There should be approximately 1 sf of roof ventilation for every 300 sf of attic space.
WEATHERPRO VENTS INSTALL
The best solution for this is to install intake vents lower down on the roof to allow for air intake. This decreases the amount of intake ventilation through the soffit, and in some cases due to roof design almost eliminates intake airflow. On newer homes building codes dictate that non-vented soffit is installed within four feet of property lines. The solution to this can either be to pull back the insulation to allow for an airspace or install intake vents lower on the roof to allow for air intake. Sometimes insulation will be installed to increase the energy efficiency of the home, however there must be a space left between the bottom of the sheathing and the insulation and must not be installed over the soffits or else it will cause problems. Sometimes aluminum soffit will get installed over this and if there is no ventilation cut into the plywood before it is installed it can hide the problem. On older homes there will sometimes be plywood soffits installed with no or minimal ventilation. Intake ventilation is typically through the soffits. There are issues with both older and recently built homes over this for different reasons. If you have ever had any problems with moisture in the attic or suspect you may have a problem let us know and we can troubleshoot the issue. Proper ventilation requires an adequate amount of intake ventilation, effective exhaust ventilation and properly installed ducting from any hood fans to the goosenecks. Inadequate ventilation can result in drastically reduced shingle life and severe moisture problems in the attic. Ventilation is an often overlooked but extremely important component of the roof system.
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