Underlayment, Drip Edge, Flashing
Once the old roof is removed and the surface is cleaned. The flashings need inspected and in many cases replaced. Any place that a roof meets a wall there will be a flashing. These are usually aluminum or galvanized steel and keeps water from entering your home at the roof and wall joint. The white pipes coming out of your roof are plumbing ventilation and these also need a flashing. These flashings are called pipe boots and are a rubber gasket that seal around the pipes to keep water from entering your home.
The next item is drip edge. It is am L-shaped aluminum that goes around the perimeter of your home. On the eves which are parallel to the ground the drip edge is installed underneath the Ice and Water Shield. On the Rakes which run to the peak of your roof and is installed on top of the underlayment. If either of these sections are not installed properly on your new roof during replacement it creates a high chance of water problems in the future.
Ice and Water Shield is the step once the drip edge is installed along the bottom perimeter of your roof and in the valley. Ice and Water shield is essential on a new roof to protect your home from potential ice dams, and water penetration in the weakest areas.
Once the Ice and Water Shield is installed on your new roof, the next material is Underlayment. Underlayment comes in many forms and from asphalt impregnated roofing felt, to different synthetic underlayments. Each has their benefits and uses where they are essential. Your reliable roofing consultant will go over those options and uses for you.