Green Building Advisor Venting Flat Roofs

There must be a slope of 1 80.

Green building advisor venting flat roofs.

The room does not have any venting nor is it possible to vent. An air permeable insulation like mineral wool cannot be installed between rafters if the assembly is unvented. So i ll start by saying something that might sound controversial but really isn t. Part h of the building regulations regarding drainage state that water should drain to one or two edges.

A qualified roofing contractor will be able to advise on this but here are some of the main guidelines. 2 if you re going to vent the roof then vent the roof. So much information has been devoted to the subject of roof venting that it s easy to become confused and to lose focus. A vented attic where insulation is placed on an air sealed attic floor is one of the most underappreciated building assemblies that we have in the history of building science.

Wash the underside of the roof deck with air. Originally published may 1976. When installing or repairing a flat roof you must adhere to building regulations. Musings of an energy nerd.

If you re actually going to vent the roof let s be serious about venting the roof. The flat roof overhead is framed in full depth 2x6s finished with what jordan believes is roll roofing a type of asphalt roofing. He says ruling out a layer of exterior rigid foam. Venting in building construction as a technique of cooling by air flow and of controlling or removing moisture has been in use for many years.