GB2507478A

GB2507478A - Flashing engaging and guiding member

Info

Publication number: GB2507478A
Application number: GB201217450A
Authority: GB
Inventors: Sean Coyle
Original assignee: Keystone Lintels Ltd
Current assignee: Keystone Lintels Ltd
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2014-05-07
Also published as: GB201217450D0

Abstract

At least part of a building component such as a dormer window unit 8 or chimney adapted for incorporation into a pitched roof 4, the at least part of the building component comprising at least one flashing engaging and guiding member 2. The at least one flashing engaging and guiding member being engagable with a corresponding flashing 5 so as to maintain the flashing in a downwardly sloping direction.

Description

A FLASHING ARRANGEMENT FOR A DORMER WINDOW UNIT OR CHIMNEY

The present invention relates to a flashing arrangement for a part of a building component such as a prefabricated dormer window unit or chimney and in particular to a flashing arrangement for a glass reinforced plastic (GRP) or similar composite material dormer window unit or chimney incorporated in a roof structure.

The installation of pre-fabricated roof mounted construction components such as dormer windows and chimney components requires a cut out in the weather proofing structure of the roof and often leaves the portion of the roof in question vulnerable to ingress to of moisture. As a result, adequate moisture barriers must be provided around the dormer window or chimney. An area of particular weakness for such installations is the lowest point of the dormer window or chimney on the downwards slope of a pitched roof. The transitional area at this front portion of the dormer window or chimney is typically provided with a flashing element to encourage water to run downwards along the slope of the pitched roof and/or Is from the dormer window or chimney and directly onto the roof covering material below, wherein the water will continue to drain off the roof.

An issue arises with the typical methods of achieving this result (an example of which is shown in figure A) in that the flashing RF is often filled at an angle which can allow water to gather and potentially penetrate between the roof R and the dormer window or chimney C, or cause damage due to exposure over time. An issue arises as the level of the bottom apron B of the composite Dormer or Chimney relative to the level of the roof covering (RC) is too low. Hence an abrupt angle is formed at (B) with the secondary flashing (RF) used to direct rain water up and onto the roof covering (RC). Water W gathers at this point and leaks into the main roof structure through filler material (M).

25. While attempts are typically made to support the flashing F, the success of these attempts are usually determined by the skill of the installer and are often futile if the flashing F is not inclined at a satisfactory angle.

Additionally, a portion of the flashing RE typically extends between the dormer window or chimney and the roof, causing the dormer window or chimney to be raised at its front end to accommodate the flashing RE thereunder. This raising of the dormer window or chimney means that it cannot be located correctly on the rafters of the roof and, as a result, vulnerable points arise which may allow ingress of water. Typically, raising the front end of a dormer unit to accommodate the flashing can cause a shift of 20 millimeters to 30 millimeters at the top of the unit, causing the front face of the dormer to sit non-vertically.

It is an object of the present invention to obviate or mitigate the problem of the flashing around a dormer window unit or chimney causing points of vulnerability or having surfaces which may encourage moisture to gather and therefore cause damage or result in ingress of moisture.

Accordingly, the present invention provides at least part of a building component such as a dormer window unit or chimney adapted for incorporation into a pitched roof, the at least part of a building component comprising at least one flashing engaging and guiding means, Is the at least one flashing engaging and guiding means being engagable with a corresponding flashing so as to maintain the flashing in a downwardly sloping direction.

Ideally, at least a portion of the flashing engaging and guiding means is inclined away from a section of the pitched roof locatable there below whilst retaining the inclined portion in a downwardly sloping direction.

Ideally, the inclined portion of the flashing engaging and guiding means directs the angle of projection of the flashing at an incline from its original direction parallel to the downwards slope of the section of the pitched roof having the flashing engaging and guiding means locatable thereon.

Advantageously, the flashing is directed at an angle such that water running in the downwards sloping direction of the pitched roof travels over the flashing engaging and guiding means and the flashing without collecting on any portion of these components.

Ideally, the flashing engaging and guiding means is formed integrally with the at least part of the building component such as a dormer window unit or chimney.

Alternatively, the at least part of the building component is provided by a separable component detachably mountable on a building component such as a dormer window unit or chimney.

Preferably, the at least part of the building component has an upper end and a lower end, the lower end being locatable lower on the downwardly sloping surface of the pitched roof than the upper end.

Alternatively, where the at least part of the building component is locatable at an apex of the pitched roof, the at least part of the building component may have more than one lower end.

Preferably, where the at least part of the building component is locatable at an apex of the pitched roof, the at least part of the building component has two lower ends, one lower end being locatable on each downward slope of the pitched roof.

Ideally, the flashing engaging and guiding means is locatable along a front end of the at least one lower end of the at least part of the building component.

Preferably, the flashing engaging and guiding means is a projection extending from the front edge of the at least one lower end of the at least part of the building component.

Ideally, the flashing engaging and guiding means projects from the at least part of the building component in the general direction of the portion of the downwards slope of the pitched roof locatable there below.

Preferably, the portion of the flashing engaging and guiding means which is inclined away from the pitched roof locatable there below whilst maintaining a downwardly sloping direction is a flashing engaging surface.

Ideally, the flashing engagement surface has a first portion extending from the at least part of the building component and being generally parallel with the portion of the downwards slope of the pitched roof locatable there below.

Preferably, the flashing engagement surface has a second portion extending from the first portion which is inclined away from but in the general downwardly sloping direction of the portion of the pitched roof locatable there below.

Ideally, the flashing is coupleable to the flashing engagement surface.

Preferably, the flashing engagement surface directs the flashing onto an exposed non-roof facing outer surface of a roof covering material.

Preferably, the flashing is further supported in its downwardly inclined orientation by a flashing support means.

Ideally, the flashing support means is locatable between the flashing and the pitched roof.

Preferably, the flashing support means comprises a board or plate in contact with a roof facing side of the flashing.

Ideally, the flashing engaging member is a generally planar member.

Preferably, the first and second portion of the flashing engaging member are inclined at an obtuse angle to one another.

Ideally, the flashing engaging and guiding member is integrally formed with the main body of the at least part of the building component.

Is Ideally, the flashing support means further comprises a means for holding the board or plate against the roof facing side of the flashing.

Ideally, the flashing support means prevents movement or sagging of the flashing between the flashing engaging and guiding means and the roof covering material.

Preferably, the flashing support means is a tilting fillet.

Advantageously, as the flashing engagement and guiding means dictates the angle of incline of the flashing, the flashing support means must only be fitted to support the already defined incline of the flashing. This prevents an individual installing the flashing utilising a flashing support means which inclines the flashing at an incorrect angle.

Further advantageously, as the flashing is correctly inclined and supported from beneath, no depressions can form in the flashing which may allow water to gather.

Ideally, the roof covering material comprises roof tiles.

Preferably, the roof has tiling battens for the positioning and attachment of the roof tiles.

Ideally, the distance between a frontmost extremity of the flashing engaging and guiding means and a closest tiling batten locatable downslope from the at least part of the building component on the pitched roof is at most 75 millimeters.

Advantageously, this allows the flashing to be fitted at an angle which does not permit water to gather thereon. A smaller gap between the front of the flashing engaging and guiding means and the closest batten would allow the flashing to be inclined at a steeper angle with respect to the downwards slope of the pitched root and therefore facilitate water gathering on the flashing.

Ideally, the flashing is continuous and extends from a location between the at least part of the building component such as the dormer window unit or chimney and the pitched roof, to a position on the exposed non-roof facing outer surface of the roof covering material.

Preferably, a means for locating the flashing between at least part of a building component such as a dormer window unit or chimney and the pitched roof is provided.

Ideally, the means for locating the flashing between the at least part of the building component such as the dormer window unit or chimney and the pitched roof comprises a recess formed in a roof contacting surface of the at least part of the building component such as the dormer window unit or chimney.

Preferably, the recess extends from the front edge of the at least one lower end of the at least part of the building component such as the dormer window unit or chimney a distance along the roof contacting surface of the dormer window unit or chimney in the generally upwards sloping direction of the portion of the pitched roof locatable thereon.

Ideally, the recess extends parallel to the generally upwards sloping direction of the portion of the pitched roof locatable thereon.

Ideally, the recess is deep enough to accommodate at least one layer of the flashing therein without causing the at least part of the building component such as the dormer window unit or chimney to raise or tilt.

Advantageously, the recess means that the flashing can be fitted between the pitched roof and the at least part of the building component such as the dormer window unit or chimney without the need for the dormer window unit or chimney to be tilted or raised to accommodate the flashing. This is useful because such tilting or raising can result in areas of vulnerability which are susceptible to moisture ingress.

Preferably, the flashing is mechanically coupleable to a roof facing surface of the recess.

Alternatively, once the flashing is located in the recess it is held in place between the at least part of the building component such as the dormer window unit or chimney and the roof by a downwards force exerted by the dormer window unit or chimney.

In an alternative arrangement, the flashing is coupled to the inclined portion of the flashing engaging and guiding means only. In this embodiment, because the flashing does not extend between the roof and the at least part of the building component there is no requirement to form a recess.

Ideally, the at least pail of the building component such as the dormei window unit oi chimney is at least partly constructed from a composite material.

Preferably, the at least part of the building component such as the dormer window unit or chimney is at least partly constiucted from glass reinforced plastic.

Preferably! the at least pad of the building component is at least partly manufactured from a composite member having a polymeric matrix reinforced with fibres.

Ideally, the at least pait of the building component is at least partly manufactured from fiber-reinforced polymers, FRPs, carbon-fiber reinforced plastic CFRP or glass-reinforced plastic GRP.

Preferably, the matrix is provided by a thermoplastic composite.

Ideally, the thermoplastic composite is a short fiber thermoplastics, a long fiber thermoplastics or a long fiber-reinforced thermoplastics.

Alternatively, the matrix is provided by a thermoset composite.

Ideally, the at least part of the building component at least partly comprises aramid fibre and carbon fibre in an epoxy resin matrix.

Preferably, the FRPs include wood comprising cellulose fibers in a lignin and hemicellulose matrix.

The invention will now be described with reference to the accompanying drawings which show by way of example only one embodiment of an arrangement in accordance with the invention.

Figure A shows a prior art solution comprising a dormer window unit having a flashing with a substantially horizontal portion where water collects providing no inclining flashing nor recess for location of the flashing under the dormer; Figure 1 is a detail vertical sectional view of one embodiment of the invention; Figure 2 is a sectional side view of one embodiment of the invention; Figure 3 is a perspective detail view of a corner section of one embodiment of the invention; and Figure 4 is a perspective view of one embodiment of the invention.

Is In the drawings, there is shown at least part of a building component indicated generally by the reference numeral 1 having a flashing engaging and guiding member 2 formed integrally with a dormer window unit 3. A portion 11 of the flashing engaging and guiding member 2 is inclined away from but in the general downwardly sloping direction of the pitched roof 4. The flashing engagement and guiding member 2 engages the flashing 5 and directs the angle of projection of the flashing 5 at an incline from its original direction parallel to the downwards slope of the pitched roof 4 such that water running in the downwards sloping direction of the pitched roof 4 travels over the flashing engaging and guiding member 2 and the flashing 5 without collecting on any portion of these components.

The dormer window unit has an upper end 6 and a lower end 7, the lower end 7 being located lower on the downwardly sloping surface of the pitched roof 4 than the upper end 6.

The flashing engagement and guiding member 2 is located along the front edge 8 of the lower end 7 of the dormer window unit 3 and extends therefrom in the general direction of the downwards slope of the pitched roof 4. The flashing engagement and guiding member 2 has a flashing engagement surface 9 comprising a first portion 10 extending from the dormer window unit 3 and being generally parallel with the downwards slope of the pitched roof 4.

The flashing engagement surface 9 has a second portion 11 extending from the first portion 10, the second portion 11 being inclined away from but in the general downwardly sloping direction of the pitched roof 4. The flashing 5 is coupled to the flashing engagement surface 9 which directs the flashing 5 onto the exposed outer surface of the roof tiles 12.

The flashing 5 is further supported in its inclined position by a tilting fillet 13 located between the flashing 5 and the roof 4. The tilting fillet 13 comprises a board 14 in contact with the roof facing side of the flashing 5 and a support 15 for holding the board 14 against the roof facing side of the flashing 5. The tilting fillet 13 prevents movement or sagging of the flashing 5 between the flashing engaging and guiding member 2 and the roof tiles 12. As the flashing engagement and guiding member 2 dictates the angle of incline of the flashing 5, the tilting fillet 13 must only be fitted to support the already defined incline of the flashing 5. This prevents an individual installing the flashing 5 using a flashing support which inclines the Is flashing 5 at an incorrect angle. As the flashing 5 is correctly inclined and supported from beneath, no depressions can form in the flashing 5 which may allow water to gather.

The flashing 5 is continuous and extends from a first location 16 between the dormer window unit 3 and the pitched roof 4, to a second location 17 on the exposed outer surface of the roof tiles 12. A recess is formed in the pitched roof facing surface 18 of the dormer window unit 3 to allow fitting of the flashing 5 between the dormer window unit 3 and the pitched roof 4. As a result, the flashing 5 can be fitted between the pitched roof 4 and the dormer window unit 3 without the need for the dormer window unit 3 to be tilted or raised to accommodate the flashing 5 as such tilting or raising can result in areas of vulnerability which are susceptible to moisture ingress.

The dormer window unit 3 is constructed from glass reinforced plastic material and the flashing 5 is lead flashing.

In relation to the detailed description of the different embodiments of the invention, it will be understood that one or more technical features of one embodiment can be used in combination with one or more technical features of any other embodiment where the transferred use of the one oi moie technical features would be immediately apparent to a person of ordinary skill in the art to carry out a similar function in a similar way on the other embodiment.

In the pieceding discussion of the invention, unless stated to the contrary, the disclosure of alternative values for the upper or lower limit of the permitted range of a parameter, coupled with an indication that one of the said values is more highly preferred than the other, is to be construed as an implied statement that each intermediate value of said parameter, lying between the more preferred and the less preferred of said alternatives, is itself preferred to said less preferred value and also to each value lying between said less preferred value and said intermediate value.

The features disclosed in the foregoing description or the following drawings, expressed in theft specific forms ci in terms of a means for performing a disclosed function, or a method or a process of attaining the disclosed result, as appropriate, may separately, or in any combination of such features be utilised for realising the invention in diverse forms thereof.

Claims

CLAIMS1. At least part of a building component such as a dormer window unit or chimney adapted for incorporation into a pitched roof, the at least part of the building component comprising at least one flashing engaging and guiding means, the at least one flashing engaging and guiding means being engagable with a corresponding flashing so as to maintain the flashing in a downwardly sloping direction.
2. At least part of a building component as claimed in claim 1, wherein at least a portion of the flashing engaging and guiding means is inclined away from a section of the pitched roof locatable there below whilst retaining the inclined portion in a downwardly sloping direction.
3. At least part of a building component as claimed in claim 2, wherein the inclined C') portion of the flashing engaging and guiding means directs the angle of projection of is the flashing at an incline from its original direction parallel to the downwards slope of the section of the pitched roof having the flashing engaging and guiding means C, locatable thereon.
4. At least part of a building component as claimed in any one of the preceding claims, wherein the flashing engaging and guiding means is formed integrally with the at least pad of the building component such as a dormer window unit or chimney.
5. At least part of a building component as claimed in any one of claims ito 3, wherein the at least part of the building component is provided by a separable component detachably mountable on a building component such as a dormer window unit or chimney.
6. At least part of a building component as claimed in any one of the preceding claims, wherein the at least pad of the building component has an upper end and a lower end, the lower end being locatable lower on the downwardly sloping surface of the pitched roof than the upper end.
7. At least part of a building component as claimed in claim 6, wherein where the at least part of the building component is locatable at an apex of the pitched roof, the at least part of the building component may have more than one lower end.
8. At least part of a building component as claimed in claim 7, wherein where the at least part of the building component is locatable at an apex of the pitched roof, the at least part of the building component has two lower ends, one lower end being locatable on each downward slope of the pitched roof.
9. At least part of a building component as claimed in any one of claims 6 to 8, wherein the flashing engaging and guiding means is locatable along a front end of the at least one lower end of the at least part of the building component.
10. At least part of a building component as claimed in any one of claims 6 to 9, wherein the flashing engaging and guiding means is a projection extending from the front C') edge of the at least one lower end of the at least part of the building component.
11. At least part of a building component as claimed in any one of claims 6 to 10, wherein 0) the flashing engaging and guiding means projects from the at least part of the 0 building component in the general direction of the portion of the downwards slope of the pitched roof locatable there below.
12. At least part of a building component as claimed in any one of claims 6 to 11, wherein the portion of the flashing engaging and guiding means which is inclined away from the pitched roof locatable there below whilst maintaining a downwardly sloping direction is a flashing engaging surface.
13. At least part of a building component as claimed in claim 12, wherein the flashing engagement surface has a first portion extending from the at least part of the building component and being generally parallel with the portion of the downwards slope of the pitched roof locatable there below.
14. At least part of a building component as claimed in claim 13, wherein the flashing engagement surface has a second portion extending from the first portion which is inclined away from but in the general downwardly sloping direction of the portion of the pitched roof locatable there below.
15. At least part of a building component as claimed in any one of claims 12 to 14, wherein the flashing is coupleable to the flashing engagement surface.
16. At least part of a building component as claimed in any one of claims 12 to 15, wherein the flashing engagement surface directs the flashing onto an exposed non-roof facing outer surface of a roof covering material.
17. At least part of a building component as claimed in any one of the preceding claims, wherein the flashing is further supported in its downwardly inclined orientation by a flashing support means.
18. At least part of a building component as claimed in claim 17, wherein the flashing support means is locatable between the flashing and the pitched roof.

C')
19. At least part of a building component as claimed in claim 17 or 18, wherein the flashing support means comprises a board or plate in contact with a roof facing side ow) of the flashing.
20. At least part of a building component as claimed in any one of claims 17 to 19, wherein the flashing support means further comprises a means for holding the board or plate against the roof facing side of the flashing.
21. At least part of a building component as claimed in any one of claims 17 to 20, wherein the flashing support means prevents movement or sagging of the flashing between the flashing engaging and guiding means and the roof covering material.
22. At least part of a building component as claimed in any one of claims 17 to 21, wherein, the flashing support means is a tilting fillet.
23. At least part of a building component as claimed in any one of claims 13 to 22, wherein the first and second portion of the flashing engaging member are inclined at an obtuse angle to one another.
24. At least part of a building component as claimed in any one of the preceding claims, wherein the roof covering material comprises roof tiles, the roof having tiling battens for the positioning and attachment of the roof tiles wherein the distance between a front most extremity of the flashing engaging and guiding means and a closest tiling batten locatable down slope from the at least part of the building component on the pitched roof is at most 75 millimeters.
25. At least part of a building component as claimed in any one of the preceding claims, wherein a means for locating the flashing between at least part of a building component such as a dormer window unit or chimney and the pitched roof is provided, the means for locating the flashing between the at least pad of the building component such as the dormer window unit or chimney and the pitched roof comprises a recess formed in a roof contacting surface of the at least part of the building component such as the dormer window unit or chimney.
26. At least part of a building component as claimed in claim 25, wherein the recess is C') deep enough to accommodate at least one layer of the flashing therein without causing the at least pad of the building component such as the dormer window unit or ow) chimney to raise or tilt.
27. At least part of a building component as claimed in any one of claims 2 to 24, wherein the flashing is coupled to the inclined portion of the flashing engaging and guiding means only.
28. At least part of a building component as claimed in any one of the preceding claims, wherein the at least part of the building component such as the dormer window unit or chimney is at least partly constructed from a composite material.