Risks of roof ventilation


Incorrectly designed, constructed and maintained ventilated roofs may fail prematurely by moisture-induced rotting, whereas non-ventilated roof systems with a breathable membrane require no maintenance and will function correctly indefinitely. Traditional felted roofs will become wet if under-ventilated and moisture cannot escape, or, if excess moist air enters due to over-ventilation. Ventilated systems are not fail-safe, and the necessary air movement can also lead to energy loss. Non-ventilated systems exhibit low energy losses, and low moisture levels are maintained by the use of breathable membranes.

Source: Roofing

             December 2003, p.16-18




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