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Section 9.27 of the National Building Code of Canada requires exterior walls to have a first and second plane of protection. The second plane must intercept all moisture that gets past the first plane. This second plane must include flashing to dissipate water to the exterior, and must be maintained at windows, doors, and other wall penetrations.

The J-channel collects and distributes water to the window jambs (sides), behind the first plane of protection (cladding), and downwards to the sill (bottom). These areas are failure prone, and are often installed incorrectly. Have you ever seen red seam tape around windows? That's wrong.

Flashing is required at every horizontal intersection. Acceptable flashing must be of (1) a suitable material and (2) thickness; (3) extend upwards not less than 50 mm, (4) have a slope of not less than 6%, (5) terminate with end-dams, (6) lap not less than 10 mm, and (7) terminate with a drop offset. J-channel does not meet conditions 5 of 7 requirements. (Please see code for complete requirements.)
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RJ Miller Building Professionals
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Domingo 30 Agosto 2015
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