Cold Deck Flat Roof Ventilation

Flat roof ventilation allows for the circulation of air in the property particularly for warmer rooms in residential buildings.

Cold deck flat roof ventilation.

When thermal insulation is placed below the deck the ventilation must also be on the underside. A ventilation gap usually 50mm should be. Ventilation for cold roofs. Hot roofs have the roof deck then insulation then the roofing material.

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. Hot roofs need to be ventilated and cold roofs don t but why. There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation. Cold roofs have insulation beneath the roof deck which is beneath the roofing material.

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.