Typically building codes include minimum requirements applicable to attic ventilation.
Attic ventilation work sheet.
Calculate or enter the square footage of the attic or area to be vented.
A ridge vent is a ventilation strip that is placed along the ridgeline of the home.
The roofing industry also has practical guide lines for attic ventilation.
It is important that air movement occurs and is not impeded by any framing members of the.
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.
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.
Code requirements the international building code.
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.
A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing.
See attached required attic ventilation shall be provided for all reroof projects as determined from the attic ventilation worksheet.
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.
Other options to meet your attic ventilation needs are.
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.
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.
The net free ventilating area shall not be less than 1 300 of the area of the space ventilated.
Standard attic vents like af 50 s ventilation fans or solar powered attic fans.
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.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
See the benefits of attic ventilation a new roof is more than just shingles.
