A Torch Down Roof: Why It’s the Best Defense Against Chicago’s Climate
You can often see flat and low-slope roofs in Chicago’s architectural landscape. However, Chicago’s weather is no joke – icy winters, humid summers, and sudden temperature swings can test any roof. That’s why a flat roof needs more than just a basic cover. It must be strong, flexible and watertight. Torch down roofing has become a top solution for both homes and businesses. The reason is simple – it’s durable and weather-resistant. This seamless system consists of heat-welded modified bitumen sheets. It expands and contracts with Chicago’s freeze-thaw cycles without cracking, and its sealed seams prevent leaks from heavy rains and melting snow. Read on to learn everything you need to know about torch-down roofing!
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What Sets Torch Down Roofing Apart
Torch down roofing is often called modified bitumen roofing. It is a layered system that uses a modified bitumen membrane and asphalt enhanced with polymers. This membrane is then “torched” onto the roof with a propane torch. The heat melts the bitumen and creates a strong, waterproof bond. As a result, you get a seamless, protective layer that is extremely resistant to leaks and weather.
How does this roofing solution compare to popular alternatives? For example, built-up roofing (BUR) also uses asphalt, but torch down is easier to install and cheaper. EPDM roofing and TPO single-ply membrane are also widespread, but torch down can offer superior puncture resistance and a more robust feel. It creates a strong, fused bond and reduces the risk of seams gaps or water getting under the membrane. That’s why torch down is a perfect fit for Chicago’s freeze- thaw cycles.
Pros and Cons of Torch Down Roofing for Flat Roofs in Chicago
First, let’s weigh the strong and weak sides of this roofing membrane.
Is Torch Down Roof Right for Your Property
It’s fine to know the general pros and cons of torch down roofs. However, you must also take into account the unique needs of residential and commercial buildings. Here are additional benefits of these roofs.
Residential buildings
- Noise insulation. Don’t know how to reduce the noise from traffic and nearby buildings in Chicago’s busy urban areas? Torch down roofing offers sound insulation and makes your home much quieter.
- Rooftop gardens and rest spaces. A torch down roof can be transformed into a garden or just a space for relaxation. It ideally supports plants, furniture, and foot traffic.
Commercial buildings
- Load-bearing strength. Commercial buildings often need roofing systems that can support heavy equipment like HVAC units. Torch down roofs are good for this purpose.
- Fire safety. It’s a critical feature for commercial properties. Fire-resistant qualities of torch roofs comply with Chicago’s strict building codes.
- Long-term savings. Durability and low maintenance make torch down roofing economically attractive for commercial property owners.
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Types of Torch-Down Roofing Material
These systems come in different configurations and materials. Here’s simple explanation of the main types:
- Two-Layer System. It consists of a base sheet and a cap sheet. This system is lightweight, cost-effective, and ideal for residential buildings or smaller commercial properties. Property owners choose it because it is easier to install and still provides excellent waterproofing and durability for moderate-use roofs.
- Three-Layer System. It comes with an extra reinforcing layer. This type is more recommended for high-traffic commercial roofs or buildings with heavy rooftop equipment. The additional layer improves resistance to punctures and overall roof wear and tear.
These systems also differ based on the type of roof polymer used to modify the asphalt:
- SBS-modified bitumen. This type uses Styrene Butadiene Styrene (SBS) polymers, which perform well in cold climates. SBS-modified bitumen is often used in two-layer systems and is recommended for areas with high temperature fluctuations.
- APP-modified bitumen. This type uses Atactic Polypropylene (APP) polymers, which offer excellent UV resistance and are great for roofs exposed to direct sunlight. APP-modified bitumen is often used in three-layer systems.
Common Myths About Torch Down Roofing
There are enough misconceptions about torch down roof systems. However, many of them are far from being true. Here are some examples.
Myth. Torch down roofing is a fire hazard.
It’s true that a torch is used during installation, but it is not dangerous when handled by trained professionals. Roofers know how to control the flame and follow safety steps to reduce fire risk. The roofing materials themselves are fire-resistant, and proper flashing and edge work make the system even safer. The real danger comes from DIY installations. With a skilled crew, the process is safe.
Myth. Torch down roofing is only for flat roofs
Torch-on roofing is most popular for flat and low-slope roofs, but it can also work on slightly sloped surfaces. The key is the slope cannot be too steep. If the angle is too sharp, the material won’t stick properly and could slide.
Myth. Torch down roofing is a short-term solution
Many homeowners think torch down is a quick, temporary solution. In reality, it’s durable. A certified roofing contractor uses quality materials and installs them correctly. Such a roof will protect your building for 20 to 30 years, and even longer.
How Professionals Install Torch Down Roofing
This process does not seem to be difficult at first glance, but it requires skills and care:
First, roofers check the entire roof deck. They clear off debris and fix any weak spots. If there’s an old roof, it must be removed to start fresh with a solid base.
Next, workers attach a base sheet to the deck with roofing nails or screws. This is the first waterproof layer of torch down roofing. Then comes the torch work. Roofers use an open-flame propane torch to heat the bottom of modified bitumen sheets. The heat melts the material underneath, and it sticks tightly to the base sheet.
Seams and edges are especially important. Roofers overlap the sheets properly and press them down firmly to prevent leaks. They carefully seal everything around chimneys, vents, and other openings.
Finally, a top layer or the cap sheet is added. It’s often covered with granules which protect against sun damage and add extra durability.
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Cost of Torch Down Roofing
This roof in Chicago roughly costs between $4.50 and $8.50 per square foot. So, for a 1,500-square-foot flat roof, you will pay $6,750 to $12,750. But the final price can change depending on a few key things:
Roof size and complexity. Complicated roofs with lots of angles, skylights, or other nuances can push labor costs up by 20-30%. If your roof has chimneys, vents, or HVAC units, each one can add $200 to $400 for extra flashing work.
Materials. Two-layer torch down roof costs $4.50 to $6.00 per square foot. Three-layer torch systems are $6.50 to $8.50 per square foot. And high-end materials (like UV-reflective features) can add $1 to $2 per square foot.
Chicago-specific costs. Installation in the city is often a bit pricier than in the suburbs. You may also need permits or inspection – it’s $500 to $1,000. Hard-to-reach roofs in tight city spaces need special equipment or safety setups – this is another 10-15% to the costs.
So, the cost of a torch down roof can vary a lot, but knowing these factors helps you understand where your money’s going.
If you are planning to install a torch down roof, the cheapest way is to entrust this task to a commercial roofing contractor. Professional roofers will handle roof replacement from the beginning to the end. You will avoid a lot of costly mistakes and headaches. If you are based in the Chicago area, we are ready to become your trusted roofing partner. We know everything about torch down roofing. Call us today to discuss your needs and get the optimal torch down solution for your roof!
FAQ
How long do torch down roofs last?
A properly installed torch down roof lasts 15-20 years. However, regular maintenance and professional installation can prolong this term to 25 years. The lifespan heavily depends on local weather conditions, maintenance quality, and installation expertise.
Is torch down roofing the same as rolled roofing?
No, they are different. Torch down roll roofing uses modified bitumen sheets that are heat-welded to the roof surface – a propane torch is used for this. Regular rolled roofing is a lighter, less durable material that is nailed or adhered with cold adhesive. Torch down roofing is also durable and waterproof.
Are there any eco-friendly options for torch down roofing materials?
Yes, eco-friendly roofing torch down options exist. Some manufacturers now produce membranes containing recycled materials and reflective surfaces that improve energy efficiency. Cool-roof versions can reduce energy consumption, and some products are recyclable at the end of their lifespan.
Can torch-down roof system be installed on top of an existing roof?
It is possible but not recommended. Only a professional roofer can determine if the existing roof structure can support additional weight. Most experts recommend to remove the old roofing to inspect the deck and ensure proper installation.
What are the common signs that a torch down roof needs repair or replacement?
Warning signs are blistering or bubbling of the membrane, separated seams, cracking or splitting, water pooling, and interior leaks. If you notice any of these, immediately contact your roofing contractor for professional help.