Why Do You Need Ventilation In The Attic

Federal housing administration recommends a minimum of at least one square foot of attic ventilation split evenly between intake and exhaust for every 300 square feet of attic floor space.

Why do you need ventilation in the attic.

The downside of attic ventilation fans. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca. One reason for the lack of agreement over attic ventilation is the tremendous variation in climate across north america. Good insulation reduces fan effectiveness.

However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the. The commonly accepted calculation for sizing vents is 1 square foot of vent opening to 175 square foot of attic area. Throughout the balance of this digest the terms attic and roof will and can be used interchangeably. Rarely will you find a building practice that works everywhere.

For instance attic ventilation is used widely in cold climates to evacuate the warm moist air that escapes from the living space below. Attic ventilation fans whether hard wired or powered by their own solar panels seem like a low cost and effective way to help keep your house cool. All you need to know about attic ventilation understand the pieces and parts that contribute to quality attic ventilation so that you can better cool down the space and prevent roof damage all. In cold climates the primary purpose of attic or roof ventilation is to maintain a cold roof temperature to control ice dams created by melting snow and to vent moisture that moves from the conditioned space to the attic ventilation acts to bypass the vapour barrier created by most roof.

In other words the entire vent opening doesn t count as vented space. How you can improve your attic ventilation. Attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside. How much venting do you need.

Effective ventilation provides year round benefits creating a cooler attic in the summer and a drier attic in the winter. The size and placement of vents depends on the roof configuration and the size of the attic. However the utility of attic ventilation fans is actually quite a controversial topic. This 1 300 rule is general and may not apply to all buildings.

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. Attic ventilation is an intake and exhaust system that creates airflow designed to decrease the difference in temperature between the outdoor air and the air inside the attic. What does attic ventilation do for my home. Ventilation can be accomplished using various products and techniques.