Most codes require crawlspace ventilation to reduce moisture- related decay. And all require that roofs be ventilated to prevent moisture from accumulating in the insulation and to ward off ice dams. In some situations, however, such as on a steep roof or a low foundation wall, providing adequate ventilation is difficult. Here are two innovative approaches to ventilating these problem areas. Do you have a building detail—rough or finish, interior or exterior—that works well for you and might be a help to others? If so, please send us a readable drawing along with a brief written description of the technique. Send your ideas, along with name, address, and phone number, to JLC Details, RR#2 Box 146, Richmond, VT 05477. Building Details Wanted Steep roof ventilation. A standard rule of thumb for roof ventilation calls for one
Detail: Ventilation Innovations
"Most codes require crawlspace ventilation to reduce moisture-related decay. And all require that roofs be ventilated to prevent moisture from accumulating in the insulation and to ward off ice dams. In some situations, however, such as on a steep roof or a low foundation wall, providing adequate ventilation is difficult. Here are two innovative approaches to ventilating these problem areas."
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