Flat Roof Vent Spacing

Originally published may 1976.

Flat roof vent spacing.

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

Roof vents will provide about half of the vent area and soffit vents the other half. Dia low profile 50 sq. Optimum roof ventilation design. Klober circular soffit vents provide eaves ventilation through the soffit and are a particularly easy option to install.

Removal of excess heat and moisture will help the life of the roof and will help the functionality and efficiency of the hvac systems. Klober flat roof vents. Set your store to see local availability add to cart. Nfa roof vent in mill finish model rbv 8.

Drive nails up through the sheathing and shingles to mark roof air vent locations. Allow space for the edge of the vent opening where it will rest on the roof. 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. Free delivery with 45 order.

27 lineal feet required. 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. For the previous example you would need 20 soffit vents. Active ventilation 13 in.

Dia aluminum keepa static vent for flat roofs in white model kv 4 wt 34 24 34 24. How to install roof vents. Venting of flat roofs. When determining the placement of the roof vents measure the vent housing and mark off the space on the roof.

They also come in four colour options. From the roof s peak. Mark attic roof air vent locations. Choose one of the following products to meet the recommended exhaust nfva of 528 square inches.

Center nails between rafters 18 in. Active ventilation 4 in. Ventilation must also be provided through the eaves or roof ridges using fascia vents or the skylight upstand on the roof. Ventsure 4 foot strip heat moisture ridge vent with weather protector moisture barrier.

Commercially available stack vents are generally 2.