Our homes need to breathe, and that includes your attic. Soffit vents are found below the eaves of your roof, to allow fresh air from outside to flow into your attic and replace the air there. This process of exchanging attic air is called ventilation. In addition to soffit vents, your house also needs ridge and/or gable vents near the peak of your roof where the air can leave the attic.
Benefits of Soffit Vents for Ventilation
Ventilation is key to increasing the life of your roof, because moisture trapped inside your attic may allow wood rot to begin. In the summer, you can save money on air conditioning while in the winter, soffit vents can help prevent ice dams.
Calculating The Amount of Soffit Vents Needed
You need some math to calculate the amount of soffit vents you need to provide enough attic ventilation. Here are the numbers you need to calculate, and TodaysHomeowner.com has more details to calculate how many square feet of soffit vents you need.
- Calculate the volume (cubic feet) of air in your attic.
- Divide the cubic feet by 150 square feet, to determine how much vent space your need.
- Divide the vent space by two, as you need equal vent capacity at the bottom of the attic (soffit vents) and near the roof (ridge and gable vents).