Roof and Attic Ventilation
Roof and attic ventilation is an integral part of making a roof last, and occurs naturally when vents are placed at the base of the roof (at the eaves or in the soffits) and near the top of the roof (the ridge) so that warm air can leave through the top, and cool air can be drawn through the bottom. This process does not need electrical or mechanical fans in most cases, as nature will do the work on its own. However, when vents are placed you should be aware of the following guidelines:
1. Vents should not be inserted into the middle sections of the roof, since this will often interrupt the natural circulation of the air. Instead, evenly distribute vents along the roof, to ensure even airflow to all portions of the roof.
2. Approximately half of the vents should be placed near the ridge and the other half near the eaves or soffits, to encourage maximum airflow.
3. Approximately 1 square foot of ventilation per 300 square feet of attic floor space should be included in the plans for your new roof (this is an approximate and depends on climate, roof pitch, orientation and available attic vent space).