Non Vented Roof Systems

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.

Non vented roof systems.

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. The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available. In this case you can learn a lot from foam tech s article vented vs. The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies.

The roof assembly has enough insulation and it is properly installed. Sc historically typical construction of homes in canada and the us have vented attics between the ceiling of the interior space and the roof. I have roof vents so i have roof ventilation. Icynene s open cell structure easily allows any moisture or water vapor intrusion to quickly drain and dry out.

Unvented roof systems can be safely used in many different climates. An unvented roof assembly is constructed without any ventilation and is fully sealed on all sides and filled with insulation. While hardly anybody agrees on the best roof ventilation system everybody agrees some roof vents do hardly any good at all. A vented roof system can only work properly and remove the moisture from a roof assembly if.

The building envelope is tight enough to prevent warm moist air from escaping from the building interior into the roof assembly. Take for example ridge vents. The truth about insulation performance in the real world of buildings. 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.

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 such as conditioned attics and unvented cathedral ceilings are becoming common in north american construction. Unvented roofs which provides a detailed explanation of each.