The answer to 'how often to replace ridge vent' is that ridge vents typically need to be replaced every 15-20 years. Ridge vents are an important part of a home's roof ventilation system, helping to regulate attic temperature and humidity. Over time, the materials in ridge vents can deteriorate due to exposure to the elements, leading to leaks and reduced effectiveness.
It's generally recommended to have a professional roofing contractor inspect your ridge vents every 5-7 years and replace them if they show significant signs of wear and tear, such as cracking, warping, or deterioration of the sealants. Replacing the ridge vents can help extend the life of your roof and ensure your home's ventilation system is working efficiently.