Static structures (e.g. – buildings) – Exterior-type flashing
Patent
1998-04-01
1999-06-22
Friedman, Carl D.
Static structures (e.g., buildings)
Exterior-type flashing
52 60, E04D 1302, E04D 1314
Patent
active
059137797
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sheet metal flashing member for frame structures of roof windows or similar roof penetrating building structures with main frame side surfaces substantially perpendicular to the surrounding parts of the roof surface, comprising a shaped corner piece made in one piece of folded sheet material and comprising a first pair of wall sections for covering end parts of main frame side members perpendicular to one another and a second pair of wall sections for covering the parts of the roof surface which border on said main frame side members.
When flashing frame structures for roof windows to protect them from the weather it is common to use flashing covers of sheet metal, for instance aluminium, copper, steel or zinc. Conventionally, such flashing covers have been manufactured by ordinary tinman work from a plane sheet material which is profiled for the formation of two flanges for mounting against the outer side of a main frame member perpendicular to the roof surface and against the bordering part of the roof surface, respectively.
The comparatively costly adjustment and assembly work on location, which is required when using this conventional craftmanship, may be avoided by use of pre-manufactured flashing members which are normally carried out in such a way that four flashing members for covering the four sides of the frame structure are assembled by means of custom-made shaped corner pieces.
DK Patent No. 143.297 discloses a shaped corner piece with a pair of wall sections for flashing end parts of mutually perpendicular sides of the frame structure and a ledge portion running around the corner in question in form of sheet pieces bent from the planes of the wall sections. By folding the parts of the basic sheet material which do not form part of the wall sections or the ledge portion, this known shaped corner piece may be manufactured without cracks or incisions in the sheet material, which means a reduced risk of leakage, just as labour is saved due to the elimination of a part of the cutting and welding work which has been used in the conventional manual production.
As this known shaped corner piece only covers end parts of the mutually perpendicular side members of the main frame structure itself, the flashing of the part of the roof surface positioned opposite the corner has, however, still to be carried out by means of adequately cut parts of the profile frame pieces, with which the shaped corner piece is connected, which means that a certain cutting and assembly work is still required on location with a subsequent risk of leakage, for instance as a consequence of badly made soldering.
DK-patent specification No. 98982 discloses a corner piece consisting of bitumen plate material. The bitumen plate is provided with one or more slits and is subsequently folded into shape for covering the corner of a roof penetrating structure, following which the corner piece is melted together with the surrounding roofing felt.
For use in connection with the same or other types of building structures other embodiments of prefabricated shaped corner pieces in form of flexible plastic film pieces are known from U.S. Pat. No. 4,700,512, or cast, possibly flexible plastic components, U.S. Pat. No. 4,635,409 and DE published specification No. 36 03 303.
U.S. Pat. No. 3,247,632 discloses a flashing for roof windows, said flashing comprising a collar with wall sections for covering the end parts of the mutually perpendicular sides of the main frame structure and of the parts of the roof surface adjacent to these sides. Thus, no care has been taken according to this publication in respect of covering the part of the roof surface opposite the very corner.
On this background the object of the invention is to provide a flashing member comprising a shaped corner piece made by folding of a one-piece sheet billet, said corner piece not only comprising flashing wall sections for the mutually perpendicular sides of the main frame structure, but also wall components for covering the adjacent parts of t
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Callo Laura A.
Friedman Carl D.
V. Kann Rasmussen Industri A/S
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