends downwardly in relation to the inner surface 8 of the generally rectangular panel body 4 of the panel 1.

The female interlocking edge 10 has a protruding edge 31 for snap-effect with the male interlocking edge 9. The protruding edge 31 of the female interlocking edge 10 is configured to releasable lock the male interconnecting edge 9 at least partly inside and as received in the female interconnecting edge 10 to releasable retain the male interlocking edge 9 of the panels 1 of the downhill course of panels 3 received in the female interlocking edge 10 of the panels 1 of the uphill course of panels 2 in said locking position.

The male interlocking edge 9 and the female interlocking edge 10 provides for easy installing of the roofing panel system so that tight fits are formed between the individual panels of the roofing panel system for top-down installation. Additionally, allows for repeated attaching and detaching of panels 1 of the uphill course of panels 2 from panels 1 of the downhill course of panels 3 without damaging the panels 1.

If the male interlocking edge 9 has a cross-section in the form of the major arc of a circle and if female interlocking edge 10 has a cross-section in the form of the major arc of a circle, especially tight fits are formed between the individual panels of the roofing panel system for top- down installation.

Each panel 1 may comprise an offset 11 forming a lower outer surface 12 of the panel 1. The offset 11 extends downwardly, preferably perpendicularly downwardly, from the inner surface 8 of the generally rectangular panel body 4 at the lower edge 5 of the generally rectangular panel body 4. The offset 11 is provided between the generally rectangular panel body 4 and the female interlocking edge 10. The offset 11 extends preferably for the full width of the lower edge 5 of the generally rectangular panel body 4. A purpose of the offset 11 is to provide for strength and/or stiffness. Another purpose is to provide for spatial shape.

If the panels 1 comprise an offset 11 as presented earlier, a first spring portion 13 can be provided between the offset 11 and the female interlocking edge 10. The protruding edge 31 of the female interlocking edge 10 adjoins preferably, but not necessarily, such first spring portion 13. The first spring portion 13 extends preferably in the same direction as the generally rectangular panel body 4. The first spring portion 13 can be plane parallel with the generally rectangular panel body 4. The first spring portion 13 extends preferably for the full width of the lower edge 5 of the generally rectangular panel body 4 and/or for the full width of the female interlocking edge 10. If the panels 1 comprise an offset 11 as presented earlier, a second spring portion 14 can be onnected to the female interlocking edge 10 and extend in the direction of the generally rectangular panel body 4 away from the upper edge 6 of the generally rectangular panel body 4 beyond the lower edge 5 of the generally rectangular panel body 4 so that the second spring portion 14 has a first distal free end edge 29. The second spring portion 14 extends preferably for the full width of the lower edge 5 of the generally rectangular panel body 4 and/or for the full width of the female interlocking edge 10. The second spring portion 14 can be plane parallel with the generally rectangular panel body 4. A third spring portion 15 can be connected to the male interlocking edge 9 and extending in the direction of the generally rectangular panel body 4 towards the lower edge 5 of the generally rectangular panel body 4 so that the third spring portion 15 has a second distal free end edge 30. The third spring portion 15 can be plane parallel with the generally rectangular panel body 4. The third spring portion 15 extends preferably for the full width of the upper edge 6 of the generally rectangular panel body 4 and/or for the full width of the male interlocking edge 9. If the panels 1 of the roofing panel system comprise a first spring portion 13, a second spring portion 14, and a third spring portion 15 as presented earlier, the first spring portion 13 of the panels 1 of the uphill course of panels 2 are preferably, but not necessarily, configured to press against the third spring portion 15 of the panels 1 of the downhill course of panels 3. This provides for a tight and rigid connection between the panels 1 in the uphill course of panels 2 and the panels 1 in the downhill course of panels 3.

If the panels 1 of the roofing panel system comprise a first spring portion 13, a second spring portion 14, and a third spring portion 15 as presented earlier, the second spring portion 14 of the panels 1 of the uphill course of panels 2 are preferably, but not necessarily, configured to press against the inner surface 8 of the generally rectangular panel body 4 of the panels 1 of the downhill course of panels 3. This provides for a tight and rigid connection between the panels 1 in the uphill course of panels 2 and the panels 1 in the downhill course of panels 3.

The third spring portion 15 of the panels 1 of the downhill course of panels 3 is preferably, but not necessarily, as illustrated in figures 10 and 17, located at least partly outside the female interconnecting edge 10 of the panels 1 of the uphill course of panels 2 so that the third spring portion 15 of the panels 1 of downhill course of panels 3 extend beyond the protruding edge 31 of the female interconnecting edge 10 of the panels 1 of the uphill course of panels 2 and so that second distal free end edge 30 of the third spring portion 15 of the downhill course of panels 3 is located outside the female interconnecting edge 10 of the uphill course of panels 2. This allows for easy opening of the connection between the panels 1 of the downhill course of panels 3 and the panels 1 of the uphill course of panels 2, which can for example be of an advantage when the roofing panel system is installed on a roof.

If the panels 1 of the roofing panel system comprise a first spring portion 13, a second spring portion 14, and a third spring portion 15 as presented earlier, the second spring portion 14 is preferably, but not necessarily, in the direction of the lower edge 5 of the generally rectangular panel body 4 divided into spring sections 18 distanced from each other by an intermediate space 19 between two adjacent spring sections 18, and the first side edges 16 of the panels 1 and the second side edges 17 adjacent panels 1 of the downhill course of panels 3 penetrate into the intermediate spaces 19 between two adjacent spring sections 18 of the panels 1 of the uphill course of panels 2. The intermediate space 19 allows for a better connection i.e. longer connection between the first side edges 16 of the panels 1 and the second side edges 17 adjacent panels 1 of the downhill course of panels 3.

The spring sections 18 of the second spring portion 14 are preferably, but no necessarily, connected with a flat fastening strip 20 extending in the direction of the lower edge 5 of the generally rectangular panel body 4, wherein the flat fastening strip 20 and the generally rectangular panel body 4 are essentially plane parallel.

If the panels 1 of the roofing panel system comprise a first spring portion 13, a second spring portion 14, and a third spring portion 15 as presented earlier, the second spring portion 14 is preferably, but not necessarily, provided with openings 27 configured to receive fasteners such as screws. By means of fasteners, the roofing panels system is attached to an underlying structure. Because the openings 27 are provided in the second spring portion 14, the openings 27 and the fasteners received in the openings 27 will be covered by the panels 1 in a downhill course of panels 3 in the roofing panel system. The openings 27 are preferably, but not necessarily, provided in a fastening section 34 of the second spring portion 14, which fastening section 34 of the second spring portion 14 is provided at a greater distance from a plane in which the inner surface 8 of the generally rectangular panel body 4 lies in than a part of the second spring portion 14 that is between the female interlocking edge 10 and the fastening section 34 of the second spring portion 14. The fastening section 34 of the second spring portion 14 extends preferably, but not necessarily, in the direction of the generally rectangular panel body 4. Provision of such fastening section 34 results in the roofing panel system in a for receiving a head of a fastener between the panels 1 in a downhill course of panels 3 and the panels 1 in an uphill course of panels 2, such as in room 35 for receiving a head of a fastener between the inner surface 8 of the panels 1 in a downhill course of panels 3 and the second spring portion 14 of the panels 1 in an uphill course of panels.

In the roofing panel system, the outer diameter of the male interlocking edge 9 corresponds preferably, but not necessarily, as shown in figures 14 and 15, essentially to the inner diameter of the female interlocking edge 10 so that the female interlocking edge 10 of the panels 1 of the uphill course of panels 2 being configured to press against the male interlocking edge 9 of the panels 1 of the downhill course of panels 3. This provides for a tight fit between the male interlocking edge 9 and the female interlocking edge 10. In the roofing panel system, each panel 1 can have a folded-over side edge 21 at a first side edge 16 of the generally rectangular panel body 4 and a folded-under side edge 22 at a second side edge 17 of the generally rectangular panel body 4. Each folded-under side edge 22 has a first flat flap portion 23, which is essentially plane parallel with the generally rectangular panel body 4. Each folded-over side edge 21 has a second flat flap portion 24, which is essentially plane parallel with the generally rectangular panel body 4, and an intermediate flat portion 25 between the first side edge 16 of the generally rectangular panel body 4 and the second flat flap portion 24. The intermediate flat portion 25 and the second flat flap portion 24 of each folded-over side edge 21 are essentially parallel. Adjacent panels 1 in the uphill course of panels 2 and correspondingly in the downhill course of panels 3 are configured to receive the second flat flap portion 24 of a folded- over side edge 21 of an adjacent panel 1 between the first flat flap portion 23 of a folded- under side edge 22 and the generally rectangular panel body 4 and configured to receive the first flat flap portion 23 of a folded-under side edge 22 of an adjacent panel 1 between the second flat flap portion 24 and the intermediate flat portion 25 of a folded-over side edge 21. The width of the intermediate flat portion 25 of the folded-over side edge 21 corresponds preferably, but not necessarily, to the width of the first flat flap portion 23 of the folded-under side edge 22. Providing each panel 1 with such folded-over side edge 21 and such folded- under side edge 22 provides for a tight and strong connection between each panel 1 in the uphill course of panels 2 and for a tight and strong connection between each panel 1 in the downhill course of panels 3. The distance between the intermediate flat portion 25 and the second flat flap portion 24 of the folded-over side edge 21 corresponds preferably, but not necessarily to the distance between the generally rectangular panel body 4 and the first flat flap portion 23 of the folded under side edge 22 so as to allow sliding of the folded-over side edge 21 of one panel 1 into the folded-under side edge 21 of an adjacent panel 1.

The folded-over side edge 21 can extend from the first side edge 16 of the generally rectangular panel body 4 essentially in the direction of the generally rectangular panel body 4.

The folded-over side edge 21 can extend beyond the first side edge 16 and in a plane parallel with the generally rectangular panel body 4 away from the first side edge 16 of the generally rectangular panel body 4 and away from the second side edge 17 of the generally rectangular panel body 4.

The folded-over side edge 21 can extend in a plane parallel with the generally rectangular panel body 4.

The folded- under side edge 22 can extend from a second side edge 17 of the generally rectangular panel body 4 essentially in the direction of the generally rectangular panel body 4.

The folded- under side edge 22 can extend from a second side edge 17 of the generally rectangular panel body 4 in a plane parallel with the generally rectangular panel body 4 towards the first side edge 16 of the generally rectangular panel body 4.

In the roofing panel system, the outer surface 7 of the generally rectangular panel body 4 of each panel 1 is preferably, but not necessarily, flat and the outer surface 7 of the generally rectangular panel body 4 of each panel lies in a first plane A. In each panel 1, the folded-over side edge 21 has preferably, but not necessarily, a flat upper surface 26 that lies in a second plane B, that is parallel with the first plane A. The distance between the first plane A and the second plane B corresponds to a thickness X of the generally rectangular panel body 4. This provides for a generally uniform flat upper surface in each uphill course of panels 2 and in each downhill course of panels 3.

The width of the intermediate flat portion 25 of the folded-over side edge 21 corresponds preferably, but not necessarily, to the width of the first flat flap portion 23 of the folded- under side edge 22.

The folded-over side edge 21 extends preferably, but not necessarily, for the full width of the first side edge 16 of the generally rectangular panel body 4. An advantage of this is a tighter connection between adjacent panels 1.

The folded-under side edge 22 extends preferably, but not necessarily, for the full width of the second side edge 17 of the generally rectangular panel body 4. An advantage of this is a tighter connection between adjacent panels 1.

In the roofing panel system, each panel 1 is preferably, but not necessarily, a monolithic structure formed of a single metal sheet of uniform thickness. The panel 1 can be coated such as painted or covered with a protective layer

It is apparent to a person skilled in the art that as technology advanced, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.