GB2441054A

GB2441054A - Roofing component

Info

Publication number: GB2441054A
Application number: GB0716048A
Authority: GB
Inventors: David Ryan Cole
Original assignee: FILON PRODUCTS Ltd
Current assignee: FILON PRODUCTS Ltd
Priority date: 2006-08-19
Filing date: 2007-08-17
Publication date: 2008-02-20
Also published as: GB0616540D0; GB0716048D0

Abstract

A roofing component 1 having a first web 3 disposable parallel to a marginal edge portion of a roof, said first web 3 being provided with bonding formations 7 on an upper surface of the first web 3 to provide a mechanical interlocking bond with a settable liquid applied coating, and a second web 5 extending at an angle with respect to the first web 3. The bonding formations 7 may be formed integrally with the first web or may be provided on one surface of an extruded bonding strip, the opposed surface being fixed to the first web 3. In one embodiment the bonding formations are in the form of a series of spaced apart undercut channel formations, wherein each channel has a wedge shaped cross sectional form for mechanically interlocking with a set liquid applied coating. The roofing component may be in the form of a drip edge trim, the second vertical web having a returned free edge 9 receiving a connecting strip 11 for connecting extruded trims in overlapping edge to edge relationship and which accommodates thermal movement.

Description

Roofing Components This invention relates to roofing components

particularly for roofs incorporating liquid applied coatings bonded to roof sub structures such as glass reinforced polyester ( referred to herein as GRP') bonded roofs.

GRP trims are conventionally used to seal the junction of flat roofs with an adjacent structure or at the roof edge. Existing GRP trim systems have to be sufficiently prepared to ensure adequate bonding. A rough yet clean surface is required prior to the application of base o coat resin and top coat resin being applied to obtain a permanent bond Adequate surface preparation is an important factor as otherwise the base and finish coat required to provide UV protection and aesthetic finish will not fully adhere to the substrate or to each other.

Further, the top coat resin finish applied to GRP trims can give a very non-uniform finish I 5 depending on the weather conditions at the time of application. Finish may also be affected by the curing time of the resin /catalyst mixture. Likewise the skill of the operative in not only mixing the catalyst but also the application of the same to the GRP substructure can have major piffalls.

Despite numerous potential advantages the use of pvcU trims and other roofing components in the construction of liquid applied GRP roofing systems has hitherto been precluded by the difficulty of bonding materials of fundamentally different types to provide a durable roofing structure arid for many years GRP roofing systems of necessity have incorporated roofing components such as trims and roof corner pieces which have been pre-fabricated from GRP materials despite longstanding and well known disadvantages.

The present invention also mitigates other problems that have long been experienced in connection with the bonding of trims and the like hitherto fabricated from GRP materials.

Likewise the time saving on the application of these further required coatings is very significant since the invention provides roofing components such as trims and corner pieces which require no surface finishing.

The invention consists in a roofing component having a first web disposable parallel to an edge portion of a roof, said first web being provided with bonding formations on an upper surface of the first web to provide a mechanical interlocking bond with a settable liquid applied coating and a second web extending at an angle with respect to the first web The bonding formations more particularly described herein may generally be of such form as will mechanically retain a liquid applied coating to ensure that bonded roofing components remain secure under foreseeable environmental conditions prevailing in roofing and similar applications it will be appreciated that various forms of bonding formation may be employed s to provide mechanical interlocking with a set liquid material so as to resist separation during the normal service life of the roof or other structure.

Where circumstances permit it is preferred that the bonding formations are formed integrally by extrusion. In the case of extruded roofing components the bonding formations may be formed during the extrusion process. Bonding strips having bonding formations provided on one surface may also formed by extrusion the opposed face being fixed by adhesion or solvent welding to injection molded pvcU roofing components for example, or otherwise where bonding formations cannot be formed integrally during the manufacture of a roofing component. Generally, in the case of pvcU and other plastics compositions very strong adhesive or solvent welded bonds may be formed between a molded roofing component and a separate extruded article having integral bonding formations.

In this specification the tern, liquid applied coating' and similar expressions includes thermosettirig GRP resins and other known setting liquid compositions applied in liquid form as a coating for producing a protective layer for a roof or other structure and for bonding with associated roofing components such as roof edge trims and corner pieces of various kinds as will be more particularly described herein.

Preferably, the bonding formations are provided continuously along a surface of a least one web portion of the roofing component.

More preferably, the bonding formations are in the form of a plurality of space-apart wedge shaped formations that is, of a truncated triangular form to trap a hardened coating material within the channel section The roofing component may be in the form of an elongate roofing component adapted to extend along an edge portion of a roof.

Advantageously, the elongate roofing component together with its integral bonding formations is in the form of an extrusion of thermoplastics material.

Roofing components may be provided with web portions mutually oriented at an angle to suit a desired purpose.

Elongate roofing components incorporating bonding formations in the form longitudinally extending undercut channels are preferably formed by extrusion Roofing components in accordance with this invention may be in the form of corner pieces for use at internal or external roof corners for co-operation with drip edge or water check trims or even both types of trim, meeting at an internal or an external corner of the roof.

to Preferably the corner pieces are produced as pvcU injection moldings. Preferably bonding formations are provided on an internal or external web surface of a corner piece by fixing thereto a bonding strip incorporation bonding formations on one surface thereof. A bonding strip may be adhesively fixed, or alternatively fixed by solvent welding on the surface opposite to the bonding formations to a surface of at least one web of a molded roofing Is component. A bonding member incorporating bonding formations is preferably formed by extrusion and cut to length for fixing to a molded corner piece.

It has been found I particular that commonly used GRP resins may be adequately bonded to the trim members of the invention enabling GRP roof structure to incorporate the novel pvcU and other thermoplastic trims, flashings and the like which have previously not been used with liquid applied coatings because of bonding failure.

Other liquid coatings which suffer from surface -bonding failure to other substrates may also be used with roofing components of the invention which allows the seamless application of liquid-applied coatings over a main roof surface and at horizontal, vertical or diagonal junctions formed with components constructed from materials such as pvcU which have no inherent capacity to surface bond with known liquid applied coatings such as GRP.

A roofing component having a down turned section commonly is known as a drip edge trim' in the industry, is designed to shed water that may discharge onto the vertical face of the drip edge trim and onto the building substructure. Advantageously, a roofing component in the form of a drip edge trim in accordance with the invention is provided with a return section along the bottom edge portion of the vertical leg of the drip edge. The return section not only assists the discharge water away from the building sub-structure but also stops capillary flow of water occurring between the vertical leg of the drop edge and the adjacent building surface A further advantage of the return section edge is that such that two or more trim section can be interlocked edge to edge by means of an edge connector located in adjacent end portions of the overlapping returned edges portions, allowing movement of the overlapping joints and thereby avoiding movement fractures which are otherwise prone to occur with end joints which are fixed.

Preferably, concealed fixing means are provided for the drip edge trim one edge portion of the fixing means being retained with the return edge, the opposed edge portion being securable to the building surface and more preferably the edge connectors are adapted to provide concealed fixing means. The edge connectors are preferably fabricated from a resilient durable material such as a shatterproof GRP composition.

The fifth aspect is the use of a hidden fixing which has also been invented to fit into the designed concept of the drip edge trim and ensures that a clean, pristine finish is maintained throughout without the general use of an unsightly face fixing. The composition of the hidden fixing is a specific formula that makes the material shatterproof.

is This invention disclosed herein presents a solution which seeks to solve or at least mitigate the problems associated with roof edge details in a practical and cost effective way.

In order that the invention may be more clearly understood seven embodiments of roofing components in accordance with the invention will now be described by way of example only with reference to the accompanying drawings in which:-Figure 1 -is a perspective view of a first embodiment of a roofing component in accordance with the invention in the form of drip edge trim.

Figure 2 -is a cross section of the drip edge component shown in Figure 1 Figure 3 is a relatively enlarged cross sectional view of the wedge-shaped bonding formation detail shown in Figures 1 and 2.

Figure 4 is a magnified cross sectional view of one element of the wedge-shaped bonding formations shown in Figure 3.

Figure 5 is a perspective view of a second embodiment of a roofing component the form of a water check edge trim.

Figure 6 is a cross sectional view of the water check edge trim component shown in Figure 5, shown in use disposed along a roof edge.

Figure 7 is a perspective view of a third embodiment of a roofing component in the form of an external corner piece for use with meeting external drip edge trims.

Figure 8 is an end view of the component from the direction A shown in Figure 7 Figure 9 is a perspective view of a fourth embodiment of a roofing component in the form of an internal corner piece for use with meeting internal drip edge trims.

Figure 10 is art end view from one end A of the component shown in Figure 9.

Figure 11 is a perspective view of a fifth embodiment of a roofing component in the form of an external corner piece for use with meeting water check edge trims Figure 12 is an end view from direction A of the component shown in Figure 11.

Figure 13 is a perspective view of a sixth embodiment of a roofing component in the form of an internal corner piece for use with a water check trim meeting a drip edge trim.

Figure 14 is an end view from direction A of the component shown in Figure 13 Figure 15 is an end view from direction B shown in Figure 13.

Figure 16 is a perspective view of a seventh embodiment of a roofing component in the form of a fillet angle trim.

Figure 17 is a cross sectional view of the fillet angle trim component shown in Figure 16.

Figure 18 is a perspective view of two components of the kind illustrated in Figure 1 connected together in overlapping end-to end relationship.

IS Referring to the drawings, Figuresl and 2 represents an elongate roofing component in the form of an extruded pvcU drip edge trim component shown generally as 1 which may be of any required length. The component has a first web portion 3 which in use lies parallel to the plane of a roof 100 (Figure 6) and a second web portion 5 which extends vertically downwardly at the roof edge. The upper surface of the web 3 is provided with a series of seven parallel undercut ribs 7 forming the sidewalls of a series of correspondingly shaped open channel section 7(a) having wedge-shaped side walls described and illustrated in further detail below with reference to Figures 3 and 4.

In use, the channel sections are filled by a liquid applied GRP resin coating, not shown the wedge shaped channel sections being shaped to interlock with hardened resin material enclosed within the channel profiles to provide a strong mechanical bond between web portion 3 of the roofing component and the liquid applied resin coating which resists separation under applied loads or stress. The vertical web portion 5 has a good quality external finish and is formed along its lower edge portion with a U-shaped return section 9 on the interior side of the web portion 5 which also serves to prevent capillary flow of water on the interior side of the vertical web 5.

A connector strip 11 of a strong shatter-proof and resilient GRP material which may be nailed or screwed without pre -drilling is used to connect two drip edge trim or two water check trim components as referred to below in overlapping end-to end relationship, as shown in Figure 18 in the case of a drip edge trim, The lower longitudinal edge portion of strip 11 is located in close-fitting relation in the adjacent U shaped return sections of end-wise overlapping trim components the opposed upper edge portion of the strip 11 being securable by fixings 13, to the roof sub-structure, to provide a concealed fixing, as shown more clearly in figure 6, in relation to the identical concealed fixing arrangement for a water check trim component. The concealed fixing arrangement while restricting rattling and lateral movement at the same time allows relative longitudinal movement of the connected components, arising through thermal expansion and contraction and which may thereby improve the service life of the roof assembly.

To facilitate the end-to end overlap of such trim components, the upstanding interior leg 15 (Figure 2) located at one end portion of trim component 1 is cut back along the longitudinal axis of the trim to allow a minimum overlap of at least 50mm of an end-wise connected component and to permit the approximate alignment of adjacent return sections. To maintain effectiveness of the return section with respect to restricting capillary flow, a minimum 3mm height of the interior leg along the cut back section is retained in the is embodiment illustrated. Figure 18 illustrates the location of silicone sealant bead z2 at the exposed joint and spaced apart inboard beads, zi the silicone material being of sufficiently low modulus of elasticity to accommodate the expected relative movement of the components in use.

Referring to Figures 3 and 4 the series of spaced apart rib formations 7 (Figures 1 and 2) are shown in relatively enlarged detail in Figure 3. The details of a single rib formation are illustrated in Figure 4. Ribs 7 are integrally formed by extrusion on the upper surface of web portion 3 of the pvcU trim component 1. In cross section the ribs 7 take the form of a truncated triangular form the widest part of the rib being at the outermost projecting surface.

Complimentary channel formations 7(a) are formed between adjacent ribs 7 having a base portion bilaterally tapering outwardly toward a relatively narrow channel mouth. Angle d4 (Figure 4) is less than 80 degrees to optimize mechanical bond strength with conventional GRP liquid applied coatings.

Referring to Figures 5 and 6, Figure 5 represents roofing component in the form of a section of pvcU water check trim profile of any length which is similar in all respects to component described above except that the upper web 4 is not only provided with bonding formations 7, 7(a) as already described with reference to Figures 3 and 4 but also a water check barrier 4 designed to prevent water flowing from the roof surface down the vertical web portion 5. The return edge 9 and concealed fixing means 11, 13 are identical to the features described above with reference to Figures 1 and 2 the upper web portion 4 has a horizontal marginal edge portion lying on top of the roof substructure the upper surface of which is provided with extruded bonding formations 7.7(a) and a water check barrier portion 4(a) inclined to the horizontal at an angle e which may normally vary between 25 and 75 degrees according to requirements and is typically 45 degrees.

Referring to Figures 7 a roofing component ii, the form of a molded pvcU external corner piece 20 having first and second web portions 22, 23 is provided for use with two drip trim components, not shown, of the kind described with reference to Figures 1 and 2. The webs 22, 23 of molding 20 each has a free end portion 28 which joins the upper webs 22, 23 respectively through an short inclined portion 30. An extruded pvcU bonding strip 26 having bonding formations 7, 7(a) as and for the purpose described above with reference to Figures 3 and 4 is attached by solvent welding to the upper surface of web 22 and 23.

Figure 8 shows the corner piece 20 positioned with respect to a drip trim profile 1 as described above. The vertical web 24 terminates in a lower free edge 24a The marginal edge portion 28 and inclined wall section 30 of the webs 22 and 23 respectively allows for the interface of the component with the liquid applied GRP material and aligns the vertical height of marginal free end 28 with the height of the adjacent edge of the trim component 1 to provide a smooth finish at the interface of the bonded component and the roof.

Figures 9 and 10 illustrate a roofing component in the form of a molded pvcU internal corner piece for meeting drip trim component profiles 1 but which is otherwise similar in design operation and use to the external corner component described above with reference to Figures 7 and 8, like parts in Figures 9 and 10 being numbered with like numerals to the like parts in Figures 7 and 8.

Figures 11 and 12 illustrate an external corner piece 50 for meeting water check trims 17 described with reference to Figures 5 and 6 are similar to Figures 7 and 8 with like parts being numbered with like numerals.

Figures 13, 14 and 15 illustrate an asymmetrical internal corner piece 60 for co-operation with a water check trim and a drip edge trim are similar to Figures 7 and 8 with like parts being numbered with like numerals Figure 16 illustrates a perspective view of a roofing component in the form of an extruded pvcU fillet angle trim component 70 having an internally finished surface 71 and unequal first and second web portions 22, 23 interconnected by a fillet web 32. Each of the web portions 22, 23 is provided with bonding formations 7, 7(a) as previously described, disposed on exposed surfaces 34 of the web portions when component 70 is disposed in use at the junction of a roof with an upstanding wall or abutment surface. Web portion 23 is bonded above a substantially horizontal roofing sub structure and web portion 22 optionally bonded to a substantially vertical surface at a vertical wall by the application of a liquid applied coating as previously described. Alternatively, web portion 22 may serve as a pre-finished up stand without the application of a bonding coat, a cover flashing being provided, not shown, to cover the upper exposed edge portion of web 23. The dimensions of web portions 22 and 23 shown as a' and b' respectively, being unequal to facilitate such dual purpose use., a greater vertical height of web 22 being required compared with the width of web 23 required for adequate bonding with a liquid applied coating.

Claims

What we claim is:- 1. A roofing component having a first web disposable

parallel to a marginal edge portion of a roof said first web being provided with bonding formations on an upper surface of the first web to provide a mechanical interlocking bond with a settable liquid applied coating and a second web extending at an angle with respect to the first web.

2 An extruded thermoplastics roofing component as claimed in Claim 1 in which the bonding formations are formed integrally. I0

3. A roofing component as claimed in Claim 1 or 2 in which the bonding formations are provided on one surface of extruded bonding strip the opposed surface being fixed to the first web of the building component.

Is 4 A roofing component as claimed in Claims 1-3 in which the bonding formations are in the form of a series of spaced apart undercut channel formations.

5. A roofing component as claimed in Claim 4 in which each channel has a wedge shaped cross sectional form for mechanically interlocking with a set liquid applied coating.

6 A roofing component as claimed in Claims 1-5 in which the first and second webs are inclined substantially at right angles to each other.

7. A thermoplastics roofing component as claimed in any preceding Claim which is surface finished on a surface intended to be exposed when the component is in situ.

8. A roofing component as claimed in any preceding claim in the form of an elongate trim having a first web disposable parallel to a marginal edge portion of a roof, and a second web extending downwardly from the edge of the roof, terminating in a returned edge formation to prevent the capillary flow of water between the second web and the adjacent building structure.

9. A roofing component as claimed in Claim 8 in which the returned edge formation is adapted to receive a connecting strip for connecting elongate roofing components together in overlapping end to end relationship so as to accommodate relative thermal movement between the connected components.

10. A roofing component as claimed in Claim 9 in which the connecting strip projects from the returned edge formation to provide concealed fixing means for fixing the roofing component to the adjacent building structure.

11. A roofing component as claimed in Claim 10 in which the connecting strip is a strong resilient shatterproof GRP material which may be directly nailed or screwed to the adjacent building structure without the need for pre-drilling of the connecting strip (0 12.A roofing component as claimed in Claims 8-11 is in the form of an elongate drip edge trim having a substantially planar first web which allows water to flow from the roof down the second web which serves as a drip edge.

13. A roofing component as claimed in Claims 8-11 in the form of an elongate water is check edge trim having a first web incorporating bonding formations and a raised water check barrier to restrict the flow of water from the roof over the second web.

14. A roofing component as claimed in Claims 8-11 in the form of a fillet angle trim member having a first web which in use lies parallel to an edge portion of a roof and a second web which lies parallel to an upstanding wall or vertical abutment surface the first and second webs being interconnected by a fillet angle web, bonding formations being provided along the marginal edge portions of the first and second webs.

15. A roofing component as claimed in claims 3-7 in the form of a corner piece for use at an internal or external roof corner for co-operation with first and second elongate roof components disposed along respective adjacent edges of the roof.

16. A corner piece as claimed in Claim 15 in the form of a thermoplastics molding having first and second webs disposed at right angles for overlapping cooperation with the respective first and second elongate roofing components the said webs being provided with bonding formations for mechanical interlocking with a liquid applied coating.

17. A roofing component substantially as described with reference to Figures 1-4.

18. A roofing component substantially as described with reference to Figures 5 and 6 I0 19. A roofing component substantially as described with reference to Figures 7 and 8.

20. A roofing component substantially as described with reference to Figures 9 and 10.

21 A roofing component substantially as described with reference to Figures 11 and 12.

22. A roofing component substantially as described with reference to Figuresl3-15.

Jo 23. A roofing component substantially as described with reference to Figures 16 and 17.

II