Attic Ventilation Worksheet Fresno

Attic ventilation calculator note.

Attic ventilation worksheet fresno.

The net free ventilating area shall not be less than 1 300 of the area of the space ventilated. 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. Enter the width and length of your home including overhang in feet. 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. Ventilation attic spaces cont. Distributed equally around the structure. Calculations are based on 1 square foot of net free area for every 150 square feet of attic floor space.

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. Select the roof pitch that is closest to yours. A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing. Calculate or enter the square footage of the attic or area to be vented.

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

It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. See attached required attic ventilation shall be provided for all reroof projects as determined from the attic ventilation worksheet. 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. Current cbc requirement is 1 300 of the attic floor area.

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. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof. See the benefits of attic ventilation a new roof is more than just shingles.