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H&J Roofing and Exteriors
407 Cedarpark Dr. SW
Calgary, Alberta T2W 2J6

H&J Roofing and Exteriors
407 Cedarpark Dr. SW
Calgary, Alberta T2W 2J6

Commercial Roofing Calgary

H&J Roofing and Exteriors

(587) 433-9746

Commercial Roofing Calgary

Located on the doorstep of the Rocky Mountains and the southern plains of Alberta, the city of Calgary is subject to extreme changes in temperature and climate. This wide range of weather patterns can take its toll on your business or office buildings roof. It is quite common in this region to have significant roof malfunction, with little or no warning. When the roof of a commercial building fails and causes a leak inside; the extent of the damage can be significant. A small leak inside may not seem like a costly repair, but for water to have worked its way through five layers of roofing membrane means that five layers are in need of repair. Let us look at the five different layers of a commercial flat roof system.

Commercial Flat Roof System

Vapour Barrier

This will be the first membrane placed over the plywood sheeting of a commercial roof. Its purpose is to prevent the penetration of any moisture on the wood decking. Moisture does not always have to come from a leak. Condensation can simple develop through shifts between warm and cold temperatures.


Once our vapour barrier is in place, the next layer will be our ISO insulation. ISO insulation provides the building with its insulating value. With a thickness of one inch, ISO insulation can provide an R-value of 6. Most commercial buildings require a minimum R-value of 18. This means we will use three inches of ISO insulation.


The third layer in this roof system is our firebreak. This layer consists of a fire rated gypsum board. This will protect the layer beneath from the fire hazards associated with installing the last two layer. The gypsum board is also essential because it provides a smooth and flat surface preventing any wrinkles in the membranes to be installed overtop.

Base Sheet

Now that we have our firebreak in place we install the base sheet. This fourth membrane will be installed using propane torches, which heats up the bitumen surface and allows it to adhere to the gypsum. Once this layer of the flat roof system is installed the roof is watertight.

Cap Sheet

Our last and final layer in a commercial flat roof system is the cap sheet. This is by far the most crucial layer in the entire system. The cap sheet is responsible for withstanding the external elements such as wind, rain, snow and UV rays. Most people do not realize without UV ray protection the materials on our roof’s would simple deteriorate in a short period of time.

Commercial Roofing Experts in Calgary

Calgary is subject to some of the most extreme temperature changes in Alberta and such weather can take a significant toll on your commercial rooftop. Whether you’re in an office building, retail strip mall, or a warehouse, small leaks tend to be common issues leading to costly repairs. There are several differences between residential and commercial roofs, from structural design to building material. In a typical commercial flat roof system, there are five layers of membranes; the vapour barrier, insulation, firebreak, base sheet and cap sheet. Each layer serves a vital purpose and requires the skill, knowledge and experience of a commercial roofing company to install and repair. The cap sheet is what provides protection from external elements including wind, rain, snow, and UV rays. The process of commercial roofing is complex, but you can trust the experts at H&J Roofing to take care of all maintenance, repairs, and replacements.

Rolled Teflons and Roof

Your Commercial Roofing Solution in Calgary

From repairs to replacements, we are your commercial roofing experts. We can address all issues from pooling water to splits, cracks, or bubbling of the external membrane layers. When it comes to commercial roofing, there’s no one better than H&J Roofing. Our contractors are all trained and experienced, our process is hassle-free, our products are top-quality, and our prices are competitive. Unlike other roofing and exterior companies, we provide real and lasting results as opposed to Band-Aid solutions. Over the last five years, we have worked to develop relationships with our clients in order to establish a foundation of trust and understanding. We have what it takes to meet your exact specifications and exceed your expectations, taking the time to listen to your needs. From vinyl decking to roofing and eavestrough repair, we love what we do, and we look forward to being your first call for all roofing and exterior needs.

How Do I Know My Commercial Roof Needs Replacing?

Here is a list of signs your commercial roof needs a replacement or inspection by a professional.

More subtle indicators include the following:

  • Granules on the cap sheet are missing
  • The cap sheet is dry and brittle with surface cracks
  • Bubbles
  • Ponds of water that do not drain
  • The roof should not be more than 25 years old
  • Seams between the cap sheet have split away from one another

Commercial Roof Repair: How We Can Help?

We offer a wide range of top-of-the-line roofing services, including both repairs and full roof replacements. Contact us to find out more about how we can keep your commercial roof working for your company for years to come.

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