The Ontario Building Code | Flashing for Weep Holes in Masonry Veneer/Masonry Walls
9.20.13.5. Flashing for Weep Holes in masonry Veneer/masonry Walls
(1) Flashing beneath weep holes in cavity walls and masonry veneer/masonry back-up walls shall,
(a) be bedded not less than 25 mm in the inside wythe,
(b) extend to not less than 5 mm beyond the outer face of the building element below the flashing, and
(c) be installed with a nominally horizontal slope toward the outside wythe.
In Plain Language
Flashing for weep holes in masonry veneer or masonry walls must meet the specific requirements set out in this article, working together with weep holes to drain moisture from the wall cavity.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.