Passive Attic Ventilation

You don t want your unfinished attic cooled by your air conditioner.

Passive attic ventilation. It alleviates moisture in the winter and heat in the summer to extend roof membrane life. Soffit venting is your main source of intake for an attic. Lots of soffit venting. Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation.

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. The keepa attic vent is used for ventilating attics and or plenum as a roof exhaust vent or as an air intake roof vent. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. The key is to balance incoming air with outgoing and perform an annual maintenance checkup.

Laying fiberglass rolls is easiest for a diy job. It is also ok if you have a little more air coming in than you do going out ie. Roof vents enhance the overall comfort of the house by providing escape hatches for hot stale moist air which can reach temperatures of 150 degrees in summer. 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.

Passive ventilation doesn t require electricity so it saves energy and cuts down on carbon monoxide emissions. This type of ventilation is especially important for. Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area. Passive roof vents encourage natural air flow and work without the aid of motorized fans.

Calculate or enter the square footage of the attic or area to be vented. 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.

The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less. Passive roof vents expel excess heat and moisture. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans.