Thinking about installing a new roof, but not sure if torch down is worth your investment? There are lots of factors you need to consider before deciding on anything. If you are dealing with a flat or slightly sloped roof, your biggest challenge will be to keep water from sneaking in.
In that case, you need torch down roof. It’s durable, reliable, flexible, and offers outstanding waterproofing. However, there are still too many factors that can affect your decision-making.
Today, we are going to discuss torch down roofing details and highlight what it exactly is, what materials it uses, how it can be installed, its types, and much more.
What is Torch Down Roofing?
First things first, many people inquire about what is a torch down roof and how it works.
Torch down roofing, which is sometimes called torch on roofing, is a type of membrane roofing system designed for flat or low-slope roofs. Torch-down roofing basically uses modified bitumen sheets for maximum durability, strength, and flexibility. These sheets are heated with a propane torch so they can bond easily to the roof surface and create a smooth, watertight layer.
This method is good for roofs that face pooling water or heavy rains.
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Why Torch Roofing is Popular for Flat and Low-Slope Roofs?
Flat roofs do not drain water as well as steep roofs. This means you need a roofing material that can easily handle:
- Pooled rainwater after storms
- Snow loads in winter
- UV rays in summer
- Temperature swings without cracking
Torch-down roofing can efficiently handle all these. That’s the reason it is mainly used on commercial buildings, garages, and residential extensions.
Types of Torch Down Roofing Systems
Torch-down roofing system comes in two popular types. You can choose from them depending on your needs and budget.
1. Two Layer System:
Two-layer system consists of a base sheet + smooth cap sheet. It offers great waterproofing and flexibility. People choose this type because it is more affordable than a three-layer system. It is common for commercial roofs or budget-conscious projects.
2. Three Layer System:
Three-layer system consists of a base sheet + a smooth cap sheet + a granulated cap sheet. This granulated layer adds extra UV protection, better fire resistance, and strong durability against foot traffic. It has a long lifespan compared to a two-layer roof system.
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What is a Torch Down Roofing Material?
Torch down roofing membrane usually comes in two flavors, and each one has different benefits.
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APP (Atactic Polypropylene) Membrane:
This is a plastic-based modifier and has high resistance to UV rays. It’s best for warmer climates and tends to be more rigid than SBS.
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SBS (Styrene-Butadiene- Styrene) Membrane:
This is a rubber-based modifier and is very elastic and flexible. This means it’s ideal for areas with large temperature swings. It resists cracking in cold weather.
Torch Down Roofing Installation Steps
Torch-down roofing installation is not a DIY project. This job is complicated and must be done by trained and qualified pros.
The typical process involves these steps:
- Prepare the surface of the roof for cleaning, smoothing, and removing old roofing if needed.
- Lay insulation boards to create a level base and improve energy efficiency.
- Install a vapor/moisture barrier to protect insulation from trapped moisture.
- Add an overlay board to provide a sturdy foundation for the roofing membrane.
- Apply the base sheet using heat or special adhesive for strong bonding.
- Torch on the cap sheet by melting the bitumen underside to seal it to the base.
- Install a granulated cap sheet (in three-layer systems) for extra UV and fire protection.
- Seal all flashings and edges to ensure complete waterproofing around corners and vents.
Some Safety Considerations During Installation
Due to the open flame, torch-down roofing involves various safety considerations, such as:
- Ensure fire extinguishers are on hand during the job
- Keep a clear work area — no flammable debris nearby
- Follow local building codes and insurance requirements
- Only hire qualified roofing contractors from MCS roofing who have decades of experience handling complications
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Benefits of Torch Down Roofing
Torch down roofing offers plenty of benefits, such as:
Watertight protection: No seams for water to sneak through
Flexible: Expands and contracts with temperature changes
Durable: It can handle heavy rain, snow, and foot traffic
Energy-efficient: Its reflective surfaces can reduce cooling costs
Long lifespan: It has a long life, typically 15–20 years, sometimes longer, with good care
Fire-resistant: It is fire-resistant, especially with granulated cap sheets
Low-maintenance: Requires minimal upkeep compared to some flat roof materials
Repairable: Damaged sections can often be patched without replacing the whole roof
How to Maintain Torch Down Roofs?
Although torch down roofs require very low maintenance but it is important to follow these tips for a longer lifespan:
- Inspect twice a year — ideally in spring and fall
- Check after severe weather for tears, lifted edges, or punctures
- Clear debris regularly — leaves, sticks, and dirt can trap moisture
- Ensure drainage is clear — prevents pooling water
- Patch small damage quickly — before it turns into a leak
When is Torch Down Roofing Worth Considering?
Torch-down roofing is worth considering,
- Your roof has little to no slope
- You need maximum waterproofing
- You live in an area with harsh winters or strong sun
- You want a long-lasting, low-maintenance solution
- You’re okay with hiring pros for installation and repairs
Bottom Line
Torch-down roofing is one of the most dependable flat roof solutions out there. It offers a strong, flexible, and waterproof barrier that can last decades when installed correctly. It’s not the cheapest or easiest to install, but if you want peace of mind during heavy rain, snow, or blazing sun, it’s well worth the investment.
Just make sure you choose MCS Roofing Company, which has a team of qualified and experienced roofers. Our success with torch-down roofing comes down to skill, safety, and attention to detail. When you choose our right installers, we can keep your property protected for years to come.
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