Passive Attic Ventilation

Laying fiberglass rolls is easiest for a diy job.

Passive attic 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. Lots of soffit venting. 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. 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.

This is usually expressed as a ratio. 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. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Soffit venting is your main source of intake for an attic.

Passive roof vents expel excess heat and moisture. It alleviates moisture in the winter and heat in the summer to extend roof membrane life. It s quiet inexpensive energy efficient and low maintenance because it requires no moving parts and has no operating costs. Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation.

This type of ventilation is especially important for. You don t want your unfinished attic cooled by your air conditioner. In order to facilitate this exchange of warm and cool air the general rule of. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans.

The keepa attic vent is used for ventilating attics and or plenum as a roof exhaust vent or as an air intake roof vent. Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area. Passive ventilation doesn t require electricity so it saves energy and cuts down on carbon monoxide emissions. 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.

After installation the only maintenance needed is periodical cleaning of the filters. 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.