Roofing felt is one of the most important roofing materials used today. It is made from asphalt or tar based compounds which can resist extreme weather conditions and provide excellent insulation. This is the reason why it is often used on the exterior of buildings and homes. Also known as roof tar, it can be combined with other materials to create different types of protective coatings such as tar roof coatings, rubber roof coatings, paper roof coatings, flash coating, metal roof coatings, and asphalt roof coatings. These coatings can prevent the buildup of moisture, reduce noise, and add to the aesthetic appeal of the building or home. Roofers usually apply these coatings by driving a machine over the surface to flatten the surface, then applying the liquid coating.
Bitumen roof felt, is widely used on roofs to provide protection against damage, wind, rain, snow, hail, and extreme sunlight. Bitumen is basically a mixture of petroleum and asphalt materials, which are mixed together and dried to form a hard, sturdy emulsion. Bitumen has several advantages over tar paper. It is more waterproof, more durable, and safer for the environment.
Most roofing felt is applied in a single, two-inch thick layer which acts as a protective shield against direct sunlight, rain, snow, hail, and heat. The second layer is commonly applied in two to three coats and provides additional protection against ultra-violet rays. Each layer provides a distinct benefit, which depends on the location and application of the roof. The best layers are made of at least two coats because they provide an increased level of protection. Generally, tar paper is better able to withstand heat than bitumen, which allows thicker layers to be used at a larger extent.
Bitumen roofing consists of a thin layer of tar paper. There is also a second layer of what is commonly known as tar foam which provides additional protection against the sun’s harmful rays. On a typical installation, the tar paper is applied first followed by the fiberglass shingles. Fiberglass shingles are considered the most visually appealing shingles, but also offer the highest R-values. Tar foam is the cheapest and most commonly used shingle type.
Over the years, the need for roofers has decreased and there are now a wide variety of materials available for the roofing industry. However, one of the most important components of any roof is the underlayment or felt layer. This is the layer that protects the roof from the elements, such as moisture, temperature changes, and impacts such as wind, hail, debris, and falling leaves. The importance of choosing the right underlayment or felt is often overlooked and homeowners are not even sure how to go about purchasing the best product for their home.
The main categories of underlayment include Type A, Type B, Type C, Type D, and Type E. The main types of roof felt include Type I, Type II, Type III, Type IV, and Type V. Type I and Type II are the least expensive roof felts while Type III and Type IV are considered to be the highest priced. Lastly, Type D is the most inexpensive and most commonly used type of roof felt.