How To Ventilate A Cold Flat Roof

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.

How to ventilate a cold flat roof.

For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below. If you are talking about a flat roof my answer to you is the same as the answer i gave h. Ventilation for cold roofs. That means the rest of the roof is protected from heat.

A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop. I have a cold flat roof ventilated by soffit vents on one side and no ventilation on the other side. Their layer of insulation is beneath the roof decking and the roofing membranes. Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through.

How do i add ventilation on this side to create through air movement. 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. On the unventilated side there is no overhang just a solid facia board flush with the wall. 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.

The requirements for a cold flat roof is to provide the equivalent of 25 000mm m of ventilation on two opposing sides of the roof in accordance with british standards bs5250 2011 control of condensation in buildings.