Attic ventilation calculator note.
Attic ventilation worksheet.
Other options to meet your attic ventilation needs are.
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.
Calculations are based on 1 square foot of net free area for every 150 square feet of attic floor space.
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.
Up to 6 12 7 12 to 10 12 11 12 and up.
Gaf attic ventilation calculator.
Furthermore nrca also rec ommends the amount of ventila.
Let s look at the following example.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
Of attic space 1 150 ventilation ratio measured at the attic floor level ceiling.
Use this calculator to help determine the proper amount of attic ventilation based on u s.
You can also contact your local municipality to check on building code in your area.
Jones has an attic space that measures 23 feet by 48 feet.
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.
Insulation at least r 38 or more is there for heating and.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
It can do both.
Ridge vent must me installed per the manufactures instructions.
Best ventilation is open soffit venting to a open vented ridge vent.
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.
Intake vents located at the lowest part of the roof under the eaves allow cool.
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.
Ridge vents are one of the easiest ways to meet roof venting requirements.
Enter the width and length of your home including overhang in feet.
See attached required attic ventilation shall be provided for all reroof projects as determined from the attic ventilation worksheet.
Select the roof pitch that is closest to yours.
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.
Calculate or enter the square footage of the attic or area to be vented.
Most building codes require a ratio of 1 150 ventilation space to attic floor space.
