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Roof Ventilation and Insulation Guide From ImproveNet
Your guide to understanding ventilation and issues poor air venting and insulation play in roofing.
Proper ventilation is one of the most critical factors in a durable roof system. Without the
necessary ventilation, heat and moisture can build up in an attic area. They combine to cause
rafters and sheathing to rot, shingles to buckle, and insulation to lose its effectiveness.
Ideally an attic should have:
- a gap-free layer of insulation on the attic floor to protect the house below from heat gain or loss
- a vapor retardant under the insulation and next to the ceiling to stop moisture from rising into the attic
- enough open, vented spaces to allow air to pass in and out freely
- a minimum of 1 inch between the insulation and roof sheathing
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Ventilation requirements may vary greatly, depending on which state your home is located, as well as the
structure's conditions. The recommended ventilation is a minimum of 1 square foot of free vent
area for each 150 square feet of attic floor. Proper attic ventilation will help prevent
structural damage caused by moisture, increase roofing material life, reduce energy consumption
and enhance the comfort level of the rooms below the attic.
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Whole house fans or wind turbines are also an idea for efficient cooling. When whole-house fans are
used in conjunction with roof wind turbines a temperature drop of 3 to 8 degrees can be achieved
within minutes. Wind turbines work by drawing in the cool outside air, flushing all the hot air
out of your home and attic in minutes.
• Reasons for Roof Repair
• Repair vs. Re-roof
• Covering/Roofing Materials •
• Roof Slope and Style
• Roof Ventilation
• Roofing Maintenance and Tips •
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