Back to results
US 5,526,624 AGranted
Method of laying roofing felt and means therefor
AssigneeRoofer International AB
InventorBo Berg
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRoofer International AB
InventorBo Berg
Estimating the term…
Roofing felt containing bitumen which is solid at ambient temperature and soft at an increased temperature is laid on roofs, the roofing felt having pieces with end edges and the method practiced by utilizing a heat emitting member in the form of a metal strip with a number of openings in it for penetration of softened bitumen. The metal strip is provided adjacent a first end edge of a first piece of roofing felt, and the first end edge of the first piece of roofing felt is overlapped with a second end edge of a second piece of roofing felt so that the metal strip engages both of them. A variable magnetic field is applied to the joint area to induce a current of sufficient strength to cause the metal strip to be heated to a temperature sufficient to soften the bitumen of both the pieces of roofing felt so that softened bitumen flows into the openings in the metal strip. After termination of the magnetic field the softened bitumen is cooled so that a tight continuous overlap joint is provided between the felt pieces. Typically while the bitumen is still softened a compression force is applied to the topmost pieces of felt to assist in forcing softened bitumen into and through the openings, such as by rolling a roller over the joint area.
A method of laying roofing felt on roofs, the roofing felt containing bitumen which is solid at ambient temperature and softens at a softening temperature above ambient temperature, and the roofing felt in the form of pieces with end edges, and utilizing a heat emitting member in the form of a metal strip with a plurality of openings for penetration of softened bitumen;
A method as recited in claim 2 comprising the further step (e) of, while the bitumen is still softened as a result of the practice of step (c), applying a compression force to the topmost of the pieces of felt at the joint area to assist in forcing softened bitumen into, and through, the openings in the metal strip, and to thereby assist in forming a tight continuous overlap joint.
A method of laying roofing felt on a roof base surface, the roofing felt containing bitumen which is solid at ambient temperature and softens at a softening temperature above ambient temperature, and the roofing felt in the form of pieces with end edges, and utilizing a heat emitting member in the form of a metal strip with a plurality of openings for penetration of softened bitumen;
A joint between first and second pieces of roofing felt, the first piece having a first end edge, and the second piece having a second end edge, and both pieces of roofing felt containing bitumen which is solid at ambient temperature and softens at a softening temperature above ambient temperature, said joint formed by:
Dependencies are inferred from the claim text.