First, a sound structural deck must be in place to support the roof covering. Many times a roof leak occurs due to movement or failure of the roof decking or supports. When replacing an existing roof, it is important to thoroughly inspect the substrate surface for loose nailing, improper joints and connections, or evidence of wood rot or deterioration.
Second, the felt underlayment should be uniform and smooth.
Third in the process is the metal work. Metal drip edge is installed around all perimeter edges. Properly mitered corners and proper lapping is a detail many roofers overlook. We often find backward laps and cut square corners on homes we are called to repair or re-roof. All walls, headwalls and valleys should be metal lined as well.
Fourth, the proper application of shingles requires experience and attention to details. Use of chalk lines to keep courses straight, use of proper starters and cap shingles, installations over valleys, proper number and locations of nails all play a vital part in the integrity of your roof.
Finally, cleaning up and inspecting the work ensures a satisfactory completion for each job.