Abstract
The invention relates to a flashing for a pipe or duct passing through a seamed roof. The flashing comprises a collar at the upper end of which is provided an opening for the pipe or duct, and a substantially flat flange to which the lower end of the collar is joined, which flange is configured to be attached to a portion of a roof, whereby a plane through the upper and lower edges of the opening in the upper end of the collar is set inclined by an angle in a range between 25 and 35 relative to the plane defined by the flange. The opening at the upper end of the collar has an oval or oblong shape, facilitating the use of the flashing at various roof pitch angles without the collar being modified.
Claims
1. A flashing for a pipe or duct leadthrough for use on a seamed roof, comprising: a collar having at its upper end an opening for the pipe or duct, the opening having an upper edge at the side of the roof ridge and a lower edge at the side of the eave, and a substantially planar flange adapted for fastening to a roof section, said flange defining a plane, wherein a plane through the upper and lower edges of the opening (A-A) is set at an angle () relative to the plane (B-B) defined by the flange, said angle () being in the range 25 to 35 degrees; and the projection of the opening into the plane through the upper and lower edges of the opening is oblong.
2. The flashing according to claim 1, wherein the angle () is 30 degrees.
3. I e flashing according to claim 1, further comprising having a raised portion on the flange at the side of the roof ridge, providing a groove between the raised portion and the collar.
4. The flashing according to claim 1, further comprising having a seal of thermoplastic polymer on the undersurface of the flange.
5. The flashing according to claim 4, wherein the width of the seal is greater at the edge facing the roof ridge than at the other edges.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 represents a first perspective view of a flashing for a pipe duct in accordance with at least some embodiments of the present invention,
[0022] FIG. 2 represents a second perspective view of a flashing for a pipe duct in accordance with at least some embodiments of the present invention,
[0023] FIG. 3 represents a perspective view of a prior art pipe having a fixed dome-shaped portion being fitted to a flashing according to an embodiment of the present invention,
[0024] FIG. 4 represents a sectional side view of a flashing for a pipe duct in accordance with at least some embodiments of the present invention,
[0025] FIG. 5 represents a schematic view of an opening of a collar of a flashing for a pipe duct in accordance with at least some embodiments of the present invention.
DISCLOSURE OF EMBODIMENTS
[0026] The flashing is particularly designed for a seamed roof or for a roofing element shaped as a seamed roof. The mounting of the flashing may be carried out rapidly due to the simple and compact structure. The same flashing may be used for various roofs, each having a different pitch.
[0027] FIG. 1 shows a first perspective view of a flashing 1 according to at least some embodiment of the flashing 1 according to the present invention. The flashing 1 comprises collar 2 having an oblong opening 3 for a pipe duct (not shown), and a substantially planar flange 4. Collar 2 is thus formed, that the flashing 1 may be used for any roof pitch in the range 13 to 50. In other words, the flashing 1 may be used for various seamed roofs having a pitch in the mentioned range, for example 35. The oblong shape of opening 3 facilitates this. The plane defined by the upper and lower edges of opening 3 is inclined by an angle which is in the range 25-35 relative to the plane defined by flange 4; preferably, the angle is 30. The collar 2 in the embodiment shown is provided with four connection points 10 for attaching to an underlayment seal (not shown). The body of the flashing 1 is preferably manufactured from a polymer material, e.g. polypropene.
[0028] The opening 3 of collar 2 is dimensioned to receive commonly used pipe sizes, for example up to 160 mm.
[0029] Further, the flashing comprises a substantially planar flange 4, which is adapted for fastening to a roof section having a pitch in the range 13-50. The flashing can be mounted on top of the roofing material, and is preferably fastened using screws. According to preferable embodiments, a sealing compound e.g. silicone, is used on the undersurface of the flange 4. On the side of the roof ridge, the flange 4 is provided with a raised portion 6. The edge of a dome-shaped part (not shown) tightly fixed to the pipe duct sets between the raised portion 6 and the collar 2.
[0030] Flashing 1 is advantageously manufactured in one piece using injection molding technology.
[0031] The flashing 1 may be used on any seamed roof having a pitch in the range 13-50 due to the design of collar 2, namely the oblong shape of opening 3 and the inclination of the plane defined by the edges of opening 3. The flashing is to be mounted following the application of the weatherproofing roofing material.
[0032] FIG. 2 shows another perspective angle of a flashing according to at least some embodiments of the present invention. Between the raised portion 6 and the collar 2 is a groove 7 for receiving the edge of a dome-shaped part (not shown) water-tightly fitted to the pipe. The distance between the bottom of groove 7 and the upper edge of the collar opening 3 define the damming height of the flashing.
[0033] FIG. 3 shows how a vent pipe is mounted to a flashing according to an embodiment of the invention. The pipe 11 is provided with a dome-shaped portion 12, which is sealed to the pipe in a water-tight fashion and is preferably an integral part of the pipe section penetrating the roof The dome-shaped portion overlaps the collar 2, allowing for varying the angle between the plane determined by the flange 4 (i.e. the plane of the relevant roof section) and the vertical axis of the pipe while maintaining a configuration which does not allow entry of water or snow past the flashing. The pipe 11 is supported at the contact area between the collar 2 and the dome-shaped portion 12. Screws may be used for securing the dome-shaped portion to the collar. Thus, the pipe becomes fixed to the roof structure.
[0034] FIG. 4 shows a side view section of a roof flashing according to an embodiment of the invention. The flashing 1 comprises a collar 2 with an opening 3 for a pipe. Further, the flashing comprises a substantially planar flange 4 adapted for fastening to a section of the roof. The flashing 1 preferably comprises a seal 5 of thermoplastic elastomer integrated in its undersurface, along the edges of the flange. The integrated seal 5 is preferably made by two-component injection molding in the same step as the body of the flashing. Preferably, the width of the seal 5 is greater at the side of the roof ridge than its width at the side edges and the eave side. The sealing system is adapted to improve the durability of the sealing and to provide a tight joint especially where the water load is largest.
[0035] In the alternative, a separate seal and a single-component plastic flashing may be used.
[0036] Further referring to FIG. 4, the plane A-A through the upper and lower edges of the opening 3 is inclined by the angle , which is in the range 25-35 relative to the plane B-B in the direction of the flange. According to an advantageous embodiment, the angle is 30. The opening 3 is oblong and the collar 2 is thus adapted for mounting a pipe substantially vertically at various roof pitches, for example at any pitch angle in the range 13-50.
[0037] FIG. 5 shows a schematic view of a projection into plane A-A of the opening in collar 2 of a flashing in accordance with the invention. The figure is schematic and does not limit the shape or proportions of the opening. The opening 3 is in this example a geometrical stadium, its smaller width being marked x, and the edges which are closer to each other are in the direction of the roof pitch. The distance x is such as to receive a pipe of a diameter suitable for pipes used in the relevant field. For example, dimensions up to 160 mm are commonly used but other sizes are possible. The greatest width of the opening is marked y, and it is the distance between the upper and lower edges of the opening as set out above. The oblong shape of the opening allows for mounting a throughgoing pipe and setting it substantially vertically independently of the pitch of the roof and the flange when said pitch is in the range 13-50.
