If you are building a new home, office, replacing a roof, etc.. There is a good possibility that you will be installing an asphalt shingle roof. When considering the skills and the costs involved, you may want to know how a shingle roof system works.
All shingle roofs will start with some kind of decking as the base for the roof. It will typically be OSB or plywood, and several thicknesses are commonly used in different areas of the country. Either you will start off at this point on a new roof with the roofing that needs to be done, or you will have to tear off the old shingles and underlayment before continuing with the project.
After you have bare decking to start installing your roof on. You will start by applying a sticky roofing membrane called ice and water shield, to all of the valley areas, and around