It is also important for roofing companies to consider the roof pitch and building codes when helping to determine the shingles to use. There are some areas that have laws that restrict the use of a variety of roof types as well as limited the shingle layers allowed on the roof. When considering the roof pitch, get the angle of the roof. This will help determine the best shingle for each particular house. Qualified roofing companies are able to determine what needs to be done according to building codes and roof pitch.