Unvented Roof Design

Unvented roofs have a number of advantages.

Unvented roof design.

These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. Unvented roof assemblies are becoming an increasingly common construction alternative to traditional vented roofs. Unvented metal roof ted storm posted in energy efficiency and durability on april 27 2011 09 53am in the process of construction currently have a standing seam metal room installed over synthetic felt over osb. Unvented roofs also make a lot of sense in high wind or high fire areas where vents might admit drenching rains or embers.

An unvented superinsulated roof by martin holladay issue 224 deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof. They are designed without ventilation openings and the attic is conditioned like the rest of the living space. An understanding of heat air and moisture as well as the causes of condensation is critical in detailing unvented roof assemblies. Sc historically typical construction of homes in canada and the us have vented attics between the ceiling of the interior space and the roof.

Unvented roofs unvented roofs are increasingly common due to design priorities. Potential pitfalls to avoid include. Un ven ted roof ˌənˈven t əd ro of an unvented roof assembly is constructed without any ventilation and is fully sealed on all sides and filled with insulation. Over the past five years several unvented roof insulation systems have been developed by the building science consortium for use primarily in hot dry and hot humid climate zones.

Unvented roofs operate by the principle that venting is not necessary to control moisture accumulation. Ventilation becomes more difficult the more complicated a roof s construction is. Designs and houses with unvented roof insulation systems have also been developed and constructed in cold and mixed climates. Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction.

The optimum systems developed to date are dependent on the climate location.