Roof Ventilation Design

The choice of venting or not venting is a design and construction choice not a requirement determined by the physics or by the building code.

Roof ventilation design.

The term refers to a system which allows air to flow through the intake and exhaust. Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The early to mid 20th century saw the development of this concept.

What exactly does that mean. An important part of a healthy home and a complete roofing system is roof vents. The building codes and building science for natural roof ventilation however only appeared in the 1940s. Enter square footage calculate or enter the square footage of the attic or area to be vented.

Roof ventilation is not a new process by any means. Roof ventilation helps to keep the attic dry and cool but it s also important to maintaining a healthy environment. Normal household activities such as doing laundry running the dishwasher and taking showers generate warm moist air which rises from the living space and into the attic. Advantages of proper roofing ventilation.

Attics or roofs can be designed and constructed to be either vented or unvented in any hygro thermal zone map 1. Ventilation is important for all parts of your house and the roof is no exception. The installation of roof vents is a crucial part of roof design because it allows for proper attic ventilation which may help prevent condensation and early aging of your roofing materials. As a homeowner it is important that you review the soffit areas of the home for soffit vents.

Intake vents located at the lowest part of the roof under the eaves allow cool. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. In short an adequate and balanced ventilation system is one that allows an equal amount of air to enter and exit the attic area. Roof system ventilation is required by the model building codes such as international residential code irc which includes irc r806 roof ventilation that requires ventilation for attics and cathedral ceilings and icc r905 1 requirements for roof coverings that requires builders to follow the manufacturer s installation instruction.

The model building codes allow both vented and unvented roof assemblies.