Warm Roof Venting

If ridge or eaves ventilation is not possible ventilation tiles can be used at high or low level to achieve the required airflow.

Warm roof venting.

In a hot climate roof vents expel hot air from the roof or attic while relieving the load on the air conditioning system. Vented roofs let out the heat from inside your house which gives a cooling effect. These roofs keep your home cooler during the hot summer months. Proper ventilation helps keep the roof from getting too warm by removing warm air that rises from the conditioned living space below.

Roof ventilation in a cold climate vents moisture and ensures a cold roof temperature to avoid ice dams. Hot air exhaust vents located at the peak of the roof allow hot air to escape. 25mm at eaves on each slope and 5mm at ridge. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Theory behind venting ice dams form when a home s escaping heat warms the roof sheathing and melts the underside of the snow layer on the roof. Because the sheathing is kept cooler roofing materials tend to have a longer life span. The intent of roof venting varies depending on climate but it is the same if you re venting the entire attic or if you re venting only the roof deck. If this warm air is not removed it warms the roof which can begin melting the snow and start the subsequent thaw freeze cycle.

Warm roof ventilation specification. The most popular way to ventilate an attic is to take advantage of buoyancy or warm moist air s natural tendency to rise especially when pushed by cold air beneath it. As a result you will. The two roof ventilation options intake vents and exhaust vents should be placed to take advantage of the natural increased speed of air circulation.

Ventilated roofs remove moisture from roof cavities structural members sheathing and insulation. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Ice damming can often make the roofing materials weak and. Homes are naturally filled with warm moist air on a daily basis thanks to human physiology and activities such as cooking and showering.

For a simple duo pitch roof bs 5250 specifies sufficient ventilation as being. This occurs through the rising of warm air and the falling of cooler air. Installing a roof ventilation system can help you in the following ways.