What kinds of ridge vents are used on a roof?
Rigid shingle-over vents
Molded plastic sections, commonly about 4 feet long. They resist crushing, keep the ridge line straight and often include an external baffle and filter. Major shingle makers offer vents designed to go with their shingle systems.
Rolled vents
A flexible mat of fibers or plastic mesh supplied on a roll. Faster to install and follows uneven ridges, but overdriven nails can crush it, which reduces airflow and leaves a wavy ridge.
Exposed metal ridge vents
Aluminum vents with louvered sides, found on many homes built in past decades. They work, but they can whistle in wind, dent in hail and look dated, so they are usually replaced with a shingle-over vent during a reroof.
Metal roof ridge vents
A formed metal ridge cap over vented closures that match the panel profile.
Choosing
- Match the vent to the shingle manufacturer's system, especially for an enhanced warranty.
- Compare net free area per linear foot.
- Prefer an external baffle and filter for Georgia's wind-driven rain.
- Confirm the vent is rated for your roof pitch.
- Replace an old exposed metal vent rather than shingling over it.
See ridge vent vs box vents and roofing warranties explained.