Flat Roof Non Venting Methods

The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck.

Flat roof non venting methods.

In this case you can learn a lot from foam tech s article vented vs. In order for an un vented roof assembly to function properly the following conditions must be in place. Specialized roof coatings are available in a wide range of materials and can help a flat roof reflect up to 90 percent of solar heat. Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing.

Consequently the article concludes that the concept of venting a flat roof is no longer safe and instead don t vent the flat roof and install a smart vapor retarder inboard. On a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through rising thermal pressure lower down in the building. In a cold climate the primary purpose of ventilation is to maintain a cold roof temperature to avoid ice dams created by melting snow and to vent any moisture that moves from the conditioned. Unvented roofs which provides a detailed explanation of each.

The range of materials includes an elastomeric paint large polyvinyl chloride pvc sheets with heat sealed seams an asbestos film shield or even a thin layer of solar panels that will collect solar energy. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below to create an effective barrier.