Static structures (e.g. – buildings) – Exterior-type flashing
Reexamination Certificate
2000-04-25
2001-12-11
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Exterior-type flashing
C052S059000, C052S060000
Reexamination Certificate
active
06327820
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a kit of elements of sheet material for flashing a quadrangular roof-penetrating element, for instance a window, a chimney, a ventilating duct or the like, in an inclined roof with a substantially plane surface, which material comprises one side suited for fastening to the roof surface by gluing, adhesion, welding or the like and a second weather-proof side.
The invention further relates to a method for flashing a quadrangular roof penetrating element, for instance a window, a chimney, a ventilating duct or the like, in an inclined roof with a substantially plane surface, in particular made from concrete, by means of a kit of elements of the type mentioned above.
Danish patent No. 98982 discloses a “method for flashing corners on chimneys, dome light frames and the like protrusions on roofs with roofing felt and a bituminous sheet for use in such flashing”. According to this publication, the corners of the protrusion (the roof penetrating element) are first covered by means of small textile reinforced bituminous sheets which are slit for the formation of flaps which are bent and melted together to form closed corners, following which bituminous felt sheets are mounted, said sheets extending on the sides of the roof penetrating elements forward to but not around the corners. It is said in this patent that it is known to use roofing felt strips extending from the roof surface and somewhat upwards along a side surface of the roof penetrating element, in which the part of the roofing felt extending upwards along the vertical surface at its edge is bent around the edge, a splitting of the strip being made until the place, where the vertical edge meets the roof surface.
The above-mentioned method is further known from a working instruction from the firm Icopal. From the same working instruction it is known, on basis of a measurement of the dimensions of the roof penetrating elements, to cut elements from roofing felt, whereby cuts are made at the ends of some of the elements, said cuts extending in extension of premeditated folding lines, to make it possible to fold end portions of bent up portions of the elements around the corners of the roof penetrating element.
SUMMARY OF THE INVENTION
The object of the invention is to provide a kit of elements and a method for flashing a roof-penetrating element, said kit of elements facilitating the flashing and ensuring to a high extent that the finished flashing becomes impermeable to rainwater and the like.
This object is met by means of a kit of elements comprising
a first element with two through cuts extending convergingly from the ends of a first line segment to one edge of this element,
a second element with two through cuts, which cuts extend from each end of a second line segment obliquely to an edge of the element under formation of an acute angle with the line segment and obliquely or straight to an edge of the element under formation of an obtuse or straight angle with the line segment, respectively,
an element mirror-inverted relative to the second element,
a third element with two through cuts, which extend from each their end of a third line segment to each their respective edge of the element under formation of an obtuse or straight angle with the line segment.
In this way a kit of elements is provided which, when mounted, forms a collar around the roof penetrating element, wherein the joints between the various overlappings are facing downwards such that water on the roof will tend to run away from and not into the joints.
The first and the third element are preferably symmetrical about the half-line normals of the respective line segments, at least in respect of the cuts and the folding lines, and the four elements are preferably rectangular. This provides for easy and economical production of the elements. One or more of the elements, and in particular the second one and the element mirror-inverted relative thereto, may be divided in smaller elements transversely to their respective line segments, the smaller elements overlapping one another when mounted.
It should be understood that by the element mirror-inverted relative to the second element is meant an element having two through cuts corresponding to the through cuts in the second element, in which the angles that the cuts form with the line segment of the mirror-inverted element do not have to be identical with the angles formed by the cuts in the second element. Likewise, the outer dimensions of the mirror-inverted element do not have to be identical with the dimensions of the second element.
Said acute angles are preferably approximately 45°, the tolerance being high.
In an embodiment of the kit intended for use in flashing of several adjacent roof penetrating elements, for instance windows, the kit comprises an element with two halves, one half of which constitutes a first element, and the second half of which constitutes a third element, and/or an element with two halves, one half of which constitutes a second element, and the second half being mirror-inverted relative thereto. These further elements are used between the adjacent windows depending on whether they are placed above/below or next to one another. The kit will in this case be supplemented with further first, second mirror-inverted, and third elements according to need.
The object of the invention is further met by a method which is characterized in that
the first element is bent along the first line segment and along lines extending under 90° from the end of the line segment to the same side as the cuts, that the upwards bent portions are secured to upwards extending side surfaces of the roof penetrating element, the portion positioned between the converging cuts being secured to a downwards facing side surface, following which the remaining portions of the element are fastened by gluing, adhesion, welding or the like to the roof surface,
that the second element is bent along the second line segment and along a line which under an angle of 90° extends from the same end of the line segment and to the same side as the cut forming an acute angle, that the upwards bent portions are secured to side surfaces of the roof penetrating element, the portion positioned along the second line segment being secured to a second side surface adjacent to the downwards facing side surface and the portion forming an acute angle being placed on top, and the lower end of the portion positioned along the second line segment being bent towards and secured to the downwards facing side surface of the roof penetrating element, following which the remaining portions of the element are fastened by gluing, adhesion, welding or the like to the roof surface,
that the element mirror-inverted relative to the second element is fastened in a similar manner, and
that the third element is bent along the third line segment, that the upwards bent portion is secured to the upwards facing side surface of the roof penetrating element and that the end portions of the upwards bent portion are bent around and secured to the second side surfaces, following which the remaining portions of the element are secured by gluing, adhesion, welding or the like to the roof surface.
The new and characteristic of this method is in particular that the elements are first secured on the side surfaces of the roof penetrating element, which is easily done with the elements according to the invention, whereafter the elements thus secured are fastened to the roof surface without any risk of displacement.
The method is in particular suitable in connection with concrete roofs, where the elements are directly fastened to the concrete surface and not to a previously laid out roofing felt, as is for instance known from the above working instruction.
REFERENCES:
patent: 5018333 (1991-05-01), Bruhm
patent: 5077943 (1992-01-01), McGady
patent: 5605019 (1997-02-01), Maziekien et al.
patent: 5706610 (1998-01-01), Mayle
patent: 5983592 (1999-11-01), Mayle
patent: 6199326 (2001-03-01), Mayle
patent: 3603303-A1 (1987-
Anderson Chad C.
Dorsey Dennis L.
Friedman Carl D.
Shannon John P.
Venable
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