There is a reason for attic ventilation minimums to be recommended when building a home. Proper ventilation helps your home stay cooler in the summer and prevents ice dams in the winter. Attic ventilation will also lower your risk for developing mould. However, like all good things, striking a balance is the most important. Each additional vent is a place where leaks can develop a little more easily than on the rest of the roof deck.
Along with shingle colour, insulation, and controlled sun exposure, good roof ventilation is going to help make your home more energy efficient during the summer. Attic vents allow stuffy, summer air to escape through the roof causing an updraft of cooler air from the basement and any open windows. Depending on your home’s build, attic ventilation will probably not contribute to the energy efficiency of your home as much as having a well insulated attic for example, but ventilation will make a small difference. It’s also useful to remember that some shingle manufactures only provide warranties on their products if the roof is vented.
When air cools, it loses some of its moisture. In a cold attic, that can lead to humidity problems if the space is not vented. Ventilation helps with moisture issues by keeping air circulating. The moving air evaporates any condensation and moves it outside of your home. Good ventilation is an important part of this process, however, the best way to prevent moisture problems is to control your home’s humidity in the first place. Keeping your home’s humidity at around 35% will help reduce risks of moisture related problems.
Because attic ventilation helps with both thermal and humidity control, it’s probably easy to understand why it also help with preventing mould. In order for mould to grow, a surface must remain damp for at least 24-48 hours. The best way to prevent mould is to control the humidity of your home. By keeping moisture levels down and having ventilation that whisks away any condensation that does form, your attic should be in great shape to prevent mould growth.
Attic ventilation is an excellent tool for helping to keep your home cool during the summer, dry during the winter, and free of mould all of the time. However, too much ventilation is not going to help your home and may cause more problems than no ventilation at all. If you think your home could benefit from attic vents, then talking to the experts at the Roof Hospital is the next step. Call us today at (403) 457-3330.