How to install roof ridge caps

Roof image by Gonçalo Carreira from

The affordability and longevity of asphalt shingles appeal to many homeowners. Asphalt shingles are available in many colours and textures to complement any exterior style or decoration. Shingled roofs are known for their overlapping patterns, which seal out water and wind. Ridge cap shingle placement is the last step of asphalt shingle installation. Cap shingles come in pre-cut squares to properly fit over ridge vents. Proper installation of ridge caps shingles is key to a weather-resistant roof.

Bend a ridge cap shingle over the ridge vent. Begin at the roof end that does not face prevailing winds.

Hammer one roofing nail into each side of the first cap shingle, using nails that are slightly longer than conventional roofing nails. Use the moulded plastic bands on the cap shingle as a guide on nail placement.

Apply a small amount of roofing tar underneath the loose corners of the end shingle with a trowel. Press the corners down to adhere them to the ridge vent.

Overlap the second cap shingle halfway over the first cap shingle. Leave 5 inches of the first cap shingle exposed.

Nail down the second cap shingle with two roofing nails. Hammer the nails into the moulded plastic band on the shingle.

Continue installing each ridge cap shingle according to the process outlined in Steps 4 and 5. Once you reach the end of the ridge, apply a dot of roofing tar underneath the corners of the end cap shingle.

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