One Way Vent For Flat Roof

Two way air vent get in touch.

One way vent for flat roof.

Originally published may 1976. And while we can back vent a flat roof is it the most effective and safest approach. Another concern with flat roofs is how well they dry out if a leak or severe condensation problem does occur. In order to avoid a steam bubble with mois ture trapped inside breather vents are used.

At pitched roofs with the insulation between joists we know a back vented roof is a great way to keep the roof functioning well as stated in a prior 475 blogpost. In winter the wood in a roof structure will store a great deal of. But what s true for a pitched roof is not necessarily true for a flat roof. But full ventilation discussed above will provide some roof drying.

One and two way vents have been shown to be of little use in drying out a wet roof or roof cavity. Trapped air pressure and moisture can cause a reduction in thermal protection of the insulation and roof membrane system leading to roof deck damage. Ventilated flat roof ventilated flat roofs two part cold roofs provide a functional roof. The portals plus vents have a one way valve designed in the unit to prevent moisture from re entering the roof system.

Venting of flat roofs. Today the majority of flat roof con structions are carried out as unven tilated flat roof without a ventilation level for thermal insulation. The one way vent allows trapped air pressure to escape while the two way breather combined with the one way vent will help reduce moisture. Venting in building construction as a technique of cooling by air flow and of controlling or removing moisture has been in use for many years.

The portals plus breathers allow for both exhaustand convective movement of air between breathers.