Attic Ventilation Worksheet Fresno

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.

Attic ventilation worksheet fresno.

Standard attic vents like af 50 s ventilation fans or solar powered attic fans. 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. Calculations are based on 1 square foot of net free area for every 150 square feet of attic floor space. 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.

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. Ventilation attic spaces cont. Up to 6 12 7 12 to 10 12 11 12 and up. Other options to meet your attic ventilation needs are.

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. 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. 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.

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. 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. Distributed equally around the structure. 1 300 of the attic floor area.

It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. Attic ventilation calculator note. The net free ventilating area shall not be less than 1 300 of the area of the space ventilated. Enter the width and length of your home including overhang in feet.

Select the roof pitch that is closest to yours. 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. A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing.