Width-selectable pipe flashing piece and method of use

A method of installing a pipe during the construction of a structure having walls, including a primary weather barrier, a secondary weather barrier and framing, at the point where the framing has been at least partially completed, through a hole in a said wall, so as to not permit water to enter said structure past said secondary weather barrier, including through said hole in said wall about said pipe, comprising:

• a) providing a flashing piece, comprising:
• i. an outer portion, defining an opening and made of a first polymeric material;
• and
• ii. an inner portion, joined to said outer portion about said opening and extending across and covering said opening;
• and
• iii. wherein said inner portion is made of a second polymeric material that is more flexible and elastic than said first polymeric material and is in most places of a first thickness and further defines indented rings wherein said second polymeric material is thinner than said first thickness;
• b) partially installing said pipe, so that it has a free end extending through said framing;
• c) broaching one of said indented rings to create a tear along said indented ring, and then propagating said tear about said indented ring, until said tear extends all the way around said indented ring and removing the resultant disk of second polymeric material inside said indented ring, thereby creating a through-hole;
• d) placing said through-hole about said pipe and attaching said outer portion to said framing;
• and
• e) constructing the primary weather barrier, about said pipe;
• and
• f) wherein said inner portion further includes a thin spot, and wherein said method includes broaching said thin spot and passing a grounding wire through it.