Many homeowners disregard the importance of ventilating their attics. Ensuring the attic is well ventilated can improve the lifespan of the roof, reduce the chances of mold and mildew in the attic and decrease utility costs. Bergen County roofing professionals typically recommend one square foot of attic ventilation for every 300 square feet of roofing.
As the house sits in the sun all day, it absorbs heat through its roof. This increases the temperature in the attic. As homeowners shower and wash dishes and laundry, moisture enters the air and finds its way to the attic. Without proper roof ventilation, the combination of hot air and moisture can create mold and mildew on the rafters, decking and insulation. In the winter, that same moisture can turn to ice, rusting the heads off nails and the other metal components fastening the roof onto place.
Signs of a poorly ventilated roof include a sudden increase in mold and mildew throughout the home that returns after the mold is cleaned from the surfaces. Homeowners may also notice buckling or curling shingles and roof sagging. In the winter, the homeowner may notice the formation of ice dams and icicles along the gutters.
In addition to roof damage, a poorly ventilated attic can increase cooling costs in the summer by forcing the air conditioner to work harder.
The roofing experts at All Professional Remodeling of Bergen County NJ can assist you with any questions regarding roofing, gutters or windows.
This can result in the need to replace the unit long before the end of its useful life.
In order to avoid damage to the roof, the attic must be properly ventilated with both soffit vents and roof vents. The soffit vents allow cooler air into the attic, which pushes the hotter air towards the top of the attic and out the roof vents. This air circulation keeps the attic at a stable temperature and reduces humidity levels.
The general rule of thumb is to have one square foot of ventilation for every three square feet of roofing. However, that one square foot of venting does not include obstructions to the airflow, such as vent slats or the material between the holes of the ventilated soffit.
For example, if a homeowner purchases a 12 inch by 12 inch soffit vent that has 50 percent of its opening covered with slats, it will only offer half a square foot in ventilation instead of one square foot. Therefore, homeowners must be vigilant when improving the ventilation of their attics to ensure they get enough square footage.