Commercial flat roofing is one of the most versatile roofing options in modern architecture, providing durability, energy efficiency, and unmatched cost-effectiveness for commercial buildings. Commercial building owners need to understand the basics of these commercial flat roofing systems in order to make the best choice for their needs. This guide will break down all of the essentials of commercial flat roofs, including the different types of commercial flat roofing systems as well as the materials and costs associated.
What Is Commercial Flat Roofing?
A commercial flat roof is a roof with a low slope, typically less than 10 degrees, found on commercial and industrial buildings. These roofs are popular due to their versatility, allowing for the installation of HVAC systems, solar panels, and even green roofing systems on top. Flat roofs also offer energy-efficient solutions, contributing to lower cooling costs for commercial buildings with the right selection of materials and an experienced installation crew.
Most importantly, commercial flat roof systems are cost-effective—far more cost-effective than constructing a peaked roofing system and covering it with traditional roofing materials. They’re also long-lasting and easy to repair, making them a favorite commercial building roofing option.
Common Commercial Flat Roofing Systems
The following will break down the commercial flat roof types that property owners can choose from for their buildings. It’s important to understand each types to make the best decision for your building.
1. Built-Up Roofing (BUR)
Built-up roofing is a traditional system consisting of layers of roofing felts, fabrics, and asphalt. These layers create a durable and water-resistant roof surface. BUR roofing systems have been around for many years, and they’re durable and able to withstand foot traffic. These systems are also excellent insulators, but they’re heavy and require a lot of materials.
2. Modified Bitumen
Modified bitumen roofing systems are made from asphalt and polymerized rubber or plastic, and they’re much easier to install than BURs. They’re durable and flexible, making them resistant to cold weather, heat, thermal shock, and ultraviolet light. Heat welding or adhesives are typically used for installation, and maintenance and repair are simple and cost-effective.
3. Single-Ply Roofing Systems
These systems use single-ply membranes such as TPO (thermoplastic polyolefin), PVC (polyvinyl chloride), and EPDM (synthetic rubber). Single-ply systems are lightweight, energy-efficient, and relatively low maintenance. They install quickly and are generally very durable. Depending on the material and color chosen, they can also improve the building’s energy efficiency. It’s also worth noting that many materials, including TPO and PVC, are largely recyclable.
4. Metal Roof Systems
Metal panels, often made of aluminum or steel, are another option for flat roofing. Metal roof systems are known for their longevity and durability, being able to withstand harsh weather conditions, including wind exposure, high and low temperatures, and even impacts. They’re corrosion resistant, as well. They’re quite expensive, but they’re known to last significantly longer than other roofing systems.
Materials Used in Commercial Flat Roofing
Flat roof systems require specific materials in order to create a waterproof barrier that protects the building from the elements. The following are some of the most common materials used for flat roof systems.
Durable Roofing Membranes
Materials like PVC, TPO, and EPDM are popular for their flexibility, energy efficiency, and low maintenance needs. These membranes are typically installed using adhesives or mechanical fasteners. They’re easy to install, coming in easily manageable strips that unroll onto the surface and then seal to one another with adhesives or heat.
Metal Roofing Materials
Metal roofs, including metal panel roofs, offer high durability and are often used in commercial and industrial buildings. They provide excellent protection against moisture and building stress. They’re extremely long-lasting and are entirely recyclable, making them a great choice for eco-conscious building owners.
Insulation Layers
Insulation is a key component of flat roof systems, improving energy efficiency and reducing cooling costs. Proper insulation minimizes heat transfer and allows the building’s mechanical systems to work more efficiently. Common materials include expanded polystyrene, extruded polystyrene, and polyisocyanurate, each of which offers moisture resistance and thermal performance.
4 Advantages of Commercial Flat Roofing
Flat roofs might not be as aesthetically pleasing as a pitched roof, but they have many benefits over traditional roofing systems. Here are some of the most significant benefits.
- Cost-Effectiveness: Flat roofing systems are much less expensive compared to pitched roofs over large buildings, due to requiring much less framework and materials in their construction.
- Energy Efficiency: Flat roofs can reflect sunlight, reducing heat absorption and lowering cooling costs. Materials like TPO and PVC are particularly effective for energy-efficient installations, as they’re widely available in brighter colors that are effective at reflecting sunlight.
- Versatility Flat: Provide usable space for HVAC units, solar panels, or recreational areas. They are especially useful for commercial buildings requiring additional functional roof space, or for installing green roofs, which reduce a building’s carbon footprint.
- Durability: When properly maintained, flat roofs can last decades. Materials like modified bitumen and metal roofing ensure long-term protection against weather and wear.
Costs of Commercial Flat Roofing
The breaking down of the cost of a commercial flat roofing project is multi-layered. It varies depending on factors like the roofing materials, system complexity, and costs can vary.
Additional factors, such as labor costs, roof deck preparation, and roof surface repairs, can influence the total cost. Opting for high-quality materials and hiring professional roofing experts ensures the longevity of your flat roof system and allows you to get the most for your investment.
Maintenance Tips for Flat Roofs
A flat roof can last 20 to 50 years,depending on type and if they’re properly maintained. The following tips will help commercial property owners extend the life of their roofing systems as long as possible.
Perform Regular Inspections
Perform roof inspections regularly throughout the year. Inspect your flat roof surface for signs of damage, pooling water, or cracks. Identifying issues early can prevent costly repairs. If you’re not confident in your own ability to spot these issues, hire an experienced contractor.
Ensure Proper Drainage
Flat roofs are prone to water pooling. Ensure the drainage system is functioning properly to avoid water damage. Look for signs of pooling, but also ensure that drains, scuppers, and downspouts are clear of debris to ensure that any water accumulating on the roof can run off.
Schedule Regular Maintenance
Regular maintenance, including cleaning and repairing minor damage, extends the lifespan of commercial flat roofs. Flat roofs don’t typically require heavy maintenance, but hiring a contractor to perform both your inspections and maintenance will ensure a commercial flat roofing system works properly for as long as possible.
Consider UV Protection
Using UV-resistant roofing materials or coatings reduces wear from ultraviolet light, improving the roof’s durability. In some cases, a roof coating can be applied to help restore the existing membrane, improve UV resistance, and prevent heat absorption.
Choosing the Best Flat Roof System for Your Building
Selecting the right commercial flat roofing material and system depends on factors like budget, building type, and climate. Here are some factors to consider:
- TPO, EPDM, and PVC Systems are ideal for energy efficiency and chemical resistance. They’re generally on the lower end of the pricing spectrum and have moderately low maintenance needs.
- Metal Roofs are perfect for durability and low maintenance. They’re also recyclable and last a very long time (the longest of roof systems). While maintenance needs are generally minimal, the systems are typically expensive.
- Modified Bitumen, or mod bit, systems are great for flexibility and weather resistance. They’re more expensive than PVC or TPO single-ply systems, but they’re more durable and longer lasting.
Consulting with roofing experts can help you determine the best option for your commercial flat roofing project.
Let TopKey Construction Handle Your Flat Roof Installation
At TopKey Construction, we have years of experience solving our customers’ commercial flat roof needs. We have over 30 years of experience in the roofing industry, meaning we have the ability and knowledge to handle any commercial roofing project, such as a flat roof replacement or installation. If your commercial building’s roof has seen better days, contact TopKey today.