Roof flashing assembly

Abstract

The present invention relates to a roof flashing assembly for use on a sloped roof surface having an elongate projection extending substantially upwardly therefrom in skewed relation thereto. The roof flashing assembly has a resilient, flexible, sleeve sized to fit over, and surround, the projection. The sleeve has a base portion, a neck portion and a passageway defined therebetween for receiving the projection therethrough. A bellows tube is formed on the neck portion to permit the sleeve to flex adaptively to accommodate for the skewed orientation of the projection relative to the sloped roof surface. The roof flashing assembly also includes a grommet which is positionable in surrounding relation with the projection. The grommet has three beveled lip members, which frictionally sealingly engage the exterior surface of the projection when urged in abutting relation therewith. An annular gasket positionable below the base portion of the sleeve, is also provided. The gasket frictionally sealingly engages the external surface of the projection. When urged in abutting relation with the sloped roof surface, flexible ring seal members formed on the underside of the gasket create a watertight seal with the roof surface. During installation, anchoring means are used to secure the sleeve and the gasket to the sloped roof surface.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a roof flashing assembly used to provide watertight and weather resistant seals between a sloped roof surface and an upwardly projecting member such as a pipe or vent stack. BACKGROUND OF THE INVENTION [0002] Roof flashing is conventionally used to provide a waterproof and weather resistant seal around pipes, vent stacks and other elongate members projecting through roofs. Roof flashing is generally constructed from sheet metal, flexible moulded rubber or other synthetic material formed in an appropriate shape to surround such projecting members, and is normally made to extend slightly above the level of the roof, to limit the penetration of precipitation therebelow. [0003] Roof leaks result in costly repairs for building owners and roofers. In northern climates condensation and leaks at roof protrusions caused by roof flashing products are the most common reason for roofing failure. It is believed that condensation prob...

AI Technical Summary

Benefits of technology

[0015] In a further additional feature, the outer flange portion has at least one resilient ring seal member downwardly depending from its lower surface. The at least one ring seal member has a generally triangular profile when viewed in cross-section. Additionally, the at least one ring seal member tapers downwardly from the lower surface of the outer flange portion to terminate at a free edge. The free edge of the at least one ring seal member is urged to bear against the roof surface in frictional sealing engagement therewith when the roof flashing assembly is o...

Problems solved by technology

Roof leaks result in costly repairs for building owners and roofers.

In northern climates condensation and leaks at roof protrusions caused by roof flashing products are the most common reason for roofing failure.

It is believed that condensation problems alone are responsible for as much as 80 percent of all roof leaks.

The ice thus formed melts during the spring and eventually leaks into the structure.

Despite the availability of insulated roof flashings, many installers elect, because of cost, to use non-insulated flashings.

However, even when insulation is used, it has been found that condensation problems tend to persist to an unacceptable degree.

Although there often is vapor barrier, insulation material and flashing to protect from leakage and condensation, it has been found that condensation may still result if the flashing assembly does not have a base seal.

However, corrugated metal roof decks, particularly sloping metal roofs, such as Butler™ roofs, present further challenges.

This device however does not appear to address the problem of condensation forming within the space defined between the interior surface of the sleeve and the elongated conduit.

A further challenge is that metal roof decking is subject to expansion and contraction from temperature change and may expand or contract up to 1¼ inches.

This expansion and contraction in the area of apertures made for roof protrusions will be a source of condensation problems in sloped roof deck applications.

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