Roof Ventilation Air Flow

Air flows in through the soffit vents and out through the roof vents.

Roof ventilation air flow.

Ventilation and attic vents. If you see dampness or frost you need better roof ventilation and some attic vents. 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. For the best results place roof ventilation near the roof s peak and soffit vents in the eaves.

Roof intake venting with no outlet vent openings won t work because there will be no air flow through the roof cavity. A new roof is more than just shingles. Roof ventilation ventilation provides the conditions that allow air to flow out with the hot air and in with the cool air. The soffit vents allow convective air movement from the soffits of the residence to the ridge vent.

Vents come in various styles. See the benefits of attic ventilation. 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. 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.

Without baffles blinders that prevent outside air from crossing over the vent a ridge vent may create almost no ventilation at all. The following product options will allow you to achieve an intake nfva of 528 square inches. Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available.

Achieving calculated continuous and unimpeded airflow through the roof cavity is relatively straight forward. Help remove excess heat and moisture to protect your roof from premature deterioration. 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. Allows cool dry air to enter the attic.

Gable vents may circulate air through only a small percentage of your attic. In a few cases very wide open soffit vents at building eaves seem to result in a dry attic but the design relies on a prevailing wind pattern that sends air through the attic. When stale overheated air in your home or attic is vented out and fresh air is pulled in you have an air exchange effective ventilation requires a balancing act. Whilst it is possible to retrofit passive ventilation solutions to existing buildings it is highly recommended to incorporate passive ventilation during the design phase of any new building project.