Calgary Commercial Roofing

General Roofing Systems Canada Repairs, Replaces, and Maintains Commercial Roofing to the Greater Calgary Area. Below is a Commercial Roof Installation Project Spotlight of the MOVAC Head Office Commercial Roof Installation.

Calgary Commercial Roofing Project Spotlight

Commercial Roof Installation Scope
MOVAC Head Office
New Construction
Engineered Sloped Roof Insulation
4 Layers Mop on Bitumen
SBS Modified Base Torch On
SBS Modified Cap Sheet Torch On

This commercial roofing project that is  located in the South East of Calgary, Alberta was for a new commercial building for Movac. The project included vapour barrier including 4 layers of mop on bitumen, a sloped engineered insulation package from Plasti-Fab and IKO base and IKO SBS modified bitumen cap sheet.


Calgary Commercial Roof, Bitumen Mopped
Calgary Commercial Roof, Installing Tar Flood Coat
Calgary Commercial Roof, Mechanically Fastern Roof Insulation
Installing Engineered Slope Insulation
Calgary Commercial Roof, Tar Flood Coat over Roof Insulation
Commercial Roof Ready for Rooftop Units
Calgary Commercial Roof, Tar
Tar Roofing –  in Calgary, AB
Calgary Commercial Roofers, Base Mechanically Fastened to Steel Q Deck of Roof
Roof Board installed to Steel Q Decking
Calgary Commercial Roofers, Roof Hatch Install
Roof Hatch installation.
Calgary Commercial Roofers
Bitumen flood coat to completed.
Calgary Commercial Roofing
Fibre board mechanically fastened prior to SBS Modified Torch On.
Commercial Roof Calgary
Rolling out hot bitumen layers to this .
Commercial Roofers Calgary
Commercial roof system – shows layers of the roof – almost ready for SBS modified torch.
Commercial Roofing Calgary, SBS Modified Torch On, Metal Roofing, Flat Roofing
Commercial roof has SBS Modified Torch On Cap Sheet Installed (grey torch on cap).
Commercial Roofing
One of our Calgary Commercial Roofing Roofers Got Creative by taking photo from inside of where roof scupper would be installed.


Visit our main website for more information on our Calgary Commercial Roofing services.


Until Next Time,

The Roofers at GRS

General Roofing Systems Canada (GRS)
24 Hour Emergency Roof Repair: Call +1.877.497.3528 toll-free.

Calgary, Red Deer, Edmonton, Fort McMurray, Lloydminster, Canmore, Lethbridge, Medicine Hat, Vancouver, Whistler, Cranbrook, Saskatoon, Regina, Winnipeg, Toronto and all points between. British Columbia, Alberta, Saskatchewan, Manitoba, Ontario.

Pros and Cons of Different Flat Roof Systems

General Roofing Systems Canada Repairs flat roofs throughout Canada. Flat Roof Repair; Calgary, Red Deer, Edmonton, Fort McMurray, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

Below you will find the pros and cons of each type of flat roofing system we offer written by our Alberta roofing repair crew. A link has also been provided below to our main website describing each.

Spray Foam

While moderately low in price, this is largely based only on individual perceptions. As far as material efficacy goes, spray foam is seamless and light. However, in Canadian weather, it is subject to cracking due to extreme hot/cold shifts, and a failure can result in a complete re-roofing being required. As well, maintenance mandates top-coating, which contributes to expenses – nullifying perceptions about spray foam being a low cost solution.

Single-ply Systems (EPDM/PVC/TPO)

While these have been excellent systems in terms of performance and a lower initial price, they do not have the longevity of 4-ply tar and gravel or 4-ply liquid rubber. As well, these systems are vulnerable to tearing over time. The installation process also entails using mechanical fasteners, which provides another damage vector with respect to water and strong weather conditions.

Tar and Gravel

A seamless and versatile system, which also has a long life if maintained properly. However, the installation process can be quite messy. As far as maintenance goes, leaks can be difficult to find. As a result, maintenance costs are higher than single-ply systems and liquid rubber application. Maintenance or repair with tar and gravel systems often entails a vacuuming as well if damaged sites are difficult to locate.

SBS Torch-on

This system is lighter than 4-ply and has a broad range of application methods. However, torching is not seamless and the life cycle is shorter than 4-ply systems. A fire watch is also required during installation, which contributes to a higher price point.

Liquid Rubber

Seamless, UV stable, and elastic, this is a system which we have had a lot of success with in the Canadian climate. The 1000% expansion rate provides a “cushion” for extreme weather changes, which makes it resilient to tearing and leaks. The system is also multi-purpose, having applications in gutters, too. However, the price point is initially higher. In terms of total life cycle cost, it is similar to all other systems.


We usually recommend single-ply systems and liquid rubber to our clients. Single-ply systems are more economical on the front-end and perform well. Liquid rubber also has the least chance of failure, as it is the most predictable and is 4-ply. Also, it is the system most suited to Canadian weather due to its elasticity.

For more information about each system we have described, visit our main site by clicking here for more information on flat roofing.

Contact Us:
General Roofing Systems Canada (GRS)

24 Hour Emergency Roof Repair: Call +1.877.497.3528 toll-free.

British Columbia | Alberta | Saskatchewan | Manitoba | Ontario