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Attic ventilation. Roof vents, Soffit vents. Ridge vents. Turbine vents.
Not enough attic ventilation will lead to condensation, mold and/or wood rot in the rafters, trusses, roof sheathing and expensive repairs.
The most used vents are: Soffit vents (rectangular and continuous), Ridge vents, Cupola vents, Turbine Vents and Powered attic vents.
Vents should be uniformly spaced to provide good cross ventilation from end to end and from top to bottom. Vents come in many shapes, sizes and colours and are made from aluminum or vinyl.
50% Of the ventilation should be located in the soffits, or eaves, and 50% near the ridge or peak.
The first five vents discussed below are fixed non-powered devices and take advantage of the natural flow of air. Cool air enters the lower vents, is warmed, then rises and exits through the upper vents to expel both heat and humid air.
This group of vents is economical, effective, have no moving parts that can seize, are relatively easy to install and last a lifetime.
Roof vents are installed near the ridge and are the most common vents for this location.
Soffit vents should be installed close to the fascia board. The vents can be either the continuous type which run the length of the soffit or the rectangular shaped vents which should be evenly spaced.
The continuous strip vents provide more ventilation, but are more expensive to install. Soffit vents should be kept open and free of insulation by installing baffles in the attic.
Ridge vents run as the name already suggest along the ridge. Metal ridge vents are available in a choice of factory finished colours.