Attic ventilation is an important part of roofing. Proper attic ventilation extends the life of a roof and reduces problems because it minimizes the temperature differential between the attic and the air outside. Proper ventilation will remove moisture and heat from the attic. Trapped heat and moisture can raise energy costs, cause ice dams, and damage roof system components as well as structural and personal items located inside the attic where temperatures can easily reach 150° F (65° C).
The best type of roof ventilation for most homes occurs when cooler air can enter the attic through soffit or fascia intake vents. These vents can be seen from the ground and are located behind the gutters. As the cooler air warms and rises, the warm air is vented out through exhaust vents mounted on or near the top of the roof. Both intake ventilation and exhaust ventilation installed at an approximate one to one (1:1) ratio are required for maximum air circulation. One square foot of ventilation per 300 square feet of attic floor space is a general guideline and is a code requirement in some areas.
Without these vents, heat and moisture will build up in the attic area and combine. This combination causes the sheathing to rot, shingles to age prematurely, and the roof insulation to lose its effectiveness.
If you suspect you may have damage due to poor roofing ventilation, contact Minnesota Building Contractors today. Call 507-206-9607 or submit a free roofing evaluation request.