When determining the ventilation needs of your home, a professional roofer will calculate the required “net free” ventilation space needed for your roof, and select ventilation equipment that will meet these needs. A vent’s effectiveness is measured by its Net Free Vent Area. The Net Free Vent Area is the portion of the opening in…
To properly ventilate an attic, two types of vents are needed. Intake vents, which are located at the down slope edge of the roof (a.k.a. eaves) and allow fresh cooler air into the attic; and exhaust vents, which are located near or on the ridgeline of the roof and allow warmer air to leave the…
There are several common misconceptions about attic ventilation. Many people believe if they have only power vents or turbine vents working near the ridgeline, their attic is properly ventilated. In order for exhaust vents to properly function, they have to have intake vents working with them. Air has to enter somewhere. If there are no…
Attic ventilation is an important part of roofing. Proper attic ventilation extends the life of a roof and reduces problems because it minimizes the temperature differential between the attic and the air outside. Proper ventilation will remove moisture and heat from the attic. Trapped heat and moisture can raise energy costs, cause ice dams, and…
Condensation – when water vapor cools and becomes a liquid – can occur inside homes and buildings, and often leads to damage and deterioration. Condensation can occur when there is high interior humidity and the temperature of interior building components is at or below the dew point temperature. Condensation that forms inside home attics and…
Attics that are vented improperly allow heat and moisture to remain trapped in the attic and create potential problems like wood rot, mildew and deterioration to the home’s structure. The impact of ventilation on the performance of a roof is so great that all major shingle manufacturers VOID their warranties if their shingles are installed…