Venting Flat Roof Space

Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

Venting flat roof space.

Any type of roof from tpo to epdm can be either hot or cold. Originally published may 1976. This is easy to accomplish in simply. Ventsure 4 foot strip heat moisture ridge vent.

If the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. Vent the roof deck. The article notes that the ventilation cannot overcome the significant humidity drive into the flat roof structure caused by small air leaks.

On flat roofs with soffit vents the only mechanism that might drive air thorough the vented space would be occasional wind conditions that happen to blow air against one side of the building and up through the soffit vents across the roof to outlet on the opposite side a rather speculative roof venting system you ll probably agree. The answer depends on the type of roof you have. Vent the roof deck. In ireland the most common types are pitched lean to and flat roof construction.

To understand ventilation in roofs we must first recognise that there are many different roofs types. If the attic space is going to be conditioned either for living or mechanical purposes or if a home design calls for a vaulted ceiling provision r806 3 in the international residential code calls for the roof deck above the space to be vented continuously from the eave to the ridge. It is the principal concern of this digest for it is often plagued by moisture problems. A cold roof or hot roof.

The typical flat or near flat roof with no intentional air space is used mainly for commercial and industrial buildings. It s unavoidable that the thermal temperature in the roof space will bear the brunt of the heat generated in the living spaces below. Consequently the article concludes that the concept of venting a flat roof is no longer safe and instead don t vent the flat roof and install a smart vapor retarder inboard. Venting of flat roofs.

27 lineal feet required. It depends on where the insulation is installed. Choosing the correct ventilation solution for a flat roof will play an integral role in extending a structure s lifespan. From the inside outward it consists of a structural roof deck in most cases.

Each of these roof types poses different challenges for ventilating a roof space.