More Picture Of How To Ventilate A Warm Flat Roof HD Image Size. Diagram below explains the build-up. 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.
Ventilation is required for these roofs. If 3 inches is the minimum thickness then the R-value of your planned roof assembly is. If you have a hot roof this warm air changes the temperature of your roof decking as it doesnt have ventilation to relieve the heat.
If you have a hot roof this warm air changes the temperature of your roof decking as it doesnt have ventilation to relieve the heat.
Nov 19 2019 Roof is flat fibreglass so no over fascia vents like you would do with pitched roof. May 24 2019 This helps to reduce moisture levels and avoid other problems such as mould and rot. 25mm at eaves on each slope and 5mm at ridge. A cold deck roof is where the insulation is placed between the joistsrafters or in between the ceiling joists in the case of a pitch roof.