Patent ID: 8313597

Claim:
A method of welding a thermoplastic profile strip to a thermoplastic membrane, the method comprising: a) placing a thermoplastic profile strip on a thermoplastic membrane, the profile strip having a horizontal base extending longitudinally, and a first longitudinal edge and a second longitudinal edge opposite the first edge, wherein the thermoplastic membrane is in close proximity to the first and second longitudinal edges; b) placing a first thermoplastic welding rod along a portion of the first longitudinal edge, and placing a second thermoplastic welding rod along a portion of the second longitudinal edge; c) simultaneously directing hot air along the portion of the first longitudinal edge and along the portion of the second longitudinal edge, the directing simultaneous with the placing of the first and second thermoplastic welding rods, wherein the hot air sufficiently softens the portions of the first and second edges and the first and second welding rods such that gravity brings the softened portions of the first and second edges and softened portions of the first and second welding rods into contact with the membrane thereby heat-welding the portions of the first and second edges and the portions of the first and second welding rods to the membrane; and d) advancing the hot air along the remaining length of the first and second edges and additional portions of the first and second welding rods until the entire length of the first and second edges are welded to the membrane.