BCAB #1636 - Window Sill Flashing, Sentence 188.8.131.52. (5)
July 18, 2007
Re: Window Sill Flashing, Sentence 184.108.40.206. (5)
The subject is the installation of a flange type vinyl frame window. Around the exterior perimeter of the window is wood trim about 18 mm thick. At the base of the window is a sloping (12 degree) sill trim which extends about 75 mm beyond the cladding. Flashing has been provided between the base of the window and the wood framing below and extends downward below the exterior window trim on the exterior sheathing.
Reason for Appeal
Sentence 220.127.116.11.(5) indicates where the sill of a window is not self-flashing, flashing shall be installed beneath the underside of the window and the wall construction below.
The appellant considers the installation complies with the flashing requirements of Sentence 18.104.22.168.(5).
Building Official's Position
The Building Official does not consider the window to be self flashing and therefore the requirements of 22.214.171.124.(5) are applicable. This would include additional flashing behind the base window trim and trim sill, commencing at the top of the sill trim and carrying around between the base trim the cladding.
Appeal Board Decision #1636
It is the determination of the Board that the additional flashing behind the base window trim and over the trim sill is not a requirement of the Building Code.
George Humphrey, Chair