Passive Attic Ventilation

This is usually expressed as a ratio.

Passive attic ventilation.

Calculate or enter the square footage of the attic or area to be vented. This type of ventilation is especially important for. It is also ok if you have a little more air coming in than you do going out ie. Soffit venting is your main source of intake for an attic.

This method relies primarily on natural air convection the upward movement of heated air because of its lower density but may also take advantage of wind generated pressure differences. It alleviates moisture in the winter and heat in the summer to extend roof membrane life. Laying fiberglass rolls is easiest for a diy job. To prevent this follow the air sealing and insulation strategies in this guide and make sure the attic is well ventilated using passive vents and natural air flow.

Lots of soffit venting. The key is to balance incoming air with outgoing and perform an annual maintenance checkup. Passive roof vents encourage natural air flow and work without the aid of motorized fans. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.

It s quiet inexpensive energy efficient and low maintenance because it requires no moving parts and has no operating costs. After installation the only maintenance needed is periodical cleaning of the filters. You don t want your unfinished attic cooled by your air conditioner. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans.

The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Passive roof vents expel excess heat and moisture. Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area.

In order to facilitate this exchange of warm and cool air the general rule of. A good goal with attic ventilation is to have a balanced amount of air coming in to the attic as you have of air leaving the attic. Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation.