EPDM (ethylene propylene diene terpolymer) is an extremely durable synthetic rubber roofing membrane. Its superior durability and cost-effectiveness are part of what makes EPDM one of the most popular flat roof systems installed in the U.S. today. This completely weather-resistant membrane is also UV-resistant but due to its dark color it attracts a significant amount of solar radiant heat . This system should be installed with proper insulation between the roof deck and membrane for improved energy performance. EPDM roofs are fully adhered or as many call it glued down. Thanks to its extreme elasticity of more than 500%, it is the most flexible single ply membranes for waterproofing flat roofs, buildings and facades. Average lifespan 50 years+

Modified Bitumen (MB) roofing is an asphalt-based material typically installed in two layers, or 2-ply to give it superior thickness compared to other single-ply membranes. This offer durability for high traffic roofs and comes in narrow roll sizes making it easy to install and perfect for small spaces. However, MB is most popularly known for the black color which absorbs heat. Many manufacturers now offer highly reflective white modified bitumen cap sheets which come close to the reflectivity of white thermoplastics. Modified bitumen plies and seams do not handle standing water as well as their thermoplastic counter-parts. Average lifespan 20 yrs

TPO (thermoplastic polyolefin) is a single-ply roofing membrane and one of the fastest growing commercial roofing systems on the market. The tough, tear-resistant membrane resists chemical spills, oil and grease. TPO roof systems are also UV-resistant to resist cracking and other sun damage, and fully recyclable. As most other systems, an insulation layer installs between the roof decking and TPO membrane. When mechanically attached, TPO sheets are fastened to the decking with plates and seams are hot-air welded. Adhesive backed TPO has a stronger bond to the insulation layer giving it a tighter appearance and superior wind uplift protection. Average lifespan 10-20 years+

PVC (polyvinyl chloride) is ideal for enhancing weatherability, flexibility, and toughness. It is fully recyclable and considered one the highest performance commercial roofing choices, PVC has a variety of products that enhance resistance to punctures, chemicals, pollutants, and abrasions. It is made from a lower percentage of oil and petroleum than TPO or EPDM making it a good choice for applications requiring fire resistance. Installation methods include mechanically or induction fastened for areas with moderate winds and adhered for high-wind areas. Although one of the more expensive options, this material is not suited for cold climates as it becomes brittle and could cause cracking. Average lifespan 15-30 years

Durable metal roofing is a very popular commercial roof type because of its 40 to 60 year lifespan. There are several different types of metal roofing systems available, and some even come with integrated solar or integrated snow removal systems. Metal roofing can have an attractive, finished look, high fire resistance ratings and are stronger and more sustainable than many other options. Metal is susceptible to corrosion and should have protective surface layers added to manage damage from exposure, moisture and pollution. Common metal commercial roofing materials include: Corrugated galvanized steel, Aluminum, Zinc, Tin, Tile Sheets, Copper, Aluminum, Coated or Stainless Steel. Average lifespan 40-60 years

Elastomeric roof coatings can be applied over new roofs to provide an extra layer of weatherproofing, or they can be applied to older roofs to seal leaks, reinforce the roof's integrity, and extend lifecycle expectancy. Core samples of old roofs should be taken to rule out moisture issues that lead to mold.

The three most popular spray-on coatings are:

Acrylic – water-based coating that can only be applied to sloped roofs. due to reversion. Although affordable, 50% of acrylic is lost through evaporation requiring more product to account for evaporation loss.

Silicone – resin-based coating great for flat roofs due to standing water resistance. Performance and price is moderate with twice the resistant to weathering than acrylics.

Urethane – urethanes have the most impact resistance of any elastomeric roof coating but do not hold up to standing water very well and are most costly of the three options.