Flat roofs are used everywhere and are the most popular choice for commercial, industrial, and institutional buildings. However, they have a reputation for frequent repairs and common issues such as leaks. Hence, it becomes very important to choose the right material for your flat roof. To do this, the first thing you need to do is understand the roof materials available.
Though there are several materials available, in this blog, we have mentioned the seven best materials for a flat roof.
7 Best Flat Roof Materials
Here are the best flat roof materials available:
Built-Up Roofing (BUR)
If you are struggling with a low-pitch roof problem, built-up roofing is the solution. It consists of layers of bitumen and reinforcing fabric, which creates a durable and waterproof layer. It is installed using several layers of asphalt-filled roofing felt embedded in bitumen.
It then blends with hot-applied asphalt or coal tar pitch. Thus forming a monolithic roof membrane. The process is repeated to achieve 2-4 thick piles. The top layer is usually covered with finely crushed stone grains, which protects the roof membrane from harsh weather conditions. They're fire-resistant, durable and give an aesthetically pleasing appearance at a low cost.
Standing Seam Metal Roof
A standing seam metal roof is a set of metal panels locked together and seamed mechanically with concealed fasteners. It is available in several color options and is more durable. Hence, when compared to membrane roofing material, standing seam metal roofs are considered better. The seaming allows it to expand and contract as per the change in climate. The most common metals used for this roof are copper, stainless steel, and aluminum.
If you want it to last for more than 30 years, ensure that it is properly installed with the help of a professional. If maintained adequately, its lifespan can go up to 50 years. Seam metal roofs are costly, but they are worth the investment. But they are not the right fit for roofs with no pitch. This is because it can cause leaks when water starts pooling.
Modified Bitumen Roof (MBR)
Modified Bitumen Roof is a type of roofing made from asphalt treated with certain chemicals. This makes it durable and waterproof, which improves its efficiency. It is also flexible, like synthetic materials. It consists of multiple layers, such as a base sheet, a cap sheet, and one or more ply sheets.
Modified Bitumen Roof is lightweight and can be easily installed. Also, it offers excellent thermal resistance because of its reflective surface. Though they're cost-effective, they need more maintenance and are less resistant to wear and tear.
Single Layer Membrane Roofing
Single-layer membrane roofing is mostly used for commercial and residential roofs. They have a white single-ply membrane, which doesn't absorb heat, which keeps the home cooler, even during scorching summer heat. They are also known as an elastomeric roof membrane and are available in different varieties, such as:
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PVC (Polyvinyl Chloride)
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Neoprene (Polychloroprene)
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TPO (Thermoplastic Polyolefin)
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EPDM (Ethylene Propylene Diene Monomer)
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CSPE (Chlorinated Polyethylene And Chlorosulfonated Polyethylene Sheets)
Out of all these, EPDM is considered the best. TPO is also a popular choice because of the three layers, consisting of a TPO polymer base, a polyester-reinforced scrim, and a TPO compounded top ply. As they are made of fiber or polymer, they are flexible and can handle temperature fluctuations and some minor impacts. These roofs can be installed with the help of fasteners, adhesives, and heat welding.
Spray Roofing
Spray roofing is becoming popular because of its easy application and wide coverage. They're also known as Liquid Roofing and are made up of aluminum, silicone, or acrylic. Professionals spray this material directly on the insulation to prevent heat loss.
It creates a waterproof, UV, and fire-resistant layer when sprayed. However they are costly and require professional experience in spraying this roofing liquid.
Green Roofing
Green roofing usually includes plants, soil, and a drainage system installed over PVC, TPO, etc. This adds a touch of greenery, reduces stormwater runoff, improves air quality, and provides insulation. However, it requires specialized installation and timely maintenance to ensure it's aesthetically pleasing.
In addition, they might not be the right choice for all climate or building types. Hence, always talk to a professional roofer in your region before deciding on green roofing.
Concrete Roofing
The concrete roof has no seams, which means there are no weak points that may lead to leaks. They are highly durable and can withstand high winds, insect damage, rot, intense hail, and fire. The roof is installed by pouring concrete into molds on the rooftop. This creates a seamless and smooth surface.
Though they can last for more than 50 years, the concrete is porous and might absorb moisture. This may cause problems such as blisters.
Is It Possible to Have a Flat Roof With Shingles?
Shingles on a flat roof are not recommended. A few sealing points will reduce the potential for leakage. Hence, it is advisable to have a large square roof or single sheets of materials. Sometimes, homeowners also opt for a self-adhering membrane roof system. They offer multi-layer protection of a membrane roof, along with the traditional granule look of a shingled or built-up roof.
They are also durable and offer complete protection against snow, ice, and other weather elements and can handle foot traffic. They're easy to peel and stick and are available in single, double, and triple-layer reinforcement. Thus, they are a popular choice for residential roofing with at least a 1:12 slope.
How Much Does a New Flat Roof Cost?
When deciding on the exact price of a new flat roof, several factors should be taken into consideration. Materials also play a significant role in deciding the flat roof price. Prices mostly range from $4 - $13 per square foot. Here are the average costs of flat roof materials -
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Built-Up Roof - $4 - $10
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Standing Seam Metal Roof - $15 approximately (for galvanized steel)
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Modified Bitumen Roofing - $4 - $8
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Single Layer Membrane Roofing - $4.25 - $12
Conclusion
It is important to choose the right roofing material to enhance the durability and aesthetic of your home's exterior. However, choosing the right material depends on several factors, such as budget, climate, building use, etc. So, be sure to talk to a roofer in your area. They can help you get the best material in your budget.
