No Attic Ventilation

The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available.

No attic ventilation.

Ibc requires ventilation in attics and crawl spaces and does not address the unvented attic concept. These fans circulate the air within the. Without proper ventilation moisture from everyday activities such as showering washing laundry and washing dishes rises to the attic and slowly collects there. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

This is called passive ventilation. If the attic ventilation system is not a balanced combination of intake vents installed in the soffit under eave or at the roof s bottom edge and exhaust vents installed at or near the roof s peak the attic ventilation system will not be efficient and effective. The most common way to add ventilation to an attic is by installing air intakes in the soffits and putting an outlet at the gable of the house. Your roof may have a ridge vent which is a low profile continuous roof air vent running along the peak of the roof.

Your roof vents may not look anything like the ones shown in this article. If you don t see any attic vents on the roof or in the eaves you need to add some. Since 2004 international code council icc supplements to the international residential code irc mean unvented attic assemblies have been accepted by the building codes in residential but not commercial applications. One reason for the lack of agreement over attic ventilation is the tremendous variation in climate across north america.

Look at your eaves and roof. Intake vents located at the lowest part of the roof under the eaves allow cool. However many building code officials have accepted unvented attics on a case by case basis when presented with compelling evidence such as hygrothermal modeling of. Without baffles blinders that prevent outside air from crossing over the vent a ridge vent may create almost no ventilation at all.

It must also circulate. For proper ventilation it isn t enough for air to simply get into your attic. For this reason the square footage of vent space at the base of the roof and at the peak. Improperly installed attic ventilation cannot address two important aspects of indoor comfort.

Rarely will you find a building practice that works everywhere. Gable vents may circulate air through only a small percentage of your attic. Attic venting fans attic fans serve a different function removing the hot and moist air from the attic and leaving the space below the attic floor alone.