Parapet Wall Flat Roof Ventilation

Treat these short parapet walls as part of the conditioned attic and cover.

Parapet wall flat roof ventilation.

Venting in wood framed parapets. The 25mm batten space creates a clear airpath to the roof void below so reducing the possibility of condensation and mould growth. The parapet walls are connected to the attic i guess this would be termed ballon framed which is conditioned. Can use round louvered soffit vents to limit bulk water intrusion if venting holes are in exposed locations.

If cavity is greater than 12 above roof insulation provide high low venting in each wall cavity. What is the best way of addressing the ventilation and weather barrier here. Provide venting to each wall cavity. Parapet detail masonry cavity wall flat roof with parapet insulation.

Where there is a parapet or an external wall abutment to the flat roof the fv250 ventilator can be used above a 150mm timber upstand battened off the wall by 25mm as shown below. Flat roof detail masonry cavity wall flat roof insulation above and between joists. Flat roof detail examples. This video is about making a transition form a flat roof to a parapet wall with taracotta clay caps.

Flat roof detail masonry cavity wall flat roof insulation above and between joists. Diagram below explains the build up.