They’ve Come a Long Way Since the Pyramids

Posted on: 1 March 2023

If you remove an old metal roof from your home and replace it with asphalt shingles, the new roof must be appropriately vented. Adequate ventilation not only helps extend the life of the shingles but also improves the overall energy efficiency of your home. 

Here's what you need to know about roof ventilation systems professionally installed with asphalt shingle roofs.

Why is Proper Roof Ventilation Important?

Proper roof ventilation is crucial for several reasons. A ventilation system's main job is to control the temperature and amount of moisture in your attic. If your roof lacks ventilation, heat and humidity can build up and damage the decking and shingles, causing them to age and break down faster. Proper ventilation can also help prevent ice dams during winter, leading to water damage to your home's interior.

Types of Roof Ventilation Systems

There are two primary types of roof ventilation systems: intake vents and exhaust vents. Intake vents are typically located at the bottom of the roof and allow fresh air to enter the attic space. Exhaust vents are located at the top of the roof and allow hot, moist air to escape. To keep a steady flow of air, ventilation needs a balance of both intake and exhaust vents.

Intake Vents

Intake vents are usually installed at the eaves of the roof, which are the edges that overhang the exterior walls. The most common intake vents are soffit vents and continuous ridge vents.

Soffit vents are small, screened vents installed along the underside of the eaves. They allow fresh air to enter the attic space and are typically installed every few feet. Continuous ridge vents are put in along the entire length of the roof's peak. This lets air come in from the top of the attic.

Exhaust Vents

Exhaust vents are installed at the top of the roof and are designed to allow hot, moist air to escape. The most common exhaust vents are ridge vents, static vents, and powered vents.

Static vents are small, passive vents installed near the roof's peak that rely on natural wind to create airflow. Ridge vents are put in place along the peak of the roof, letting hot air escape from the attic. Powered vents are similar to static vents but are powered by electricity and can move more air.

Professional Installation of Ventilation Systems

Proper installation of ventilation systems is critical to ensuring that they function correctly. During a professional installation, a roofing contractor will assess your home's post-metal roof ventilation needs and recommend the best type and placement of vents.

For more information, contact roofing contractors near you.