Roof Design Ventilation

As a homeowner it is important that you review the soffit areas of the home for soffit vents.

Roof design ventilation.

The model building codes allow both vented and unvented roof assemblies. The building codes and building science for natural roof ventilation however only appeared in the 1940s. 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. 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.

Roofs can be designed and constructed to be either vented or unvented in any hygro thermal zone. Roof ventilation helps to keep the attic dry and cool but it s also important to maintaining a healthy environment. 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. An important part of installing any system of ventilation into your roof system is to make sure that there is a point of entry and a point of exit for airflow.

In cold climates the primary purpose of attic ventilation is to maintain a cold roof temperature to avoid ice dams created by melting snow and to vent moisture that moves from the conditioned space to the attic. Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. In short an adequate and balanced ventilation system is one that allows an equal amount of air to enter and exit the attic area. Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.

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. What exactly does that mean. Intake vents located at the lowest part of the roof under.

An important part of a healthy home and a complete roofing system is roof vents. 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. For all roof designs however the most important feature of a roof ventilation system is adequate and balanced airflow.