Whether commercial or residential, roofs are the most important component of a construction process. Their main role is to protect the objects and the people inside the structure from the environment outdoor. Although they share a lot of similarities, there are certain major key differences that make them differ from each other to some extent.

Flat roofs costs also differ quite a bit from residential roofs for a number of reasons:

  • The tools required for the job are more complex and expensive to use.
  • Equipment required for the job is of high-quality which means initial investment.
  • Installation requires additional skilled labor.
  • Flat roofs are designed with built-in, complex drainage systems.
  • Flat roofs are often built with additional structural integrated, like HVAC units and ventilation systems.

Due to all these considerations, it is crucial to pick a professional roof contractor like Amos Exteriors for replacing or repairing your commercial flat roof.

Maintenance of Commercial Flat Roofs

Flat roofs must be inspected seasonally as there are many problems that can arise. These include clogged drains, flash repair, seam separations, pounding water and cracking of the roofs.

Types of Commercial Flat Roofs

Thermoplastic polyolefin (TPO) – TPO has become one of the most popular choices for commercial roofing, due to its leak resistant quality. It is thick, cheap and also UV resistant. These roofs are made from low-temperature flexibility and a high-temperature tolerance material which secures them from ozone and different chemical reactions.


  • One of the most economical options for commercial buildings.

  • Water leak resistant, due to the heat-welded seams.

  • Helps reduce the heat build-up, due to its white color it reflect all the sun rays.

  • The installation is easy and can be done in multiple ways.

  • It is also resistant to corrosion breakdown.

  • Algae and other microorganisms are ineffective on the material.

  • Pressure washing isn’t required.


  • Quality of the material may vary from manufacturer to manufacturer.

  • Lamination can expose weak points that can cause shrinkage, cracking, crazing and deterioration if it’s not installed correctly.

  • Width of the TPO rolls is very small.

  • TPO systems are not fire-resistant.

Ethylene propylene diene monomer (EPDM) – EPDM offers unmatched durability and versatility which has made it one of the most widely used materials for commercial roofs. It is the best choice in case of a low-sloped roof.


  • This material is easily installed and repaired as compared to other materials.

  • It is the most inexpensive material for commercial roof available in the market.

  • The roofs are durable and scratch-proof.

  • Due to the light weight of the material, the roof deck doesn’t need to be reinforced.

  • It has a lifespan of up to 20 years.

  • Pretty much protected against UV rays.


  • It’s not the nicest roof, aestheticly.

  • Due to the black color, it absorbs a large amount of heat and can heat up the building in summers,

  • It is available in lighter colors but they can be very expensive.

  • The material is prone to puncturing.

  • The material doesn’t offer complete water resistance.

Spray polyurethane foam – A spray polyurethane foam roof is made out of a plastic that transforms into a solid state from a liquid state in seconds and expands about 30 times as it dries.


  • This material is highly energy efficient and can save your energy bills.

  • The SPF material coating is durable and strong.

  • With a regular maintenance the lifespan of this roof can go up to 40 years.

  • The expanding property helps seal the crack all over the roof.

  • The roof is watertight and airtight.

  • Being light in weight, it provides structural support to the building.

  • Can be repaired easily by just spraying the material in the affected area.


  • A complex method that can only be done by professionals.

  • It is difficult to remove.

Amos Exteriors Are Flat Roof Experts

Whether you need an inspection, a repair, or a full flat roof replacement, contact Amos Exteriors today and we can assist.