How To Ventilate A Cold Flat Roof

If you are talking about a flat roof my answer to you is the same as the answer i gave h.

How to ventilate a cold flat roof.

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. 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. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below.

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. On the unventilated side there is no overhang just a solid facia board flush with the wall. Why don t cold roofs need to be ventilated. A cold roof really is colder than the rest of your home in the winter which means condensation is much less likely to develop.

That means the rest of the roof is protected from heat. I have a cold flat roof ventilated by soffit vents on one side and no ventilation on the other side. Ventilating a flat roof on a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through. The glidevale technical team has co.

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.