When adding on to an existing structure, identifying the style of your existing roof will help keep the addition uniform. Depending upon the type of roof on your home, you may be limited to certain materials. There are several common types of roof, each with their own appeal. Steep sloped roofs also support the widest range of materials. Ranging from a 4:12 to 21:12 pitch, steep slope roofs offer the least amount of headroom, but provide maximum water runoff. Shed roofs, while flat, classify as low slope roofs. These roofs provide better drainage at the cost of some headroom in your loft area. Roofs with a pitch between 2:12 and 4:12 classify as low slope. ![]() However, flat roofs typically cost less than some other roof types. Drainage is less efficient on this type of roof, and there may be local regulations addressing this problem. The space underneath a flat roof has mostly uniform headroom, making it good for garages and modern apartments. Flat RoofsĪny roof with a pitch under 2:12 is considered a flat roof. Each slope category has its own advantages and disadvantages, so it is best to consider these factors when planning to build a roof. Also known as a slope, there are three different classifications into which roofs are divided. The pitch of your roof plays a major role in the available styles and materials. There may be local restrictions preventing you from using certain types of roof or material, so it is best to research building codes if you are not using choices common in your area. When selecting your materials, you may choose to go with a more eco-friendly or cost-effective alternative to your existing roof material. Regardless of whether you are repairing a roof, replacing it, or building an addition to your home, it is important to know the choices available to you as materials are often limited to certain types of roof. Now, homeowners have a wide range of options for both style and material when working on their roof. There was a time when homes were uniform in design and had limited access to materials. Best Lawn Care Service for Service Dogs.Lighted Magnifying Glass That Stays Put.There is a limited installation window for this type of system and the risk of overspray during application is cause for concern.įor information on other materials commonly used in flat roof systems, click here. Proper installation requires a great deal of technical knowledge and experience. When it comes to spray foam roofing systems, not all contractors are created equal. In fact, SPF systems are proven to increase the structural integrity of commercial buildings. Spray foam is an incredibly strong material. They serve as an excellent insulation barrier for low-slope flat roofs and provide superior energy efficiency and thermal resistance (R-value). ![]() This type of roof combines closed-cell, plural-component, spray polyurethane foam (SPF) insulation with a protective elastomeric top-coating.Ī properly maintained SPF roof can last over 50 years. While not nearly as common as the options mentioned above, spray polyurethane foam is probably one of the most effective flat roofing systems available. Recommended reading: The Ultimate Guide to TPO Roofing It’s also worth mentioning that there is a real concern over quality variations of TPO membranes from one manufacturer to the next. TPO has only been around since the early ’90s, so little is known about the long-term effects this system provides. It’s less expensive than PVC and is relatively easy to install and maintain. TPO (thermoplastic polyolefin) is a flexible material that lasts anywhere from 10-25 years. It’s water and fire-resistant, and it’s also rated to withstand heavy winds, but this type of system generally costs more and has weaker puncture resistance than EPDM or TPO. PVC (polyvinyl chloride) is a durable roofing product with a lifespan of about 20 years. Both are white, heat-welded, thermoplastic roofing systems, but that’s mostly where the similarities end. These two materials look almost identical-so much so that it can be difficult to tell them apart. Over the past few decades, single-ply membranes such as PVC and TPO have become a lot more common on commercial flat roofs.
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