As a roof ’s pitch becomes steeper, the effective opening of the slot becomes smaller. To provide effective ventilation, the slot cut must be wider than normal. The following chart gives the necessary measurements for higher than 12/12 pitches. PITCH EACH SIDE TOTAL 13/12 2 5/8" 5 1/4" 14/12 2 3/4" 5 1/2" 15/12 2 7/8" 5 3/4" 16/12 3" 6" 17/12 3 1/8" 6 1/4" 18/12 3 1/4" 6 1/2"
		Under no circumstances should Roll Vent be installed on pitches over 18/12. This steep ridge application is for ridge installations only. The presence of a ridge beam may slightly reduce ventilation effectiveness.

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