You probably envision your roof first as shingles, overlapping pieces that protect your house from the elements. But your roofing system has much more to offer than shingles-attic insulation and ventilation play a crucial role in the health of your roof and house.

Attic ventilation reduces temperature differences between inside and outside the attic by pulling fresh air up and pushing heat and moisture out.

The importance of this is especially clear in humid climates, such as Florida, where everyday tasks, such as doing laundry, cleaning dishes, and taking a shower, can increase moisture levels and raise temperatures well above 150 degrees.

The solar-heated air is expelled through your roof reducing the building’s cooling load and extending the life of your roof’s shingles. This in turn saves energy and lowers the cost of maintaining your air conditioning system.

Roof vents are available in a variety of types and styles. The optimal venting system for your house is the one that takes into account how much airflow is desired along with your roof’s design. This, not every home requires the same ventilation system.

A few common vent types include box vents, power vents, soffit vents, and ridge vents.
Natural convection creates an opening for rising hot air and moisture to escape through box vents installed over holes cut into the roof.

PAVs, or power ventilators, are roof or gable-mounted devices which utilize electric motors to turn large fans to exhaust hot air and moisture from the attic.

At the lowest point of the roof, soffit vents let outside air enter the attic. They are typically made of PVC or aluminum. When installed with ridge vents, they are most effective.

The ridge vents, which are installed at the peak of a sloped roof, are a static, no-moving-parts vent system.

When combined with the soffit vents, they create a system that regulates the temperature on the roof.

In most building codes, the ratio of vented areas to attic space is 1 square foot per 300 square feet of vapor barrier material, which prevents moisture from entering the fabric of the building. When a vapor barrier is not used, the ratio is 1 to 150.

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Installing a ventilation system with an inefficient combination of intake vents (located in the soffit/under-eave or at the roof’s bottom edge) and exhaust vents (located at or near the roof’s peak) could result in inefficiency and ineffectiveness, as well as expensive repairs, such as mold and mildew growth and saggy or spongy decking, as well as deterioration of floorboards, shingles, or underlayment.

Your roofing, insulation, and ventilation systems should work in harmony with each other when you hire a reliable roofing contractor. In addition to being able to spot any inherent weaknesses in your existing system, they will find out how many intake and exhaust vents you need based on the size of your home.

If you have any questions about ventilation or the health of your roofing system, call Legend Roofs today at 405-352-7307.

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