How To Ventilate A Cold Flat Roof

A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop.

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 do i add ventilation on this side to create through air movement. On the unventilated side there is no overhang just a solid facia board flush with the wall. If you are talking about a flat roof my answer to you is the same as the answer i gave h.

That means the rest of the roof is protected from heat. Your two best options are spray foam insulation on the underside of the roof sheathing an installation which will require the ceiling to be removed at least partially or the installation of rigid foam on top of the existing sheathing. Ventilation for cold roofs. 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.

Why don t cold roofs need to be ventilated. Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below. The glidevale technical team has co.

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.