Attic Ventilation Worksheet

It can do both.

Attic ventilation worksheet.

Insulation at least r 38 or more is there for heating and. The ridge vent is installed on the peak with nails and shingled over for aesthetic purposes. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. Furthermore nrca also rec ommends the amount of ventila.

Attic ventilation calculator note. Other options to meet your attic ventilation needs are. This yields a total area of 1 104 square feet. Best ventilation is open soffit venting to a open vented ridge vent.

Up to 6 12 7 12 to 10 12 11 12 and up. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. Of attic space 1 150 ventilation ratio measured at the attic floor level ceiling. Select the roof pitch that is closest to yours.

The attic ventilation worksheet shall be completed by the contractor applicant to determine the number of vents required to comply with minimum building code requirements. 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. 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. Most building codes require a ratio of 1 150 ventilation space to attic floor space.

Calculate or enter the square footage of the attic or area to be vented. You can also contact your local municipality to check on building code in your area. Use this calculator to help determine the proper amount of attic ventilation based on u s. For large volume attics such as where roof slopes are greater than 8 12 designers also should consider increasing the amount of attic ventilation to account for the additional volume of attic space.

See attached required attic ventilation shall be provided for all reroof projects as determined from the attic ventilation worksheet. Intake vents located at the lowest part of the roof under the eaves allow cool. Ridge vents are one of the easiest ways to meet roof venting requirements. Let s look at the following example.

Jones has an attic space that measures 23 feet by 48 feet. 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. Ridge vent must me installed per the manufactures instructions. Enter the width and length of your home including overhang in feet.

One last thought attic ventilation is not there to get rid of heat it is there to get rid of excess moisture accumulating from the home.