How To Install Torch Down Roofing: Step By Step Guide

How To Install Torch Down Roofing

What is Torch Down Roofing?

Torch-down roofing is a well-known method of roofing famous in commercial and residential building construction. It is also known as modified bitumen roofing. It consists of multiple layers of fiberglass or polyester reinforcement fabric coated with bitumen (asphalt) and surfaced with mineral granules.

Types of Torch Down Roofing

There are two main types of Torch-down roofing:

 APP stands for (atactic polypropylene) Two two-layer torch-down system and the second is  SBS (styrene-butadiene-styrene)Three layer system. Both types have their unique features and advantages. 

APP/Two-layer system

  • This type of roofing consists of two types of layers, asphalt, and plastic polymers. It is the best combination for weather and heat resistance
  • Has a smooth, aesthetically pleasing surface.
  • It can be applied with a torch or cold glue, making it easier to install.
  • Has a longer lifespan compared to SBS torch-down roofing.

SBS /Three-layer system

  • Composed of a mixture of synthetic rubber and asphalt, providing superior flexibility and durability.
  • It has a textured surface that allows for better adhesion and traction.
  • It can also be applied with a torch or cold adhesive but requires more attention to detail during installation.
  • Offers better resistance to extreme temperatures and foot traffic compared to APP/two-layer system.

Complete guide to installing torch down in six-step

It can be a complicated process to install a perfect torch, but with the right tools and techniques, it can be an explicit method. These six steps can make it easy for a perfect installation:

Step 1: Prepare your Roofing Surf

Preparing the roof involves removing any debris, dirt, and old roofing material to ensure a clean and smooth surface for the installation of torch-down roofing. 

Step 2: Install Underlayment

 Lay down a vapor barrier performs as a safeguard against moisture and aids in leak prevention. Roll out and attach underlayment to the roof surface, making sure there are no wrinkles or gaps.

Step 3: Measure and Cut the Torch Down Rolls

Calculate the area (length and width) and cut appropriate lengths of torch-down rolls according to the measurements. Leave a few inches of overhang on each side for better coverage and protection.

Step 4: Apply Adhesive

Using either a torch or cold adhesive, apply the adhesive (glue)evenly to the underlayment in small sections. Especially be careful of any seams or edges.

Step 5: Lay Down the Torch Down Roll

Apply pressure to the adhesive (glue) with a torch and then roll the surface onto the glue, starting at one end and working your way across. Use a roller to ensure proper adhesion and remove any air pockets and gaps.

Step 6: Seal Edges and Overlaps

  The last and most important part is to pack the boundaries of the roof surface with a torch hot air gun after installing all the rolls. This step will help to maintain the strength of the roofing surface.

Maintaining Your Torch Down Roofing

While torch-down roofing is durable and long-lasting, it still requires regular maintenance for its long life. Here are a few tips for maintaining your torch-down roof:

  • Inspect your roof regularly for any damages or signs of wear and tear.
  • Keep drains clear to prevent water buildup and probable leaks.
  • Cut off any tree branches that may be extending over your roof to avoid accumulation of debris and potential harm.
  •  If you notice any damaged or loose areas on the top, take immediate action to fix them.
  • Consider getting a professional inspection every few years to catch any issues early on.

By implementing these maintenance guidelines, you can guarantee the longevity of your torch down the roof. If you’re searching for a durable and cost-effective roofing solution, torch-down roofing is worth considering for your upcoming project. With correct installation and regular upkeep, it offers dependable protection for your home or building. Always prioritize safety when handling any roofing material and consult a professional if necessary.


Q: How many layers are in torch-down roofing? 

A-Torch down roofing typically consists of two or three layers, with each layer being heated and applied separately. The first layer is a base sheet, followed by a cap sheet, which provides the waterproofing. In some cases, a third layer called a granule surface may also be added for extra protection against UV rays. Nevertheless, the number of layers may differ based on specific building codes.

Q: How long does torch-down roofing last?

A– Torch-down roofing can last anywhere from 15 to 20 years with appropriate setup and upkeep.

Q: Can torch-down roofing be installed on all types of roofs?

A- Yes, torch-down roofing can be installed on flat or low-sloped roofs, making it a versatile option for different building structures.

Q: Is torch-down roofing expensive?

A– Torch-down roofing is generally considered a higher-cost method than other types of roofing materials. Its durability and longevity can outweigh the initial investment in the long run. Additionally, regular maintenance can help extend its lifespan and reduce potential repair costs.

Q: Can torch-down roofing be repaired if damaged?

A– Yes, it can be repaired in case of damage. It is important to check it carefully and regularly and resolve any issue to prevent further damage.

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