Of the different types of roofs for commercial buildings, flat roofs are among the most common. These roofs are easy to work on and maintain, and you get a choice of different types of materials for the roof. The following four roofing materials are ideal for a flat roof:

Built-Up Roof

A built-up roof (BUR), also called a tar roof, is made up of layers of asphalt felt. On top of these asphalt layers, you will find a layer of liquid asphalt or coal tar, hence the name. On many of the BUR roofs, there is also a final layer of gravel to provide protection from UV rays. Both tar and asphalt have a tendency to get very hot, which may increase the temperature inside your building in the spring and summer months. The gravel can provide n extra barrier between the sun and the inside of your building.

Spray-On Roof

For a more cost-friendly alternative, you can get a spray-on flat roof. This includes two parts, with the first part being spray insulation that is sprayed right onto the roof's surface. After the spray foam, there is a layer of either acrylic coating or urethane added. There may also be a third layer of gravel or sand added to provide additional protection of the roof, both to block the sun's UV rays and to offer a waterproof barrier for your roof.

Singly-Ply Membrane

If you want a lighter roofing material for your flat roof, you can choose the single-ply roof. The single-ply roof uses one layer of weatherproofing membrane that is attached to the roof structure with barbed plates or glue. This is a very common peel-and-stick roof for businesses, as well as some residences.

If you want a DIY type of roof that you can install on your own, this is the easiest roof to choose from. Popular materials for a single-ply membrane roof include poly-vinyl chloride (PVC), rubber, and thermoplastic polyolefin (TPO).

Modified Bitumen

The last type of roofing material to consider for your flat roof is called modified bitumen. This is another single-ply roof, but it has a lighter surface that can actually help reflect heat and reduce your energy bills. Modified bitumen has a surface that is mineral-based and includes a torch-down system to work as adhesive for rolling the roof and installing it.

It is even easier than other types of peel-and-stick roof materials. While it is easy to install, it is not recommended for retail stores or businesses that are occupied for a large portion of the day. This is better for a commercial building used for storage or a warehouse. To learn more, contact a company like Conrad Roofing Of Illinois with any questions you have.