Flat Roof Ventilation Archives - Construction Canada

Flat Roof Ventilation: A Need for a Better Understanding

(05/13/2024)

In Canada, the requirement for the 1/300 vent ratio first appeared in the 1953 National Building Code (NBC) and it did not make any distinction between structures with flat and sloped roofs.

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Flat Roof Ventilation: A Need for a Better Understanding

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Flat Roof Ventilation: A Need for a Better Understanding

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