Proper Airflow In Attic

Ventilation can be accomplished using various products and techniques.

Proper airflow in attic.

This is normally the point where air enters your attic. Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge. Don t avoid ventilating your attic for fear you re letting cold air into the house. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow.

Look at your eaves and roof. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. For the same reason insulation shouldn t touch the roof s underside. Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Building codes typically require 1 square foot of venting space for every 150 square feet of attic 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. Make sure there is air flow from the eaves. Before we explore how to.

In other words the entire vent opening doesn t count as vented space. Touch your ceiling on a warm sunny day. That said air resistance and interference such as vent grates reduces the area of true ventilation. The venting space should be equally divided between intake and outflow vents and the.

Obviously more research is needed but here s what we do know. Intake vents located at the lowest part of the roof under. A hot ceiling tells you that the attic is acting like a solar oven raising your cooling bills and. Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents.

If you don t see any attic vents on the roof or in the eaves you need to add some. Your actual living space is sealed. At first it may seem odd to add insulation for warmth and then purposely allow cold air to. If there are asphalt shingles on your roof the attic must be ventilated to comply with the terms of the.

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. About attic ventilation natural attic ventilation. Your roof vents may not look.