Tag Archives: roof types

Types of Roof Systems in Maine

There are two classes of roof systems used today; these are named low slope roofing and steep slope roofing. Low slope roofs are impermeable to water, and are installed at an angle of 14 degrees or less. Steep slope roofs shed water along their coverings, which are installed at an angle greater than 14 degrees.

Types of Roofing MaterialsLow Slope Roofing

 Roofs that are said to be “low slope” are those that are too low to accommodate tiles or shingles, which depend on the slope of the roof for water to drain. Low slope roofs are also commonly called flat roofs. Most of these low slope roofs are comprised of three different parts. The first part is the weatherproof layer, or layers, which is designed to keep out moisture. The second part is the reinforcement layer, which confers stability, strength, and resistance to the roof. The third part is the surfacing, which protects the other layers from the weather and the sun. Depending on your choice of surfacing, this layer may also provide for resistance against hail and fire, and may increase the roof’s ability to reflect rays from the sun – Free Roofing Inspection Estimate Here.

There are a number of materials used in low slope roofing. Built-up roof (BUR) coverings, also known as “hot roofs,” are layers of paper held together with asphalt. There are also other types of multiple layer systems using polymer-modified bitumen sheet membranes. Single layer, or single ply, systems may be called “rubber” roofs, and are made of chemically modified materials assembled and welded together in overlapping layers. In addition, there are roof systems based on spray polyurethane foam, a liquid composed of two different ingredients and applied in varying thicknesses. Structural metal panels may also be used in low slope roofing covering.

Roof Contractors in Maine

Steep Slope Roofing

 Roof systems classified as being “steep slope” are roofs that have individual pieces, such as shingles or tiles, assembled together. There are also three typical components to a steep slope roof. The first component is a roof deck, which provides structure and usually consists of a material based on wood. Following the roof deck is the second component, which is the underlayment. The underlayment provides an additional protective barrier against moisture, and is used as temporary external protection while the top roof covering if being installed. The roof covering is the third component, and functions as the outermost protective material by shedding water along its slope.

Architectural Roofing Shingles In Maine

There are many different custom coverings for steep slope roofs, however, most covering materials fall into one of the following categories. Synthetic coverings are composed mainly of recycled rubber or plastic, and have only been used for the last twenty years. Wood shakes and wood shingles are coverings obtained specifically from redwood, pine, cypress, and western red cedar trees. Slate roofing is a nonabsorbent, natural material. Asphalt shingles are a roofing material produced with organic felt or glass-fiber mat as the key ingredient. Clay tile and concrete tile, and Metal may also be used as covers in steep slope roofing.