A roof cricket must be engineered to match or exceed the exact width of the chimney, skylight, or vertical wall obstruction it is protecting, typically spanning the full horizontal dimension of the uphill face. Building codes generally require a cricket whenever an obstruction exceeds thirty inches in width. Making the cricket wide enough ensures that all rainwater and melting snow flowing down the roof slope hits the central ridge of the saddle and is successfully diverted outward around both sides of the barrier.
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