Non Vented Roof Systems

Sc historically typical construction of homes in canada and the us have vented attics between the ceiling of the interior space and the roof.

Non vented roof systems. These assemblies are created by eliminating ventilation openings and moving the thermal moisture and air control boundaries to the plane of the roof deck. The truth about insulation performance in the real world of buildings. However designers of compact roof assemblies must consider vapor permeance and arrangement of the roofing materials to produce acceptable hygrothermal performance and low. 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.

Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available. Take for example ridge vents. The roof assembly has enough insulation and it is properly installed.

The building envelope is tight enough to prevent warm moist air from escaping from the building interior into the roof assembly. Unvented roofs which provides a detailed explanation of each. A vented roof system can only work properly and remove the moisture from a roof assembly if. In this case you can learn a lot from foam tech s article vented vs.

Unvented roof assemblies such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. In cold climates insulating sheathing must be added exterior to the roof sheathing to prevent condensation on the underside of the roof sheathing. With any roof system there should always be a contingency plan to address the possibility of roof leaks especially with wood roof decks. Icynene s open cell structure easily allows any moisture or water vapor intrusion to quickly drain and dry out.

I have roof vents so i have roof ventilation. Unvented roof systems where the insulation and air barrier are applied directly to the underside of the roof deck are common in applications where designers are seeking cost effective and energy efficient roof assemblies. An unvented roof assembly is constructed without any ventilation and is fully sealed on all sides and filled with insulation.