Getting Started with Shingle Installation

A properly installed shingle roof can protect your home for 20 to 30 years or more. Whether you're a homeowner planning a renovation or a contractor looking to refine your process, understanding the fundamentals is the key to a successful installation.

Preparing the Roof Deck

Before laying a single shingle, the roof deck must be clean, dry, and free of any damaged sheathing. Inspect the plywood or OSB panels and replace any sections that feel soft or show signs of water damage. Next, install a self-adhesive ice and water shield along the eaves and in all valleys — these are the areas most vulnerable to leaks. Cover the remaining deck with roofing felt or synthetic underlayment, overlapping each row by at least two inches.

Laying the Starter Course

The starter course is your first line of defense against wind-driven rain. Apply starter strips along the lower edge of the roof, ensuring they overhang the drip edge by about half an inch. This creates a seal at the bottom where water tends to accumulate.

Installing the Field Shingles

Begin at the bottom edge and work your way up. Align each shingle with the course below and nail it according to the manufacturer's specifications — typically four nails per shingle, placed just above the adhesive strip. Stagger the joints between courses by at least six inches to prevent water from finding a path through the seams. For architectural shingles, follow the pattern recommended by the manufacturer for the best visual result.

Flashing and Ridge Cap

Install step flashing wherever the roof meets a vertical wall, and use valley flashing in any roof valleys. These metal components direct water away from vulnerable intersections. Once all field shingles are in place, cap the ridge with specially designed ridge shingles, overlapping them to shed water down both sides of the roof.

Safety First

Always wear a safety harness secured to a proper anchor point. Use roofing shoes with soft soles for traction, and keep the work area clear of debris. Never work on a wet or icy roof, and take regular breaks to avoid fatigue-related accidents.