Proper ventilation is a critical factor in determining the lifespan of a roof
Properly ventilating your attic is one of the most important steps you can take to increase the longevity of your roof. Inadequate ventilation will vastly shorten the life of the roofing materials. On the other hand just adding additional ventilation is not always a good thing. There is a proper balance and design needed of intake vents and exhaust vents that abides by all codes for proper function.
During the colder months, the purpose of ventilation is to maintain a cold roof temperature to prevent ice damming. A properly ventilated attic will also remove excess warm air and moisture that moves up from the living spaces to the attic, which will prevent condensation or “attic rain”. If not properly ventilated, the sheathing could rot, leaks could start and/or mold could grow.
During the warmer months, the primary purpose of ventilation is to expel solar heated (hot) air from the attic. When trapped in the attic, this combination acts like an oven, cooking the roof materials and leading to premature shingle deterioration, shingle curling and overheating of the interior living spaces.
In some cases, manufacturers may not honor warranties on shingles that have incurred damage because of inadequate attic ventilation. Hubbard Roofing & Exteriors will ensure your ventilation system is balanced to ensure proper function so no warranties are at risk of being voided.
Examples of the most common intake roof vents and their functions include:
A free flow of air should easily travel into the soffit vents and through the attic, provided they are open and unobstructed. Adding baffles to prevent blockage will maximize ventilation.
Installed on the bottom edge of the rooftop, edge vents provide proper intake ventilation for homes with little or no overhang. They can also be used to supplement existing soffit or under-eave vents.
Examples of the most common exhaust roof vents and their functions include:
These types of exhaust vents should all be installed at the same height or level on the roofline. If vents are on more than one level, the higher vents will draw air from the lower vents instead of the intake vents. Intake air must come from the lower parts of the attic space to properly ventilate the entire attic.
Installed at the peak of the roof and hardly noticeable, ridge vents allow warm moist air to escape the attic space at the peak, provided you have adequate intake vents. Ridge vents can be good alternative to the static roof vents.
SPECIALTY ROOF VENTS
Power vents work particularly well on low slope roofs because the attic airflow from soffit to ridge is slower than steeper pitch roofing systems. On a lower slope roof the venting should be increased from the standard 300:1 to 150 sq. ft. to 1 vent.
There are many other roof top exhaust vents available such as turbines, phoenix vents, and stacking vents. During your free estimate we will evaluate all of your homes ventilation needs and present all available and necessary options.