Attic Ventilation Work Sheet

For large volume attics such as where roof slopes are greater than 8 12 designers also should consider increasing.

Attic ventilation work sheet. The house measures 30 feet by 50 feet. Intake vents located at the lowest part of the roof under the eaves allow cool. 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. Ok to determine how much ventilation area you need for your house all you need to know is the square foot area of the attic to be ventilated.

Let s use the following simple ranch house for an example. About attic ventilation natural attic ventilation. To lower attic temperatures and to remove excess moisture. In other words the entire vent opening doesn t count as vented space.

In the winter allowing a natural flow of outdoor air to ventilate the attic helps keep. Some benefits of removing excess moisture include reducing. You can also contact your local municipality to check on building code in your area. Tips for assessing your needs.

A home s ventilation system consists of everything from roof vents to the best attic fans without the right roofing and attic ventilation system your home can become uncomfortable and cost more to cool or heat. Calculating ventilation area of attic kitchen ventilation text. That said air resistance and interference such as vent grates reduces the area of true ventilation. Ventilation of attic spaces is required by most building codes as well as by roofing material manufacturers and the national roofing contractors association nrca.

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. Attic ventilation serves two main functions. 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. 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.

Regarding attic ventilation nrca recommends designers provide at least 1 square foot of nfva for every 150 square feet of attic space 1 150 ventilation ratio measured at the attic floor level ceiling. At first it may seem odd to add insulation for warmth and then purposely allow cold air to enter the attic through vents but this combination is the key to a durable and energy efficient home. Calculate or enter the square footage of the attic or area to be vented. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.