Flat Roof Vent Spacing

Optimum roof ventilation design.

Flat roof vent spacing.

Klober flat roof vents. Drive nails up through the sheathing and shingles to mark roof air vent locations. Roof vents will provide about half of the vent area and soffit vents the other half. Ventilation must also be provided through the eaves or roof ridges using fascia vents or the skylight upstand on the roof.

27 lineal feet required. A roof vent installation kit will provide everything you need to vent your roof in one convenient package. Otherwise the exiting air at the ridge will usually pull its makeup air from the closer gable end vents and not from the soffit or eaves vents. For the previous example you would need 20 soffit vents.

How to install roof vents. You need to have an equal number of vents located at the bottom of the attic or under the roof easement as you have at the top of the attic near a gable or ridge. Klober circular soffit vents provide eaves ventilation through the soffit and are a particularly easy option to install. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

Active ventilation 13 in. Removal of excess heat and moisture will help the life of the roof and will help the functionality and efficiency of the hvac systems. Nfa roof vent in mill finish model rbv 8. Active ventilation 4 in.

Flat roof ventilation is achieved by creating air changes to the attic or plenum. Dia aluminum keepa static vent for flat roofs in white model kv 4 wt 34 24 34 24. Ventsure 4 foot strip heat moisture ridge vent. Mark attic roof air vent locations.

Originally published may 1976. Center nails between rafters 18 in. When determining the placement of the roof vents measure the vent housing and mark off the space on the roof. Dia low profile 50 sq.

Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. The size and spacing required for stack vents probably relate mainly to lateral moisture transfer potential in the system although the division is not aware of any testing or calculation methods that would indicate what this should be. Set your store to see local availability add to cart. Next divide the square footage of vent space required by the square footage of soffit vent you have selected.

Allow space for the edge of the vent opening where it will rest on the roof. From the roof s peak. Venting of flat roofs. Ventilation is crucial to these areas as they affect the building as a whole both inside and out.

Provides continuous ridge venting continuous soffit venting and then close off those old gable end vents to force the intake air to come where you want it to flow.