Attic Ventilation Work Sheet

If you don t know how your roof vents work or if you re unsure about your attic ventilation in general you should talk to a roof inspector about your current system and any inherent weaknesses that may be at.

Attic ventilation work sheet.

Standard attic vents like af 50 s ventilation fans or solar powered attic fans. Typically building codes include minimum requirements applicable to attic ventilation. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. A ridge vent is a ventilation strip that is placed along the ridgeline of the home.

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. Other options to meet your attic ventilation needs are. Prior to installing the ridge vent a 1 inch wide strip of roof decking is cut out along both sides of the ridgeline to allow for air movement through the vent. The roofing industry also has practical guide lines for attic ventilation.

A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing. Ventilation attic spaces cont. Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. Intake vents located at the lowest part of the roof under the eaves allow cool.

If you are in the puget sound area of washington state and would like to have a free attic ventilation evaluation or roof estimate please contact us at 253 445 8950 or fill out our quick estimate form. 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. It is important that air movement occurs and is not impeded by any framing members of the. See the benefits of attic ventilation a new roof is more than just shingles.

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. 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. The net free ventilating area shall not be less than 1 300 of the area of the space ventilated. Calculate or enter the square footage of the attic or area to be vented.

See attached required attic ventilation shall be provided for all reroof projects as determined from the attic ventilation worksheet.