Do you need ridge vent end plugs, and how do you add them to an existing ridge?
Short answer. Yes. An end plug, or end closure, seals the open end of a ridge vent so rain, wasps, birds and bats cannot get in where the vent stops; many rigid vents have them molded in, while rolled vents and older aluminum vents need separate closures. Adding one to an existing ridge usually means lifting or replacing the last cap shingle, fitting the plug, and nailing a new cap over it.
Built-in vs separate
- Rigid plastic vents: many have end plugs molded in or knock out panels that the installer leaves in place on the first and last section.
- Rolled vents: the cut end may need its own closure or a specific finishing method from the instructions.
- Aluminum ridge vents: use separate end caps or plugs sized to the vent profile.
Signs an end plug is missing or failed
- A dark opening at the ridge end, visible with binoculars from the side of the house.
- Wasps or birds coming and going at the peak.
- Stains at the top of the gable wall in the attic after windy storms.
Retrofitting one
- Make sure any animals are out. Bats and birds often require timing and methods a wildlife professional should handle.
- Remove the end cap shingle carefully, or plan to replace it.
- Fit the correct plug for the vent, or replace the last section with one that has a molded plug.
- Nail a new cap over the end, face nail it and seal the nail heads.
What not to use
- Expanding spray foam, which degrades in sun and blocks airflow.
- Steel wool, which rusts and stains the roof.
Check the whole ridge too; if the end cap was loose, short nails may affect the run. See wind damage to roofs in Georgia and ridge vent vs box vents.