Venting Flat Roof With Parapet Walls

Venting in wood framed parapets.

Venting flat roof with parapet walls.

Treat these short parapet walls as part of the conditioned attic and cover. The assembly is straight forward but what complicates matters is that the roof needs to be vented. For areas which do not need above cover. 2 create a path by wich natural convection would be made by the connection of the shed roof with the flat roof via the vertical wall 3 close the fascia vents off the flat roof only has fiberglass batts with an r22 value so one day in the future the roof will need to be replaced and rigid foam can be placed on top but that will have to wait.

Max baker and stonewall jackson would be proud. Treat these short parapet walls as part of the conditioned attic and cover. I have short 12 parapet walls surrounding a flat roof house in zone 2a. The perimeter of the roof assembly insulation is wrapped to prevent interstitial airflow from the parapet into the multilayered rigid insulation of the field of the roof.

Like any roof with batt insulation the venting is an important part of the system. The parapet itself is standard wood framing with an applied siding in this case t g 1 4 cedar. Can use round louvered soffit vents to limit bulk water intrusion if venting holes are in exposed location. Provide venting to each wall cavity.

If cavity is greater than 12 provide high low venting in each wall cavity. I ve had several followers of this channel ask me how to create a flat style roof with parapet walls so i thought it was about time to show how to sketch th. Normally you would find the venting at the soffit the underside. I have short 12 parapet walls surrounding a flat roof house in zone 2a.

What is the best way of addressing the ventilation and weather barrier here. The parapet walls are connected to the attic i guess this would be termed ballon framed which is conditioned.