Whether you are erecting a new home, building an addition to your current home, or remodeling an existing home, a roof is an integral part of what makes a home. The roof protects the structure against all-natural elements. A well-installed roof can add many years of low-maintenance use, increase the marketability of a home, and reduce heating and cooling costs during the seasons when they aren't in use. Most roofs are made with one of three different materials, wood shingles, asphalt shingles, or metal roofs. Each type of roof has advantages and disadvantages depending on where it is located, the amount of snow that the roof will see, and the climate that the roof will be subjected to. If a home has a short history of being exposed to extreme weather, a metal roof may be the best choice for the structure. Metal roofing is fire resistant and weather-resistant and does not need to be replaced as often as other types of roofs. Wood shingles have been used for homes that are subject to extreme temperatures because they provide insulation and protection from the elements when temperatures dip below freezing for extended periods of time. Many architects choose to incorporate a pitch into their roofs so that water runoff doesn't pool underneath the roof. This is usually done by installing a pitched roof or adding a raised plate to the roof so that water runoff is channeled away from the house. Other roofing methods include using valleys to create slopes in roofs, using tiles for different styles, and adding more layers of gravel to create more slopes. Regardless of which type of roofing system is chosen, the roofer should ensure that the roof is level, that pitch is consistent, and that the materials used don't require any maintenance to keep them in good condition.