AU2016228262C1 - A multi-part roof flashing assembly - Google Patents

Abstract

A flashing assembly for flashing about a roof penetration, the assembly comprising: a pair of side trays adapted for placement to each side of a roof penetration, an upper tray adapted for placement behind the roof penetration, the upper tray having a main body portion adapted to overlie the roof, and a front upstanding panel, a front apron adapted for placement in front of the roof penetration, the front apron having a main body portion adapted to overlie the roof, and a rear upstanding panel, and, a pair of side aprons adapted for placement on the side trays, each side aprons comprising a main body portion and an upstanding side panel. 1/7 39 40 38 42 4 42 4 41 41 FIG 1 ROOF OPENING 40 10 19 38 54 35 3 32 21 12 35 / 49 1 32 29 / 13 52 52 27 FIG 2 FLASHING ASEMBLY

Description

1/7

39

40

384242 4 4

41

41 FIG 1 ROOF OPENING

40

10 19 38 54

35 3 32 21

12 35 / 49 1 32 29

/ 13 52 52

27

FIG 2 FLASHING ASEMBLY

A MULTI-PART ROOF FLASHING ASSEMBLY

[1] TECHNICAL FIELD

[2] The present invention is directed to a flashing assembly to weatherproof about roof penetrations. Such flashings are also known as "penetration flashings".

[3] BACKGROUND

[4] Any references to methods, apparatus or documents of the prior art are not to be taken as constituting any evidence or admission that they formed, or form part of the common general knowledge.

[5] A roof often contains various objects passing through the roof. Such objects are collectively known as "penetrations" or "roof penetrations" as they pass through openings cut or otherwise formed in the roof sheets. The objects can include vent pipes, various types of ducting including air-conditioning ducting, light domes, skylights, roof ventilators (whirlybirds) and the like. The opening in the roof is also often known as a penetration.

[6] To prevent water from passing into the opening cut into the roof, the penetrations are waterproofed by a weather resistant barrier (WRB). These barriers are often known as "flashing".

[7] Flashing refers to thin pieces of impervious material installed to prevent the passage of water into a structure from a joint or as part of a weather resistant barrier (WRB) system. Metal flashing materials include lead, aluminium, copper, stainless steel, zinc alloy, other architectural metals or a metal with a coating such as galvanized steel, lead-coated copper, anodized aluminum, galvalume (aluminum-zinc alloy coated sheet steel), and the like.

[8] For most penetrations, the flashing is purpose made for the particular penetration. This is laborious and expensive. The flashing is usually only suited for one type of roof only and different designs are required for different types of roof profiles such as corrugated iron, concealed fix roofing, flat roofing, pitched roofing and the like.

[9] There would be an advantage if it were possible to provide a flashing assembly which could flash more than one type of penetration thereby doing away with the need to purpose built penetration flashings for each type of roof penetration.

[10] SUMMARY OF THE INVENTION

[11] According to a first aspect of the present invention there is provided a flashing assembly comprising: a pair of side trays adaptable for placement to each side of a roof penetration by cutting recesses into longitudinal edges for enabling the side trays to fit about side edges and part of the upper and lower edge of the penetration, an upper tray adapted for placement behind the roof penetration, the upper tray having a main body portion adapted to overlie the roof, and a front upstanding panel, a front apron adapted for placement in front of the roof penetration, the front apron having a main body portion adapted to overlie the roof, and a rear upstanding panel; and, a pair of side aprons adapted for placement on the side trays, each side aprons comprising a main body portion and an upstanding side panel

[12] This 6 part flashing assembly provides great versatility in being able to flash (weatherproof) various different types of penetrations, and on various different type of roof profiles.

[13] In another form, the invention comprises a flashing assembly to flash about a roof penetration, the flashing assembly including at least one component which comprises an upper tray adapted for placement behind the roof penetration, the upper tray having a main body portion adapted to overlie the roof, and a front upstanding panel.

[14] In another form the invention resides in a method for flashing about a roof penetration, the method comprising fitting the side trays to each side edge of the penetration, fitting the upper tray to adjacent an upper edge of the penetration, fitting the front apron adjacent a lower edge of the penetration, fitting the side aprons on top of the front apron and fastening the components together.

[15] The side trays that form part of the flashing assembly may be identical or substantially identical such that the side trays can be interchangeable. Each side tray may comprise a substantially planar main body portion which may be substantially rectangular when viewed in plan. To provide stiffness to the side tray, it is preferred that stiffening members or elements are provided. Suitably, the stiffening members or elements comprise depending side walls extending from each longitudinal edge of the main body portion. These may be formed integrally with the main body portion and it is envisaged that the sidewalls are formed by a bend line or fold line. To provide further stiffness to the side tray the, or each, side wall may comprise a turned portion which is preferably a turned in lip.

[16] The length of each side tray may vary, but for the purposes of the flashing assembly, and to provide versatility to the flashing assembly, it is envisaged that the length of each side tray will be between 50-150 cm.

[17] Suitably, the side tray is made of relatively thin metal as is usual for flashings and this enables the side tray to be cut to length should this be required.

[18] The width of each side tray may vary and it is envisaged that the width will be between 20-80 cm such that the side tray can overlap at least one and preferably more than one roof profiles such as roof ribs. Suitably, the width of each side tray is such that it can cover two or three roof ribs or similar.

[19] If the side tray comprises a depending side wall, it is preferred that the side wall extends entirely along the length of the main body portion. The height of the side wall may vary but it is considered that a suitable height will be between 5-50 mm. This can enable the side wall to be press fitted to the profile of a "concealed fix" roof panel, and this will be described in greater detail below. For other roof profiles, the side wall may be flattened.

[20] In use, the side tray is adapted to be cut possibly to length but also cut to at least partially fit about the roof penetration and this will be described in greater detail below.

[21] The side trays are also sometimes known as side gullies.

[22] The upper tray is adapted for placement behind the roof penetration. Put differently, the upper tray is adapted to be placed "upstream" on the roof. The upper tray comprises a main body portion and a front upstanding panel. The length of the main body portion can vary but should be at least somewhat longer than the width of the penetration through the roof. Therefore, it is envisaged that the length of the main body portion will be between 1200-1600 mm. This can of course vary to suit.

[23] The main body portion will suitably be substantially rectangular when viewed in plan and will typically have a length as described above, and a width which may be between 50-150 cm.

[24] The front upstanding panel suitably extends entirely along the length of the front longitudinal edge of the main body portion and it is preferred that the front upstanding panel is formed integrally with the main body portion typically by bending about a fold line. The front upstanding panel is suitably angled relative to the main body portion such that the front upstanding panel is substantially vertically orientated as the roof penetration is typically vertically orientated. The height of the front upstanding panel will typically be between -400 mm and preferably between 50-150 mm. The front panel is suitably adapted to be cut to size and this will be described in greater detail below.

[25] The rear edge of the main body portion may contain a turned lip. The turned lip is suitably a turned in lip extending inwardly and above the main body portion. The turned in lip suitably extends entirely along the length of the rear edge of the main body portion and suitably has a width of between 10 100 mm. A function of the turned in lip can be to provide strength and rigidity to the upper tray. Another function of the turned in lip can be to prevent debris and water from being pushed past the upper tray.

[26] Suitably, the main body portion comprises at least one raised portion adapted to assist in fixing a roof sheet to the upper tray. The at least one raised portion may comprise a raised rib. The rib may extend entirely along the length of the main body portion. The rib may have a height of between 5 mm and a width of between 5-40 mm. The rib may divide the main body portion into a lower primary tray and an upper "emergency" or overflow tray. The rib may also function to assist in retaining water in the primary tray and to form a barrier against ready movement of water into the upper tray.

[27] The flashing assembly further comprises a front apron which, in use, is positioned in front or "downstream" from the roof penetration. The front apron can also be called a lower tray. The front apron comprises a main body portion. The main body portion is suitably substantially rectangular when viewed in plan and may have a length similar to that of the length of the upper tray and therefore may have a length of between 1-2 m. It is preferred that the length of the front apron is approximately the same as the length of the upper tray. The front apron comprises a rear upstanding panel. It is preferred that the panel extends substantially entirely along the rear edge of the main body portion and it is further preferred that the panel is formed integrally with the main body portion typically about a fold line.

[28] The front edge of the front apron may be provided with a depending side wall or lip. The side wall suitably extends entirely along the length of the front apron. The side wall is preferably formed integrally with the main body portion typically about a fold line. The width of the side wall will suitably be between 20-100 mm and typically approximately 50 mm. A function of the side wall is to prevent wind driven water or debris from passing underneath the front apron.

[29] The assembly further comprises a pair of adjustable side aprons. The side aprons are preferably identical or substantially identical and can be used interchangeably. Each side apron may comprise a substantially rectangular main body portion and an upstanding side panel. The side panel typically extends substantially along a longitudinal edge of the main body portion and is preferably formed integrally with the main body portion typically along a fold line. The side panel is suitably substantially the same width of the main body portion such that each side apron is substantially L-shaped in configuration. A small turned lip may be provided adjacent the other longitudinal edge of the main body portion, inter alia, to provide stiffness and rigidity to the side apron.

[30] BRIEF DESCRIPTION OF THE DRAWINGS

[31] Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of the Invention in any way. The Detailed Description will make reference to a number of drawings as follows:

[32] Figure 1. Illustrates a roof provided with a cutout (penetration).

[33] Figure 2. Illustrates all the parts of the flashing assembly.

[34] Figure 3. Illustrates one part of the flashing assembly comprising the side tray.

[35] Figure 4. Illustrates a pair of side trays in position and cut to accommodate the particular penetration.

[36] Figure 5. Illustrates another part of the flashing assembly comprising the upper tray.

[37] Figure 6. Illustrates the upper tray of figure 5 cut to shape.

[38] Figure 7. Illustrates another part of the flashing assembly comprising the front apron.

[39] Figure 8. Illustrates the uncut front apron in general position.

[40] Figure 9. Illustrates the front apron cut to shape.

[41] Figure 10. Illustrates another part of the flashing assembly comprising the side apron.

[42] Figure 11. Illustrates the side apron cut to shape.

[43] Figure 12. Illustrates an upper sheet connected over a rear part of the upper tray to form part of a dry pan arrangement.

[44] Figure 13. Illustrates in greater detail a support bracket on which the upper sheet can be fastened.

[45] Figure 14. Illustrates a PRIOR ART drypan to the roof apex.

[46] DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[47] The embodiment will describe use of the assembly for a rectangular or square cut out (penetration) in the roof, typically for an air conditioning duct. However, this is an example only of one use for the assembly and the assembly is able to be used for other penetrations.

[48] Referring initially to figure 1, there is illustrated one type of roof profile (in this case a concealed fix roof profile) containing a rectangular cut-out (penetration) through which an item can pass. The item is not illustrated but will typically be an air conditioning duct. Also, the illustrated roof profile (a concealed fix profile) is not limiting to the invention and an advantage of the present invention is that it can be used on virtually any type of metal roof including a corrugated iron roof, a channel type roof and the like.

[49] In order to prevent water from flowing into the cut-out, a flashing assembly 10 is provided. The flashing assembly in the embodiment of the invention comprises six pieces 12, 13, 19, 27, 32, and 33 of which the upper tray is the most significant.

[50] The pieces of the flashing assembly comprise metal sheets as is normal with flashing the sheets able to be cut and trimmed to size and shape using tin snips or something similar.

[51] Figure 2 illustrates all the parts of the flashing assembly together to weatherproof the opening in the roof.

[52] Attachment of the various pieces of the flashing assembly can be achieved in various different orders, but a preferred method is to initially fit the side trays 12, 13, followed by the upper tray 19, followed by apron 27 (although fitment of tray 19 and apron 27 can be in reverse order), followed by fitment of the side aprons 32, 33.

[53] The side trays 12, 13 are best illustrated in figures 3-4. The side trays 12, 13 are identical. Each side tray comprises a planar main body portion 14 having longitudinal edges which form a fold line to fold down smaller sidewalls , 16 which terminate in small turned in lips 17. These small turned in lips 17 are useful if the roof profile is a concealed fix profile as illustrated in figure 1 as the lips can engage against the rib profile 41. In practice, the width of each side tray is such that it extends over two pans 42 (see figure 1) of the roof profile and clips against the respective ribs.

[54] However, the assembly according to the present invention is not limited to concealed fix roof profiles and can also be fitted to other roof profiles for instance corrugated profiles. In this arrangement, the small turned in lips 17 can be flattened against the sidewalls 15.

[55] Each side tray 12, 13 can be cut in the manner illustrated in figure 4 to pass about each opposed side edge 43, 44 of penetration 40 and slightly about the upper and lower edge 45, 46 of penetration 40.

[56] The upper (upstream) part of the penetration 40 is further protected by the upper tray 19 which is best illustrated at least in figures 5-6. The length of the upper tray 19 is typically sufficient to extend across at least two widths of roofing sheets and as a roofing sheet typically has a width of 700 mm, the length of tray 19 is typically about 1.4 m. This can of course vary to suit.

[57] Tray 19 comprises a main body portion 20 having a width of about 1 m. Specifically, the main body portion is divided into a lower primary drainage tray 24 having a width of about 590 mm, and an upper overflow tray 25 having a width of about 300 mm the two trays being divided by a rib (or dam) 23 having a width of about 30 mm and a height of about 30 mm.

[58] The front edge of main body portion 20 comprises an integrally formed bent up panel 21 extending along the entire front edge. Panel 21 is angled at about 950 relative to the main body portion. This angle will of course vary depending on the roof pitch as the angle of panel 21 when fitted to the roof should be substantially vertical and this will determine the angle of panel 21 relative to the main body portion of the upper tray 19. Panel 21 has a height of approximately 150 mm due to cut size.

[59] Rib 23 extends along the length of the main body portion. A function of rib 23 is to support upper sheets 50 of roofing material that form part of a dry pan arrangement, the upper sheets 50 being illustrated in figure 12. If the upper sheets 50 comprise corrugated iron (as is the case in figure 12), the sheets 50 can be screwed or otherwise fastened into the top horizontal wall 23A of rib 23. Alternatively, if the upper sheet 50 comprise concealed fix roofing sheet profiles, the horizontal wall 23A can contain roof clips (not illustrated) to enable the roofing sheets to be clipped to the roof clips.

[60] Upper tray 19 includes a rear turned lip 22 having a width of about 50 mm and being angled at about 450 relative to the main body portion and extending entirely along the length of the rear edge of the main body portion. Lip 22 functions as a containment wall for any water or debris that may overflow into the upper tray 25. Lip 22 (best illustrated in figure 12) is also sized to press up against the underside of upper sheet 50 to minimise any water or debris passing between lip 22 and the underside of sheet 50.

[61] Upper tray 19 is initially in the uncut configuration as illustrated in figure 5 and can be trimmed to shape by trimming the front panel 21 to suit the particular penetration 40. Figure 6 illustrates a typical configuration of the trimmed tray 19 and particularly the trimmed front panel 21.

[62] Figure 7-8 illustrate the front apron 27. Front apron 27 comprises a main body portion 28, a turned up rear panel 29 extending along a rear edge of the main body portion and a smaller depending front side wall or lip 30. The function of lip 30 is to assist in preventing windblown debris or other unwanted matter from passing along the roof and underneath the front part of the flashing assembly.

[63] The apron 27 is cut to a particular shape but for ease of understanding of the embodiment of the present invention, reference will be had to figure 8, which illustrates the uncut apron 27 in position and extending over the front portions of side trays 12, 13.

[64] Figure 9 illustrates a front apron 27 cut to shape. The rear panel 29 has been cut to include a pair of tabs 48, 49 which are bent rearwardly about respective fold lines. The tabs 48, 49 are just visible in figure 2, and function to enable the side aprons 32, 33 to be riveted or otherwise attached to the front apron 27 via the tabs. The main body portion 28 of the front apron 27 has also been trimmed to properly fit over the top of the side trays 12, 13.

[65] Figures 10-11 illustrates the side aprons 32, 33. The side aprons 32, 33 are identical. Each side apron comprises a main body portion 34 one longitudinal edge of which contains a bent up side panel 35 and the other longitudinal edge of which contains a turned under lip 36 to provide strength and rigidity to the side apron. Figure 10 illustrates the side apron uncut and figure 11 illustrates the same side apron having been cut and bent to shape. Specifically, the upwardly extending side panel 35 has one end cut along cut line 37 (see figure 11) and the cut away parts of the side panel is bent inwardly to form a fastening tab 38. The tabs 38 are also illustrated in figure 2 and it can be seen that the tabs allow the upstanding panel 21 of upper tray 19 to be fastened to the tabs typically by rivets.

[66] The other end of each side apron 32, 33 has the respective side panel cut entirely away at 51 to provide a short elongate tongue portion 52 which can enable the side apron to be fastened to the front apron via fasteners (typically rivets) passing through the tongue portion 52 and into the main body portion of front apron 27 this being illustrated at least in figure 2.

[67] Thus, and again referring to figure 2, the upstanding parts of the flashing assembly extending about the roof penetration 40 (these parts sometimes called the apron or collar) comprises the upstanding panel 21 of upper tray 19, the upstanding panel 29 of front apron 27, and the two upstanding panels 35 on each of the side aprons 32, 33.

[68] Each side apron 32, 33 is simply placed on top of the side trays 12, 13 and have a measure of adjustability in that it can be attached to the side tray 12, 13 at any position depending on the size of the penetration. When in the correct position, the side aprons can be fastened to the side trays 12, 13 by fasteners passing through the main body portion 34 of each side apron and into the main body portion 14 of each side tray. The tab 38 on each side apron is also fastened to the upstanding panel 21 of the upper tray. The lower tongue portion 52 on each side apron is fastened to the main body portion 28 of the front apron 27.

[69] Referring to figure 11, when the tab portion 38 is bent inwardly, this leaves behind a forward tongue portion 53 and this can be positioned underneath the main body portion 14 of the upper tray 19. This tongue portion is not illustrated in figure 2 as the tongue portion is below the main body portion but will generally be in the position illustrated by reference numeral 54 in figure 2

[70] The upper end of each side tray 12, 13 is riveted or screwed to the main body portion 20 of upper tray 19.

[71] Sealant can be used to seal any small gaps between the various flashing parts.

[72] The flashing assembly can be used as a dry pan. A particularly weather resistant type of dry pan is one where the dry pan extends all the way from the penetration to the roof apex. Figure 14 illustrates such an arrangement where the dry pan 55 extends all the way to a roof apex 56.

[73] Referring now to figures 12 and 13 there is illustrated a bracket 57 to allow upper roof sheets 50 to be screwed to the bracket 57. These upper roof sheets 50 extend all the way to the apex of the roof and therefore function to replace the various dry pan panels 55A-D etc. illustrated in figure 14 and which are tedious and time-consuming to fit. In this particular embodiment of the invention, instead of multiple fitment of dry pan panels, it is only necessary to use roof sheets 50 which are cut to length such that the roof sheets extend to the roof apex and sufficient roof sheets are used for the width of the roof penetration. In most cases, two roof sheets of about 700 mm wide (a total of about 1.4 m) will be sufficient.

[74] Referring again to figure 12, 13, in the embodiments of the present invention, roof sheets 50 can be securely fitted by screwing (or otherwise fastening) the upper sheets to the bracket 57 in the manner illustrated in figure 12. If the upper sheets comprise concealed fix sheets, the bracket can contain clips (not illustrated) which connect to the roof sheets.

[75] Bracket 57 comprises an elongate steel member and has a particular configuration which comprises a longitudinal flange 58 which is adapted to sit on top of the existing roof sheets 59 (see figure 12) and an inverted channel shaped portion 60 which is adapted to be positioned over the existing line of screws 61 in roof 59. The reason for this particular configuration is to ensure that bracket 57 can be securely screwed to the roof purlin on which the existing roof sheets 59 are fixed. Thus, by placing the elongate bracket in such a manner that the existing roof screws 61 locate within the channel shaped portion 60, this ensures that any fastener 62 drilled through flange 58 will also pass into the purlin making sure that bracket 57 is properly secured to the existing roof purlins. This particular bracket configuration does away with much of the guesswork in making sure that the upper roof sheets are properly secured in place.

[76] The above description identifies at least one specific, substantial and credible use for the invention as a flashing assembly to enable roof penetration to be made weatherproof.

[77] In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. The term "comprises" and its variations, such as "comprising" and "comprised of' is used throughout in an inclusive sense and not to the exclusion of any additional features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims appropriately interpreted by those skilled in the art.

[78] Throughout the specification and claims (if present), unless the context requires otherwise, the term "substantially" or "about" will be understood to not be limited to the value for the range qualified by the terms.

[79] Any embodiment of the invention is meant to be illustrative only and is not meant to be limiting to the invention. Therefore, it should be appreciated that various other changes and modifications can be made to any embodiment described without departing from the spirit and scope of the invention.

Claims (14)

The claims defining the invention are as follows:

1. A flashing assembly for flashing about a roof penetration, the assembly comprising: a pair of side trays adaptable for placement to each side of a roof penetration by cutting recesses into longitudinal edges for enabling the side trays to fit about side edges and part of the upper and lower edge of the penetration, an upper tray adapted for placement behind the roof penetration, the upper tray having a main body portion adapted to overlie the roof, and a front upstanding panel, a front apron adapted for placement in front of the roof penetration, the front apron having a main body portion adapted to overlie the roof, and a rear upstanding panel, and, a pair of side aprons adapted for placement on the side trays, each side aprons comprising a main body portion and an upstanding side panel.

2. The assembly as claimed in claim 1, wherein the main body portion comprises a lower primary drainage tray, an upper drainage tray, a rib extending along the main body portion to separate the primary drainage tray from the upper drainage tray, the rib adapted to assist in securing upper roof sheets to the upper tray, and a turned up lip on a rear edge of the main body.

3. The assembly as claimed in claim 1 or claim 2, wherein the side trays are identical, each side tray comprising a main body portion having longitudinal edges, each longitudinal edge including a depending side wall.

4. The assembly as claimed in any one of the preceding claims wherein the front apron comprises a main body portion having longitudinal edges, an upstanding rear panel extending from one said longitudinal edge and a depending front lip extending from the other said longitudinal edge.

5. The assembly as claimed in any one of the preceding claims, wherein the side aprons are identical and comprise a main body portion having longitudinal edges and a side panel extending upwardly from one longitudinal edge.

6. The assembly as claimed in any one of the preceding claims including a support bracket adapted to be fitted to the roof containing the penetration, upper sheets adapted for attachment to the support bracket.

7. The assembly as claimed in claim 6, wherein the support bracket is elongate and comprises an inverted channel section and a flange extending from one side of the channel section, the flange adapted to accommodate a fastener to enable the bracket to be fastened to support members to which the roof is fixed.

8. A method for flashing about a roof penetration using the flashing assembly as claimed in any one of the preceding claims, the method comprising fitting the side trays to each side edge of the penetration, fitting the upper tray to adjacent an upper edge of the penetration, fitting the front apron adjacent a lower edge of the penetration, fitting the side aprons on top of the front apron and fastening the components together.

9. The method as claimed in claim 8, wherein recesses are cut into longitudinal edges of the side trays to enable the side trays to fit about the side edges and part of the upper and lower edge of the penetration.

10. The method as claimed in claim 8 or claim 9 wherein the upper tray comprises an upstanding panel, the panel being cut to substantially extend along the upper edge of the penetration.

11. The method as claimed in any one of claims 8-10, wherein the front apron comprises an upstanding rear panel, the rear panel being cut to form tab portions, the tab portions adapted to enable the side aprons to be fastened to the front apron.

12. The method as claimed in any one of claims 8-11, wherein the side aprons contain an upstanding side panel, the side panel being cut to form a tab portion, the tab portion adapted to enable the side apron to be fastened to the upper tray.

13. The method as claimed in any one of claims 8-12, including an elongate bracket attached to the roof containing the penetration and behind the upper tray, the elongate bracket comprising an inverted channel portion and an extending flange, the flange adapted to accommodate fasteners to enable the flange to be screwed into the supporting members to support the roof, the inverted channel portion being placed over the existing screws in the roof, and at least one upper sheet being attached to the support bracket.

14. The flashing assembly as claimed in any one of claims 1 to 7 wherein the main body portion comprises a lower primary drainage tray, an upper drainage tray, a rib extending along the main body portion to separate the primary drainage tray from the upper drainage tray, the rib adapted to assist in securing upper roof sheets to the upper tray, and a turned up lip on a rear edge of the main body portion the lip adapted to engage, or be in close proximity to the underside of upper roof sheets attached to the rib.