Too Much Ventilation In Attic

Attic ventilation myths that are off the charts 1.

Too much ventilation in attic.

Hot air exhaust vents located at the peak of the roof allow hot air to escape. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. If a roofing contractor is going to be out of balance with the attic ventilation system it s better to have too much intake than too much exhaust because the excess intake converts to exhaust on the leeward side of the house. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

Always have a balanced ventilation system. Just like properly sizing your furnace and air conditioning unit you want precisely. More attic ventilation is good. When you have gable vents the airflow coming in through the soffit or overhang vents can be disrupted by cross ventilation from the gable.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Most experts contend that a well ventilated attic keeps the house more comfortable in summer and guards against moist heated air building up in winter. In the last several decades building codes have called for increased attic insulation. A wind turbine catches the wind and spins a fan which pulls hot air outside.

Dangers of too much ventilation. Attic ventilation keeps the air moving and stops mold from growing but too much ventilation can be just as bad as having none. If your attic is well insulated the insulation might be plugging the spaces between rafters just above exterior walls. You can also contact your local municipality to check on building code in your area.

To keep air flowing your roof needs just the right amount of attic ventilation. Too many people believe the importance of roof ventilation is to increase energy. Most building codes require a ratio of 1 150 ventilation space to attic floor space. There are also dissenting voices who say that the benefits of ventilation are overrated.

That means air can t flow from the soffit vents to the roof vents. The two main dangers associated with too much ventilation involve roof damage and increased utility bills. The solution is to add baffles which allow air to flow past the insulation photo 9. With a power switch or a thermostat installation an attic fan can be turned on to let hot air from the attic out.

2 focusing only on heat buildup. They can disrupt the air flow through the attic.