Proper Airflow In Attic

If there are asphalt shingles on your roof the attic must be ventilated to comply with the terms of the.

Proper airflow in attic.

Your actual living space is sealed. Don t avoid ventilating your attic for fear you re letting cold air into the house. Look at your eaves and roof. At first it may seem odd to add insulation for warmth and then purposely allow cold air to.

For the same reason insulation shouldn t touch the roof s underside. Intake vents located at the lowest part of the roof under. Your roof vents may not look. In other words the entire vent opening doesn t count as vented space.

If the soffit of your home isn t perforated to allow air movement either replace it with perforated soffit or install round air vents under the eaves to allow air flow. Touch your ceiling on a warm sunny day. That said air resistance and interference such as vent grates reduces the area of true ventilation. Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents.

Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. Ventilation can be accomplished using various products and techniques. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.

A hot ceiling tells you that the attic is acting like a solar oven raising your cooling bills and. Building codes typically require 1 square foot of venting space for every 150 square feet of attic space. The venting space should be equally divided between intake and outflow vents and the. Before we explore how to.

Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Obviously more research is needed but here s what we do know. Make sure there is air flow from the eaves. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow.

About attic ventilation natural attic ventilation. If you don t see any attic vents on the roof or in the eaves you need to add some. This is normally the point where air enters your attic.