Venting A Roof Valley

This application ensures air flow through the valley from the soffit to the ridge for required air exchange. Beyond the decreased capacity for insulation when venting the roof deck venting the roof deck or the attic has some other drawbacks worth considering. 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.

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Wash the underside of the roof deck with air.

Venting a roof valley.

In cold climates snow can enter the soffit and ridge vents melt and potentially cause rot. 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. If you re actually going to vent the roof let s be serious about venting the roof. That means the entire perimeter of the roof needs to have air inlets meaning continuous soffit ventilation.

2 if you re going to vent the roof then vent the roof. Ice dams form when a home s escaping heat warms the roof sheathing and melts the underside of the snow layer on the roof. Applying the smooth side down nail in place install one vent per rafter in all valley areas and apply roof sheathing plywood over the valleyvents and nail. The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck.

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