Roof Valley Ventilation

Roof ventilation details at skylights to provide an air path eaves to ridge localized hot spots such as skylights can also lead to ice dams below due to blocked ventilation as well as melt water from skylight heat loss.

Roof valley ventilation.

Air flows in through the soffit vents and out through the roof vents. Vents come in various styles. The valleyvent provides adequate ventilation in the spaces to either side of the vent placement. Valleyvent is an under plywood top of rafter vent easily installed during the construction of an addition or a new home.

Optimum roof ventilation design. The valley area of a roof the straight lines formed when two different planes of the roof meet is a critical area that handles a tremendous amount of water run off. Allow space for the edge of the vent opening where it will rest on the roof. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves.

If you see dampness or frost you need better roof ventilation and some attic vents. Beyond the decreased capacity for insulation when venting the roof deck venting the roof deck or the attic has some other drawbacks worth considering. It is a required vent product when your soffit to ridge air flow is blocked by a skylight or dormer. To be sure your roof is getting enough ventilation there are simple calculations that you can follow.

Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer. Notching the rafters on either side of the skylight will help maintain airflow above the skylight figure 2 59 at left. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet. 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.

Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. Install roof ventilation a roof vent installation kit will provide everything you need to vent your roof in one convenient package. In cold climates snow can enter the soffit and ridge vents melt and potentially cause rot. 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.