Cold Deck Flat Roof Ventilation

There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation.

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. Cold roofs have insulation beneath the roof deck which is beneath the roofing material. It depends on where the insulation is installed. Hot roofs need to be ventilated and cold roofs don t but why.

Cold deck flat roof the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. Ventilation for cold roofs. When thermal insulation is placed below the deck the ventilation must also be on the underside. A ventilation gap usually 50mm should be.

In a concrete deck for example this gap could be created by fixing 50x50mm timber battens at 600mm centres and attaching the insulation to underside of these battens.