shingling

Shingling is the process of covering a surface, especially a roof, with individual elements called shingles, laid in overlapping courses to shed water. Installation begins at the eave line with a starter course, and successive rows are installed toward the ridge. The underlying layer, or underlayment, provides additional weather resistance, and flashing is used at roof penetrations and edges to prevent water intrusion. A properly shingled roof also requires adequate ventilation and a suitable slope to ensure drainage.

Common materials include asphalt shingles, wood shingles or shakes, slate, metal, and composite or synthetic shingles. Asphalt shingles are the most widely used in many regions because of cost and ease of installation. Wood shingles offer a natural appearance but require maintenance. Slate and metal shingles are durable but higher in upfront cost. The choice of material influences appearance, durability, weight, and wind resistance. Lifespans vary: asphalt typically 15–30 years, wood 20–40, slate 50–100, metal 40–70, depending on climate and installation.

Installation requires attention to starter strips, proper nailing, and spacing to prevent leaks and blow-off. Flashings at valleys and penetrations must be kept intact. On low-slope roofs, additional underlayment or membranes may be required. Regular maintenance involves inspecting for curling or cupping, missing granules (in asphalt), algae growth, and damaged shingles; prompt replacement is advised to avoid leaks.