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Leadfree roof flashing material
| Details |
Inventors: Larsen, Niels A.;
Assignee: V. Kann Rasmussen Industri A/S (Soborg, DK)
Primary Examiner: Safavi; Michael
Assistant Examiner:
Attorney, Agent or Firm: Lane, Aitken & McCann
A lead-free plate-shaped roof flashing material comprises a sandwich structure in which a stress damping and stabilizing layer of ductile material is completely covered on one side and at least partly covered on the other side by preferably metallic foil sheetings, e.g. of aluminum foil, designed with densely positioned flattened folded sections having such a form, e.g. closed inverted pleats, that a material layer of each folded section gets into contact with the stress damping and stabilizing layer only when the folded sections open in connection with deforming the flashing material to make it fit to the roofing. |
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DETAILED DESCRIPTION I claim: 1.
A lead-free roof flashing material for providing a weathertight joint between an inclined roof surface and a building structure arranged therein, such as a main frame portion of a skylight, comprising a manually deformable sandwich structure including a stress damping and stabilizing core layer of a ductile material, a first foil sheeting completely covering one side of said core layer and a second foil sheeting at least partly covering the opposite side of said core layer, each of said foil sheetings having a thickness substantially less than said core layer and being shaped into flat-folded sections each comprising at least one inner layer in contact with said core layer, at least one intermediate layer extending substantially parallel with and close to said inner layer and joining said inner layer in a first folding line and an outer layer extending substantially parallel with and close to said intermediate layer and joining said intermediate layer in a second folding line parallel to said first folding line, a pair of said first folding lines extending at such a small distance from one another as to prevent said outer layer from contacting said core layer in a non-deformed state of said sandwich structure, but permit said outer layer to be contacted by said core layer upon an increase of said distance caused by manual deformation of said sandwich structure.
2.
A roof flashing material as claimed in claim 1, wherein each of said flat-foled section is formed as an inverted pleat section with two inner layers and two intermediate layers joining said inner layers in a pair of said first folding lines and said outer layers in a pair of said second folding lines.
3.
A roof flashing material as claimed in claim 1, wherein said core layer is of a material which is stretchable and adhesive at least in a temperature range from -5.
degree.
C.
to 60.
degree.
C.
4.
A roof flashing material as claimed in claim 3, wherein said core layer comprises an isobutyleneisoprene rubber as a main constituent
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