Design Attic Ventilation

Of net free area for every 150 sq.

Design attic ventilation. Good ventilation allows the heat and moisture to escape. Unvented design unvented attic design falls into two categories. Advantages of proper roofing ventilation. That keeps your attic dry and reduces ice dams.

A ridge vent is a ventilation strip that is placed along the ridgeline of the home. Most effective ventilation uses a ridge and soffit continuous ventilation system but even these designs can vary from roof to roof. These attic or roof ventilation recommendations are based on a survey of building science literature combined with 40 years of building inspections on the observation of the locations of moisture mold ice dams condensation stains and other clues in buildings and on the correlation of. In the summer good attic ventilation reduces heat buildup.

The installation of roof vents is a crucial part of roof design because it allows for proper attic ventilation which may help prevent condensation and early aging of your roofing materials. Systems where condensing surface temperatures are not controlled figure 4 and systems where condensing surface temperatures 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. This means for every 150 square feet of attic floor space there should be 1 square foot of net free area.

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. Roof ventilation choices design specifications. Enter square footage calculate or enter the square footage of the attic or area to be vented. In the winter warm moist air seeps into the attic from the living space below.

Intake vents located at the lowest part of the roof under the eaves allow cool. That cuts cooling costs and prolongs shingle life. 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. With vented attic assemblies moisture that diffuses into the attic space from the conditioned space is vented to the exterior by attic ventilation.

The code minimum for attic ventilation in the 2012 irc section r806 roof ventilation 1 is as follows. It is important that air movement occurs and is not impeded by any framing members of the. See the benefits of attic ventilation a new roof is more than just shingles.