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.

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. Standard attic vents like af 50 s ventilation fans or solar powered attic fans. The roofing industry also has practical guide lines for attic ventilation. 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. A ridge vent is a ventilation strip that is placed along the ridgeline of the home. Intake vents located at the lowest part of the roof under the eaves allow cool. Code requirements the international building code.

Ventilation attic spaces cont. Calculate or enter the square footage of the attic or area to be vented. Most effective ventilation uses a ridge and soffit continuous ventilation system but even these designs can vary from roof to roof. Typically building codes include minimum requirements applicable to attic ventilation.

Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems. 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. 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. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

It is important that air movement occurs and is not impeded by any framing members of the. Other options to meet your attic ventilation needs are. A minimum of 1 inch 25mm of air space shall be provided between the insulation and the roof sheathing. 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.

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.