Ventilation is a process where fresh air is provided to space and stale air is removed. The ventilation process can be natural or manmade. Proper ventilation brings in fresh air into the indoor environment which is essential for the health of the family. Ventilation also ensures removal of air pollutants, smoke and odour and reduces humidity. Ventilation is absolutely essential for the long-term performance of your roof and attic. The lack of proper ventilation can lead to this musty smell as well as bring in natural light. Ventilation can be accomplished using various products and techniques.
Air vents are used in the ventilation of roof assemblies to allow free flow of outside air to attics and ventilation spaces.
These allow outside air to enter into ventilation spaces and attics. Such intake vents should be placed near soffits or eaves when designing the roof for maximum benefit. These vents should be placed in such a manner that ventilation air intake and exhaust use the natural convection process for optimal ventilation. Commonly used products include single soffit vents, continuous soffit vents, and Drip edge or eave vents.
Soffit Vents should be used to ventilate pitched roofs, with a roof pitch of 15 degrees or more and the roof void is attic or loft space. Almost all homes are fitted with roof vents at the peak of the roofline, but when used along with soffit vents, these provide a much more efficient ventilation system.
These vents draw in air into attics and ventilation spaces to exit to the exterior. You will attain maximum benefit if you place the exhaust vents at or close to the roof assembly's ridge or high point. Ridge Vents are a type of exhaust vent and are installed along the length of a ridge. Ridge vents come in 2 types: shingle-over or nonshingle-over.
Weep vents are non-woven mesh vents, made from polyester plastic and treated with UV inhibitors and flame retardants. These are used in vertical joints between brick masonry in masonry wall construction to drain away moisture and promote airflow. These vents also keep insects at bay.
Air Bricks come in plastic and clay and are used together in walls with a telescopic underfloor ventilator for ventilating below suspended ground floors or with cavity sleeves for ventilation through external walls to inside of the building. The holes in the brick allow air to flow into the underside of your floor reducing the humidity, removing stagnant air and keeping the area cool.