Flat Roof Vent Spacing

Flat roof ventilation is achieved by creating air changes to the attic or plenum.

Flat roof vent spacing.

Drive nails up through the sheathing and shingles to mark roof air vent locations. Set your store to see local availability add to cart. 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. For the previous example you would need 20 soffit vents.

Center nails between rafters 18 in. Commercially available stack vents are generally 2. 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. Nfa roof vent in mill finish model rbv 8.

Active ventilation 4 in. 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. Active ventilation 13 in. Free delivery with 45 order.

Klober circular soffit vents provide eaves ventilation through the soffit and are a particularly easy option to install. Ventilation must also be provided through the eaves or roof ridges using fascia vents or the skylight upstand on the roof. Mark attic roof air vent locations. Venting of flat roofs.

A roof vent installation kit will provide everything you need to vent your roof in one convenient package. Roof vents will provide about half of the vent area and soffit vents the other half. Ventilation is crucial to these areas as they affect the building as a whole both inside and out. Next divide the square footage of vent space required by the square footage of soffit vent you have selected.

Dia aluminum keepa static vent for flat roofs in white model kv 4 wt 34 24 34 24. Klober flat roof vents. 27 lineal feet required. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

They also come in four colour options. When determining the placement of the roof vents measure the vent housing and mark off the space on the roof. 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. Ventsure 4 foot strip heat moisture ridge vent.

Optimum roof ventilation design. Dia low profile 50 sq. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches. How to install roof vents.

Originally published may 1976.