Selecting the right roofing type is essential for any commercial building. As the roof protects against the elements, it’s best to choose a material that provides durability, energy efficiency, and manageable maintenance costs. With many options, each with distinct benefits, choosing the most suitable type can be challenging.
This guide outlines five popular types of commercial roofs, which include —single-ply, modified bitumen, metal, green roofs, and mastic asphalt—focusing on the advantages and key considerations for each. By understanding the unique features of these materials, commercial building owners, facilities managers, and construction professionals can make an informed selection with their building’s requirements.
1. Single-Ply Roofing
Single-ply roofing systems are popular for commercial buildings with flat or low-sloped roofs. Made from flexible synthetic materials, such as Thermoplastic Polyolefin (TPO), Ethylene Propylene Diene Monomer (EPDM), or Polyvinyl Chloride (PVC), these roofs are lightweight and easy to install.
Each type of single-ply membrane provides specific benefits, with TPO known for its heat-reflective properties, EPDM for its durability, and PVC for its chemical resistance. Single-ply roofing is especially favoured for retail centres and distribution warehouses due to its efficiency in covering large areas with minimal seams.
Single-ply roofing is valued for its flexibility and suitability in various climates. Its relatively simple installation process can reduce labour costs, making it a practical choice for many commercial settings. These membranes are typically installed in large sheets, minimising seams and improving waterproofing. Depending on the material, single-ply roofs can last anywhere from 15 to 40 years, provided they are well-maintained, making them an attractive long-term option.
Costs for single-ply roofing vary by material. TPO is generally economical, EPDM is valued for weather resistance, and PVC, though pricier, offers superior chemical and fire resistance. Selecting the right material can balance the budget with specific performance needs.
2. Modified Bitumen Roofing
Modified bitumen roofing is a reliable choice for commercial properties, particularly those with low-slope roofs. Comprising multiple layers and a bitumen-based membrane, this roofing system is engineered for strength and durability. The layers are often reinforced with fibreglass or polyester, improving their resistance to tears and weathering, which can be particularly useful in areas prone to severe weather conditions.
One of the main benefits of modified bitumen is its durability and ease of repair. If damaged, individual sections can be patched without significant disruption. Its composition provides excellent waterproofing capabilities, helping to prevent leaks and maintain the integrity of the roof over time. While the installation process can be more labour-intensive than some alternatives, the long-term strength and moderate maintenance requirements make modified bitumen a cost-effective option for many commercial settings.
3. Metal Roofing
While metal roofing gives significant longevity, the installation requires skilled labour and precise techniques to provide proper sealing and structural alignment, which can contribute to higher upfront costs. Typically made from materials like aluminium, steel, or zinc, metal roofs are known for their impressive lifespan, often lasting 40 years or more with proper care. Beyond durability, metal roofing also provides excellent energy efficiency due to its reflective properties, which can help reduce cooling costs by deflecting sunlight. Metal roofs are ideal for industrial factories and manufacturing plants where durability and fire resistance are needed.
Metal roofs are ideal for commercial buildings such as warehouses, factories, and other industrial spaces. They’re highly resistant to fire, wind, and impact, which makes them suitable for areas facing extreme weather. However, installation costs can be higher than some other roofing types, and noise insulation may be needed in certain environments to minimise sound during heavy rainfall.
Overall, metal roofing provides a durable and energy-efficient choice for buildings focused on durability and energy efficiency.
4. Green Roofs
Green roofs, sometimes called living roofs, feature a layer of vegetation planted over a waterproofing system. Green roofs are commonly found on urban office buildings and eco-conscious schools, where their stormwater management and insulation benefits are prioritised. Green roofs offer multiple benefits, including improved insulation, stormwater management, and support for biodiversity. They also help reduce urban heat, making them a practical option for buildings in densely populated areas. Green roof installations also require coordination with structural engineers to confirm the building can safely support the additional weight of soil and vegetation.
A major consideration for green roofs is their weight. Supporting the combined load of soil, plants, and water retention systems demands strong structural integrity to handle the weight safely. Regular maintenance is also essential to provide health to the vegetation and to prevent drainage issues. Green roofs require seasonal pruning, watering in dry spells, and regular drainage inspections for plant health and water management efficiency.
Despite these requirements, green roofs can provide long-term value by lowering energy costs and supporting environmental goals, making them an ideal choice for organisations focused on eco-friendly solutions.
5. Mastic Asphalt Roofing
This waterproofing solution is commonly used on commercial flat roofs, especially in areas requiring a walkable surface. Composed of asphalt mixed with a fine aggregate, this material is spread in layers to create a smooth, highly resistant surface. Its ability to withstand heavy foot traffic makes it suitable for spaces like rooftops used for equipment access or outdoor facilities. This type of roofing is often chosen for healthcare facilities and data centres where walkable surfaces are needed for equipment access. Mastic asphalt can soften under extreme heat, which may make it less suitable for regions with prolonged high temperatures.
One of the standout features of mastic asphalt is its excellent waterproofing capability, which helps prevent leaks and extends the roof’s life, even in challenging weather conditions. While installation requires skilled labour due to the material’s application process, the investment is often justified by its longevity and minimal maintenance. With proper care, mastic asphalt roofs can last for decades, making them a reliable choice for commercial settings focused on durability and weather resistance.
Choosing the ideal commercial roof involves balancing upkeep, eco-conscious objectives, and financial planning. Understanding the unique strengths of each option empowers you to make the best choice for your building. AAC Flat Roofing’s proven expertise in commercial roofing means you’ll receive specific advice and professional installation to meet your specific needs. Contact our team today to discuss your project and discover the ideal roofing solution.
