Cold Deck Flat Roof Ventilation

A ventilation gap usually 50mm should be.

Cold deck flat roof ventilation. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1 10. When thermal insulation is placed below the deck the ventilation must also be on the underside. Hot roofs have the roof deck then insulation then the roofing material. It depends on where the insulation is installed.

Hot roofs need to be ventilated and cold roofs don t but why. Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings. Cold roofs have insulation beneath the roof deck which is beneath the roofing material. 2011 code of practice for control of condensation in buildings stipulates that there should be a ventilation gap between the insulation and the bottom of the flat roof deck of at least 50mm.

Ventilation for cold roofs.