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Flat roofing services, including tie-ins to all types of sloped roofing.

24 hours

Professional Roofers for Torch-on Roofing in Calgary and across Alberta

If you live in Alberta or surrounding areas, you might face some tough challenges in maintaining the roof of your house or commercial building, especially if it is a flat roof. To ensure that flat roofs stand the test of time against snow, hail and wind, you must ensure that they get the special care they need. Flat Roofing Ltd is your local roofing expert who can guide you on how to maintain a strong flat roof for a long time.


As a reliable roofing contractor in Calgary, Flat Roofing Ltd has the expertise and skills to ensure your roof is well-maintained, with a torch-on roofing process to keep the water out of your roof. If you have a flat roof or slightly sloped roof and need expert advice on torch-on roofing in Alberta, feel free to connect with us.


Note: We specialize in torch-on roofing and you can trust us to provide best-in-class torch-on roofing services in Alberta.

What Is Torch-on Roofing?

Torch-on roofing is a special process that helps in ensuring the best seal and waterproof finish in flat roofs and low-sloped roofs. This process makes use of an open-flame propane torch to seal your roof against the elements. The process uses an asphalt compound called bitumen as roofing material to seal the roof. The bitumen is modified by adding rubber or plastic to increase its strength and hence is often referred to as modified bitumen. The rubber in bitumen enables it to expand and contract without causing cracks on melting.

To make the material effective, it is heated to the point that it melts. The melted material offers high tolerance to heat, cold, and moisture. Torch-on roofing is a time-tested method to make your roof water and weather resistant. We also offer two-layer roofing and three-layer roofing for extra protection.


As flat roofs are likely to hold water from rain and snow for a longer period of time than sloped roofs, there are chances of damage. In such cases, torch-on roofing offers the protection your roof needs.

Components of Torch-on Roofing Systems

Insulation: The torch-on roofing utilizes an insulation material to help a flat or low-slope roof retain heat in the building/structure. It is the first thing to be applied either mechanically with screws and plates or using a hot mop. The process of attaching insulation depends on the deck type.


Vapour barrier: After insulation, the next thing to be applied is the vapour barrier. This barrier helps in keeping a check on the condensation and moisture problems.


Overlay board: To support the torch-on membrane, an overlay board is used. This board helps in preventing water pooling on the roof.


Base sheet: The first layer of modified bitumen which is applied is known as the base sheet. Your roofing expert may use direct heat fusing, hot mopping or adhesive to secure the sheet.


Cap sheet: A smooth cap sheet is applied as the top sheet of the torch-on roofing. The cap is rolled out and is heated at the bottom using a torch so that it adheres to the top of the base sheet. The two layers are attached to form a seal. In the three-layer system, the third layer with granules is applied in the same way.


Flashing for penetrations: The typically used material for flashings is a self-adhering modified bitumen membrane. Metal flashing is also used above the modified bitumen flashings.

Benefits of Torch-on Roofing

Besides making your roof waterproof, torch-on roofing provides protection across all seasons. It expands when it’s hot and contracts when it’s cold thereby offering your roof resistance against heat. The torch-on roofing process is completed after the application of a smooth cap sheet. This cap sheet has multiple benefits, such as increasing the energy efficiency of the building, offering resistance against ultraviolet rays, keeping the building cool, and increasing the life expectancy of your roof.


We recommend torch-on roofing systems for slightly pitched roofs, between ¼: 12 to 1: 12 pitch. It is an excellent choice if you are looking for a durable and long-lasting roof that offers protection against snow.

Brands We Use

Flat Roofing Ltd trusts only the best to offer you top-quality products and services. We are associated with trustworthy and reputed names for quality torch-on roofing systems. The brands that we use are:

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No More Moisture

Torch-on roofing helps in protecting the interiors of your house from any kind of leakage with excellent waterproofing.

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Contact Details

Flat Roofing Ltd

258048 16 St E,

Foothills, Calgary, AB T1S 3M1

Alberta:  403-995-2128

Fax:  403-995-2191


Office Hours
Monday to Sunday: 06:00 AM – 06:00 PM

After hours service available

Service Area

  • Alberta


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