Venting A Flat Roof With Parapets

Nothing built yet but in theory the solution should work well.

Venting a flat roof with parapets.

Venting in wood framed parapets. We also have a parapet on a flat roof and the ventilation solution is not through the cladding but the design flows air over the parapet. That way you can use the parapet wall to detail a vent in the back side of it. Can use round louvered soffit vents to limit bulk water intrusion if venting holes are in exposed location.

Instead the air is vented through the roof to the parapet walls the parapet then incorporates a continuous strip vent beneath the cap flashing. Provide venting to each wall cavity. Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings. The solution seems reasonable but we are definitely going to end up with a cold roof though not in the traditional sense.

Normally you would find the venting at the soffit the underside of the roof overhang but that s not possible with the parapet. Attic must have 5 sq. When thermal insulation is placed below the deck the ventilation must also be on the underside. For areas which do not need above cover.

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. These can be ridge vents wind turbines or the flat vents your roofer wants to install. Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof.