When you re-roof your home, it is the perfect time to make sure that your home’s attic ventilation is functioning properly.
Proper attic ventilation requires intake vents for fresh air and exhaust vents. Ventilation takes advantage of convective airflow (warm air rises) to keep bathing your attic with fresh air, pushing out the warm, moist air. Intake vents are usually located in the eave overhangs (soffits) of your home while exhaust vents are usually at or near the ridge (peak) of your roof.
Most building codes require one square foot of vent area for every 300 square feet of attic floor space. The vent spaces should be balanced 50-50 between intake and exhaust vents. If anything, you want to have slightly more intake than exhaust vents. Having more exhaust vents than intake vents can cause the exhaust vents to act as intake vents, drawing weather in from the roof surface.
When you re-roof your home, an analysis should be done on the ventilation. It is also the right time to make sure that your intake vents have not gotten blocked by insulation or debris over the years.
Many people including contractors mistakenly believe that the heat-reflective finishes on today’s metal roofs reduce the need for attic ventilation. That is not true. Ventilation should still be done per code. Inadequate or reduced ventilation, unless the home has been specially constructed to not require ventilation, will lead to higher energy costs, ice dams, and a huge risk of attic condensation and mold. Regardless of what type of roof your home has, ventilation is very important.
Unfortunately, when it comes to ventilation, many contractors do not understand the basics and neglect to talk to homeowners about it. If you’re talking to a roofing contractor and they are not at least touching on the subject of ventilation, it is time to find a different contractor!
We Can Help
Remember, if your roof needs to be replaced, metal can still be installed in cold weather. We at Fine Line Improvements are available to help you figure out your roofing and ventilation needs. Give us a call at 585-269-9069 or contact us anytime with your questions!