Venting A Flat Roof With Parapets

Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof.

Venting a flat roof with parapets.

Alternatively you can drill lots of holes to connect the joist spaces or use web trusses and then install vents in the flat roof surface as in commercial. If cavity is greater than 12 provide high low venting in each wall cavity. Provide venting to each wall cavity. Nothing built yet but in theory the solution should work well.

These can be ridge vents wind turbines or the flat vents your roofer wants to install. Venting in wood framed parapets. For areas which do not need above cover. There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation.

Instead the air is vented through the roof to the parapet walls the parapet then incorporates a continuous strip vent beneath the cap flashing. When thermal insulation is placed below the deck the ventilation must also be on the underside. Attic must have 5 sq. That way you can use the parapet wall to detail a vent in the back side of it.

Good attic ventilation is important for preventing ice dams in the winter. Can use round louvered soffit vents to limit bulk water intrusion if venting holes are in exposed location. Normally you would find the venting at the soffit the underside of the roof overhang but that s not possible with the parapet.