Ridge Cap

A ridge cap is a protective covering installed at the peak (ridge) of a roof where two sloping surfaces meet. Typically made from the same material as the roofing — metal, tile, or asphalt — the ridge cap seals this vulnerable junction against rain, snow, and wind. On metal roofs, the ridge cap is a formed metal profile; on tile roofs, it consists of specially shaped ridge tiles bedded in mortar or secured with mechanical fasteners.

The ridge is one of the most exposed points on any roof, subjected to the highest wind loads and maximum weather exposure. A properly installed ridge cap not only prevents water infiltration but also provides ventilation for the attic space through integrated ridge vents, allowing warm, moist air to escape naturally while preventing rain and snow from entering.

Over time, ridge cap fasteners can loosen due to thermal expansion and contraction cycles, and sealants deteriorate under UV exposure. Wind can lift poorly secured ridge caps, and in severe weather, they can be torn off entirely, leaving the ridge line open to water entry. Mortar bedding on tile ridge caps is particularly prone to cracking and crumbling with age.

The ridge cap should be inspected as part of the annual roof check, ideally from a ladder rather than walking on the roof. Look for lifted edges, missing fasteners, cracked sealant, and any daylight visible from the attic at the ridge line. If repairs are needed, they should be performed promptly, as ridge leaks can cause significant damage to the attic structure and insulation below.