Ventilation Options Available for a Metal Roof
Metal roofs are known for their strength, beauty and durability. When you install one on your house, you can be assured of a roof that will last several decades, provided you take good care of it. Metal is one of the most conductive materials available for roofing. This means that your roof can transmit lots of heat or cold into the house, depending on the prevailing weather. You need a reliable ventilation system to help you neutralise the conductive effects of the roof. The following are some of the ventilation options you can use to maintain ideal thermal conditions if you have a metal roof:
Just as the name suggests, these roof vents take the shape of the letter J. This type of vent is ideal for a pitched or flat roof, since it is a low-profile ventilation system. It is open on four sides to maximise the flow of air from multiple directions, reducing the impact of the heat or cold transmitted into the house by the metal roof. Additionally, the four open sides eliminate the buildup of moisture, which can be detrimental to some of the materials used to make buildings.
The best J-vents are made using galvanised steel. They can stand up to any type of weather. On the other hand, plastic provides a cheaper J-vent alternative, but it is not as durable. Extremely high temperatures, freezing and thawing can lead to cracking of plastic J-vents.
Round Base Vents
Round base vents come with a projecting collar or rim popularly referred to as a flange. Their work is to strengthen or support the main vent so that it can hold on firmly to a rail. Since the vent only has two open sides, there is a unidirectional flow of air. This is thus ideal for small attic spaces because it has lower airflow efficiency when compared J-vents. However, you can counter that effect by installing multiple vents. Additionally, you can opt for adjustable sizes to help you vary the rate of airflow depending on your ventilation needs.
Commercial Roof Vents
Metal roofs can also support commercial roof vents. The most popular ones are the wind-driven turbine ventilators, which are installed as large, round ,rotating balls on top of the roof. They have oil-impregnated bearings that drive fans to circulate air in and out of the building. You should either go for bronze or stainless-steel roof vents because of their excellent ability to stand up to weather elements.
Contact a metal roofing specialist for additional information.