San Antonio Roofing: Article About Flat Roof Material
While sloped roofs are without a doubt the most common type among residential construction projects, flat roofs are used from time to time for aesthetic purposes. They are also common on carports. For commercial applications, flat roofs are much more widely used. In fact, for larger buildings, they are the only type that is feasible. A variety of material types are commonly used, and each one has its own advantages and disadvantages. The professionals at San Antonio Roofing can provide more detail to individuals who are considering installing or repairing a flat roof.
Built-up roofs are so named because they contain several layers of roofing material. Typically, they are made by spreading tar and gravel over a waterproof substance and then repeating the process to make at least three layers. The layers are often topped off with smooth river stone. One reason many builders choose this type of roof is appearance. If another part of the structure overlooks a flat roof, the stone topping can be considered part of the décor. This type of roof is also one of the cheaper types. The weight of the roofing material can be a disadvantage due to the need for stronger structural components.
Have a question regarding residential roofing or roof repairs? Please ask any of the expert roofers from Tony's Roofing of San Antonio.
Rubber roofing membrane material is usually made from ethylene propylene diene monomer (EPDM), which is engineered to resist sunlight. Like built-up roofs, the membranes can be covered with stone. EPDM is resistant to tears but is more susceptible to punctures than other types. For owners who want to stay away from the standard black color, EPDM is available in other colors for an additional cost. However, the extra cost of a lighter color may be economically feasible in hotter climates where black roofs will result in higher cooling costs.
Polyvinyl Chloride (PVC), commonly referred to as vinyl in the roofing industry, is a popular alternative to rubber membranes. Heat-welded seams form a watertight bond between adjacent sections of vinyl. PVC has increased in popularity because of its inherently lighter color. This is primarily for energy consumption purposes. It is also engineered to maintain its flexibility over its entire lifetime.
Modified bitumen roofs are made from asphalt that has additives to give it a rubber-like consistency. Today's material can be purchased in rolls for ease of installation and comes in peel and stick form. This material can also be placed over built-up roofing material to make a type of hybrid system. A disadvantage is that the material is not as resistant to scuffs and tears as other types. It is about mid-level in terms of cost.