How much attic ventilation is enough?  The most ventilation is needed to take away heat in the summer months. Winter attic ventilation must be enough to remove moisture vapor moving from the living space to the attic. In general, ventilation satisfactory for summer cooling is more than satisfactory for winter ventilation. Studies indicate that further raises in ventilation are not effective in significantly reducing attic temperatures.
If the ceiling ispoorly insulated, you may need a little additional ventilation. Attic ventilation can beaccomplished by gravity ventilators, wind assisted ventilators or power ventilator. Regardless of the method used, the purpose is to provide uniform ventilation of the attic for proper temperature and moisture control. Natural ventilation is the most common and energy-efficient method of attaining attic temperature and moisture control. It is also the most inexpensive, and my personal preference. If a space has high air outlets in conjunction with low inlets ,ventilation occurs as the air within the space is heated.
At Roof Doctor, we prefer to accomplish this with the use of eyebrow vents, installed at optimum locations.
If you would like a free evaluation and quote for upgrading your attic ventilation, you can submit a quick online request HERE or give us a ring at (800) 409 – 4910.


The Benefits of Roof Ventilation


Allows outside air to flow naturally upward and out of attic.
Promotes a cooler, drier attic.
Helps prevent moisture from becoming trapped in insulation, structural wood, shingles and roof deck.
Helps prevent rotting, mildew, drywall damage, peeling paint and warped siding.
Provides year-round performance for consistent ventilation without energy consumption.
For a balanced ventilation process, you should have 50% of your NFV (net free ventilation) at the upper third of the roof and 50% at the lower third.
 BALANCING VENTILATION IN THIS MANNER ALLOWS FOR AIR INTAKE TO OCCUR AT THE LOW POINTS AND EXHAUST TO TAKE PLACE AT HIGH POINTS. AIR MOVEMENT FROM LOW TO HIGH POINTS IS AIDED BY NATURAL CONVECTION. 
In attics which are not adequately vented, moisture is also produced by simple condensation. The air inside an improperly vented attic will be warmer than the air outside. When this warmer, moist air comes in contact with the colder roof sheathing condensation will happen. In effect, it can basically "rain" in your attic. 


The “eyebrow vent” is a low profile, hard galvanized steel vent, with a considerable flange that differs in size depending on what kind of roof it is to be installed on.


Use of the Eyebrow vent is a very practical and successful way to ventilate your attic. Eyebrow vents are set up on your roof, and can be used as attic intake vents, as well as attic exhaust vents and it is our preferred method to use when possible.
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