Pro’s Corner: An Overview Of The Industry’s Best Commercial Roofing Systems And Materials

Look at any downtown district in Boise, Nampa, Caldwell, or any city in the country. From a 50,000 sq. ft. warehouse to a 5,000 sq. ft. retail store, you’ll see TPO single-ply, modified bitumen, metal roofing, and several other types of roofing systems — all of which include their own respective material.

So, saying there is a blanket “best” roofing system or material would be misguided. The roofing systems and materials are most suitable for your business and local climate needs should be carefully considered. For instance, some businesses will need their roof to handle massive HVAC units if they are combatting sweltering heat. Others may want maximum energy efficiency to help the environment and their budget.

Whatever your reasons, picking the correct commercial roofing system for your business’ operational and structural integrity is critical for giving you peace of mind for the next 20+ years. Becoming familiar with the elements of a commercial roofing system is the first step, however you’ll also want to speak with experienced commercial roofing contractors who can further help you make a sound decision on this complicated process.

Common Roofing Types and Systems

Before we dive into materials, it helps to know the roofing construction types. This can narrow down your options right off the bat.

You typically have two roofing pitches for commercial buildings:

1. Low slope (flat roof): This is a popular option, especially for warehouse-type buildings, because it allows for the convenience of mounting equipment when there is no room on the property. Materials accompanying this type of roof are often TPO, EPDM, and PVC.
2. Steep slope: Most associated with residential buildings, some businesses opt for gable or hip roofs. Metal and shingles are common materials for this roof construction.

After deciding what pitch your building has or will have, the next choice is which roofing system will be best. Here, you’ll consider decking, outer membrane, and roof covering material. There are four standard roofing systems:

1. Single-ply membrane systems: These systems waterproof the roof using one layer of synthetic material—usually TPO, EPDM, or PVC — over the roof deck. These materials are flexible and durable, so the roof is equipped for foot traffic.
2. Built-up roofing (BUR): Here, the goal is to alternate layers of asphalt tar and fiberglass, using 4 – 6 layers for insulation and durability. Generally, a top layer of gravel is used to protect everything below.
3. Modified Bitumen: Layers of asphalt combined with a polymer (rubber) are applied in sheets, mopped on, or torch or cold applied for a roof to handle high and low temperatures without cracking.
4. Metal Systems: These are installed if you want an aesthetically pleasing roof that is also built for longevity. While they have a higher up-front cost, they tend to outlast other systems. Lastly, metal roofs are low maintenance and energy-efficient. Metals can include steel, aluminum, and copper.

As you can see, there are many materials used in a roof. However, your choice in the “best” material for your roof will depend on the system.

Making Smart Roofing Decisions

Whether you are creating a business building via new construction or considering an existing structure, your selection process for one roofing system over another will essentially come down to four factors:

1. Climate impact: Rain, snow, heat, freezing, and thawing can quickly degrade the wrong material. You’ll want to consider your climate before you make a decision on the roof system and material. Metal can shed snow but would corrode in coastal environments, while modified bitumen offers cold flexibility. TPO and EPDM are great UV-resistant options.
2. Cost: You’ll need to factor in several points for cost — durability, energy savings, and life expectancy. For instance, metal is eco-friendly and durable but costs more upfront. TPO and EPDM are relatively cheap and are durable. Regular maintenance will also have to be considered here.
3. Installation time: If you are in a time constraint, or need to factor labor into your budget, you need to think about how much time it’s going to take to complete your roof. Single-ply membranes (TPO and EPDM) finish in days. Built-up and modified bitumen systems will take longer and require certain weather conditions.
4. Maintenance: Every roof will need care. How much care will depend on your climate and material; however, you should get your roof inspected periodically — which, again, will come down to material and climate. For instance, in the right environment, metal might only need to be inspected annually, single-ply roofs will require periodic seam checks, and built-up systems will need gravel redistribution. Maintenance is one thing, and repairs are another. If you don’t get your roof inspected in time, small problems can become large ones, such as a small leak resulting in mold in your house.

After evaluating these factors for your building’s needs, you can begin to get a better feel for choosing the right commercial roofing system. You’ll also understand that there is no “best” material but that certain materials perform best given the conditions they are in.

Understanding roofing types, systems, and materials ensures your return on investment for years to come. It helps to know that TPO is budget-friendly for your office, while PVC’s chemical resistance can handle a restaurant kitchen’s exhaust demands. If you are roofing a huge warehouse, a built-up system’s durability may be best. Additionally, a sleek metal roof for your retail business might bring people in on sheer curb appeal.

There are variants and alterations to these systems, but when it boils down to it, the common systems are common for a reason — there is an option that protects most types of structure when placed in an accommodating environment. However, if your deciding factors are unique, you should explore these variants for a roof that will accommodate your business and climate needs.

Your success will lie in understanding your specific needs, local climate, cost, maintenance, and capabilities. Of course, you should always consult a qualified roofing company with knowledgeable contractors. They will help translate these choices into real-world performance, further helping your decision.

Lastly, a smart commercial roofing choice will involve immediate demands with long-term planning. Your roof can do more than protect your building and assets; it can reduce energy bills and operations costs and keep you comfortable year after year.