Patent ID: 11927053
Assignee: PN II, INC.
Field: Civil engineering (Other fields)
Classification: CPC E  B | IPC B  E

Claim 10:
11. A method of making and installing a window sill flashing, comprising:
a) forming a first one-piece sill flashing that is a continuous shaped structure without seams which includes:
(i) a base having a substantially rectangular shape and a front edge and at least one side edge;
(ii) a front flange projecting perpendicularly downward from the front edge of the base;
(iii) at least one side flange having a side surface and a front surface, wherein the side surface extends vertically from the at least one side edge of the base and the front surface is coplanar and continuous with the front flange and extends perpendicularly from the side surface;

b) forming a second one-piece sill flashing that is a continuous shaped structure without seams which includes:
(i) a base having a substantially rectangular shape and a front edge and at least one side edge;
(ii) a front flange projecting perpendicularly downward from the front edge of the base;
(iii) at least one side flange having a side surface and a front surface, wherein the side surface extends vertically from the at least one side edge of the base and the front surface is coplanar and continuous with the front flange and extends perpendicularly from the side surface; and

c) applying a housewrap to a window opening such that the housewrap covers a bottom portion of the window opening and a portion of an exterior wall in which the window opening is located;
d) installing the first one-piece sill flashing and the second one-piece sill flashing such that they are located on the bottom portion of the window opening having the housewrap thereon;
wherein the first one-piece sill flashing and the second one-piece sill flashing partially overlap and are in direct contact with one another to produce the window sill flashing having a length generally equal to a width of the window opening;
wherein the base of both the first one-piece sill flashing and the second one-piece sill flashing is in direct contact with the bottom portion of the window opening having the housewrap thereon;
wherein both the first one-piece sill flashing and the second one-piece sill flashing are free of any metallic flanges and free of any metallic coverings applied to a lower surface of the base or an upper surface of the base opposite the lower surface;
wherein the forming of the first one-piece still flashing and the second one-piece sill flashing is a vacuum-forming of a thermoforming film; and
wherein the first one-piece sill flashing and the second one-piece sill flashing each have a thickness in the range of about 7.5 mils to 35 mils.