Attic Ventilation Worksheet Fresno

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 worksheet fresno. The net free ventilating area shall not be less than 1 300 of the area of the space ventilated. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. Other options to meet your attic ventilation needs are. See attic ventilation worksheet typical values for attic vents soffit vents 3 5 x 14 5 30 sq ins 3 5 x 22 5 50 sq ins 5 5 x 22 5 80 sq ins small dormer vents 50 sq ins large dormer vents 100 sq ins ridge vents per icc evaluation report.

Up to 6 12 7 12 to 10 12 11 12 and up. 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. 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.

Calculations are based on 1 square foot of net free area for every 150 square feet of attic floor space. 1 300 of the attic floor area. Attic ventilation calculator note. See the benefits of attic ventilation a new roof is more than just shingles.

Enter the width and length of your home including overhang in feet. This cap features both a back draft damper and bird screen preventing outside air from entering the home and birds and small pests from entering duct work. 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.

A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing. Distributed equally around the structure. Select the roof pitch that is closest to yours. Ventilation attic spaces cont.

Standard attic vents like af 50 s ventilation fans or solar powered attic fans. 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. The rvk1a steel roof cap kit is an the rvk1a steel roof cap kit is an easy to install vent for ventilation fans bath rec room home gym etc.