The construction of a new roof is a complex process. Different types of roofs require different methods of measurement. Gable roofs are fairly simple to measure, while mansard or gambrel roofs are much more complicated. As a result, waste becomes an issue, especially if shingles need to be cut to fit tightly into tight spaces or nailed to the roof deck in even rows. Fortunately, the phrase “roof square” helps bridge the gap between the two types of roofs.
Another option for replacing a roof is reroofing. Known as an overlay, reroofing involves installing a new roof over the top of the existing one. It saves time and money, as there is no need to tear off the old roof. This option, however, is best for houses that do not need a complete roof replacement. However, reroofing is not recommended if the damage is too extensive, as it may result in the roof being too heavy and the need for additional layers.
Rolling roofing is a common method for low-slope residential roofs. It typically costs between $1.50 and $2 per square foot and lasts for about 10 years. Built-up roofing is one of the oldest methods of flat roofing, consisting of several layers of roofing felt, which are impregnated with asphalt and applied in overlapping layers. Once rolled-up roofing has dried, finely crushed stone is embedded in the hot tar, forming a very durable roof.