What Is a Ridge Cap? The ridge cap is where the two sides of your roof meet at the top of your home. It's essentially a large seam and it's a vulnerable part of your roof that is susceptible to leaks and damage.

Normal range: $200 - $750. Replacing your home's roof ridge cap costs $475 on average, or between $200 and $750 , depending primarily on length and materials. If you're replacing your roof's ridge cap materials, you can expect installation prices of around $475 , with costs commonly ranging from $200 to $750 or more.

The cap sheet covers and protects the layers below it, helping to extend the life of the roof. Photo courtesy of CertainTeed. A cap sheet is created from several layers of materials including asphalt or tar-coated layers of fiberglass. It is often coated with some type of mineral granules for strength and durability.

Typically, well-installed and properly maintained ridge capping can last anywhere from 10 to 30 years. The longevity of ridge capping also depends on the type of material used. For example, cement mortar ridge capping tends to last longer than plastic or metal ridge capping.