Torch Down Roofing | A Fiery Roofing Method With Benefits

Norman Roofing • July 10, 2025
A man is using a torch to burn a roll of roofing material on a roof.

If you’ve ever stumbled across a roofing video online or have seen roofers carrying torches, you might be curious as to why this type of equipment is needed for a roofing job. While the fiery flames might catch your attention, torches aren’t just for show; they’re a practical tool that helps roofers to install a specific type of roofing material. In this blog, we’ll explore how torch down roofing works and why it's used in some commercial roofing projects.


So, What Is Torch Down Roofing?


Simply put, torch down roofing is an application method. It’s used to install a roofing system called modified bitumen, which is a flexible material that’s rolled onto the structure. Once in place, a propane torch is used to heat the bottom of the modified bitumen, forcing it to melt and adhere to the underlying structure. This method ensures that the modified bitumen forms a watertight seal, which lowers the likelihood of leaks appearing within the roofing structure. 


Is Torch Down Roofing Used for Other Roofing Systems?


While torch down roofing can be used to apply single-ply membranes, this is not typically done.  This method is used specifically for modified bitumen as it requires intense heat to properly bond to the roofing structure. If you see a roofer using the torch down method, it’s more than likely that they’re working with modified bitumen. 


Why Does Modified Bitumen Require Intense Heat?


This method is primarily used because modified bitumen is made from a mixture of asphalt and polymer (which can be either plastic or rubber.) This unique combination requires intense heat to form a solid seal between the material and the roofing structure. Without sufficient heat, the seams may not seal correctly, leading to potential leaks and system failure.

A man is kneeling down on a roof with a roll of roofing material.

Is This Method Dangerous?


Yes, this method can be quite dangerous, especially if someone isn’t trained to handle the equipment. If not used with caution, an open torch can result in burns or start fires if it’s placed too close to other materials. Plus, these roofing types can release volatile organic compounds (VOCs.) If inhaled, these chemicals can negatively impact your respiratory system. 


Modified Bitumen as a Roofing Material


While the installation process requires skilled labor and protective equipment, modified bitumen is still a viable roofing option. It’s an incredibly durable material that forms a watertight seal, which is ideal for low-slope roofs that are vulnerable to pooling. 


Additionally, this roofing material is able to withstand a range of conditions, including:

  • Intense heat – Modified bitumen maintains its integrity in high temperatures, making it ideal for hot climates.
  • UV rays – Its UV-resistant surface helps prevent degradation from constant sun exposure.
  • Heavy rainfall – The waterproof layers create a strong barrier that keeps moisture out, even during intense storms.
  • Strong winds – When properly installed, it adheres tightly to the roof deck, resisting wind uplift and damage.
  • Humidity – Its moisture-resistant properties reduce the likelihood that mold and mildew will develop.
  • Punctures – Modified bitumen is less likely to be punctured due to its thick, reinforced layers.


While more precaution is required during installation, skilled roofers are able to successfully install modified bitumen, albeit at a higher cost. For some businesses, the higher price point is justified by its immense protection against weather and heat. 


If you’re considering modified bitumen as your next roofing material, it’s advised that you do some research to see if the material is the right fit for your business. Other roofing options similar to modified bitumen include TPO, PVC and EDPM. 


Before you make any decisions, it’s always recommended to seek advice from a professional roofer. They can access your current roof and determine if modified bitumen is the right fit for your roofing project.


Looking for Experienced Roofers? Give Norman Roofing a Call Today!


Need expert roofing services? Contact the pros at Norman Roofing today! Located in Meridian, we’ve been serving communities across Mississippi and Alabama for 48 years. 


We not only perform commercial and industrial roof installations, but we also offer emergency roofing services and metal roofing services. If you're ready to work with a team that values quality craftsmanship, give us a call at 601-483-4079. To learn more about our roofing options, visit our website by clicking the link here. 


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