IKO Cambridge Shake to Shingle Conversion in Fairmont Hot Springs, British Columbia

Taken from our 2011 archives.

General Roofing Systems Canada Provides Shingle Roofing Throughout Canada. Toronto, Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Kelowna, Vancouver, Whistler, and points between.

Below is a report we received from one of our shingle re-roof crews today from Fairmont. 


Shingle to Shake Conversion, IKO Cambridge Dual Black Lifetime Warranty Shingles, High Profile Ridge Cap, Ice & Water to Eaves and Valleys, Roof Edge Coloured Drip Flashing to Eaves and Gable Ends, Coloured Valley installed in roof valleys (Ice & Water to sheathing, then valley metal, then Ice & Water to sides of metal and synthetic underlay run through horizontal to valley), Synthetic Dupont Underlay to roof deck, Ventilation Corrected – vent holes cut and Duroflo Roof Vents installed, Skylight Re-Flashed with Coloured Metal and Ice & Water Underlayment to Skylight Curb.

Field Report, June 21 2011:

The client’s roof was a cedar shake tear-off/conversion about 20 to 25 years old and was already showing major signs of deterioration, most likely because of the area’s humidity. The flashing on the skylight had been improperly installed, causing it to leak on the top and staining the ceiling on the inside. We wrapped it up the curbs with Ice & Water shield and installed new coloured skylight flashing. Since the main house was a vaulted ceiling, the moisture that was coming in would have went right down the drywall and followed it down all the way to the bottom. Also, because of the vaulted ceilings, the insulation was up close to the sheeting and there were no air vents installed. We cut in and installed two air roof vents one two of the roof’s dormers – both of which had less than 100 ft. of air space.

As you can see from the photos below, the finished Cambridge IKO dual-black shingle roof has great architectural style, especially with the high profile shingle cap.

Completed re-shingling in Fairmont, BC
Shingle Crew Packing Up
Yard clean up complete.
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GRS Roof Valley Spec; install ice and water to roof sheathing, then W coloured valley metal, then ice and water to edges of valley metal, then synthetic underlayment (Dupont roof underlay in this instance).
Completed Shake to Shingle Re Roof (Side of home)
Completed Shake to Shingle (back side of home)
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GRS Shingle Re-Roof Specifications at work, it is impossible for this roof to leak.
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Preparation of valley area – ice and water membrane run through valley area to roof deck both ways prior to vertical ice and water installed, then metal, then Ice & Water to sides of metal.
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Another photo of the preparation of the valley area.
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Skylight Membrane. Premium Ice & Water to skylight curb prior to skylight flashing being installed. Note the order of membrane application. Bottom, then sides, then top of skylight curb.
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Skylight Flashing Specifications at its best.
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Premium Ice & Water 44″ to all eaves and valleys.
Skylight flashing completed. Coloured flashing. Good match to the IKO Cambridge Dual Black Architectural Shingle.
High profile ridge cap shingles, colored W valley flashing, coloured Duroflo vents, shingles are not over exposed and good straight lines in installation.
Coloured Valley Flashing matches IKO Shingles well. Chimney flashed to show black flashing to street view.
Architectural shingle. IKO Lifetime Warranty Cambridge Shingle.


General Roofing Systems Canada (GRS)

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


British Columbia | Alberta | Saskatchewan | Manitoba | Ontario

Low Slope Roofing: Metal, Shingles

Low Slope Flat Roof & Metal Roof
Low Slope Flat Roof & Metal Roof

General Roofing Systems Canada installed low slope roofing systems throughout Canada. Roof installation; 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.

When re-roofing low slope roofing systems it is important to be sure you are using the right material for the right roof slope, local building code, and roof material manufacturer specification.

Below we provide a guideline for low slope shingles, roof membranes of flat roofs, and metal roofing.

Low Slope Roofing Shingles

Serious consideration is required when you are considering re-roofing a sloped system that is less than a 4/12 pitch.

For roofing with a 3/12 pitch, regular shingles can usually be installed with a two-ply 15 lb. roofing felt paper as underlay.

The GRS specification for installing roofing shingles is to never use felt paper. Instead, we use Ice & Water protector on eaves, valleys, around chimney flashing, etc. and use synthetic roof underlay such as titanium. In this instance (with a 3/12 roof), I would consider seriously using only an Ice & Water membrane versus the two-ply roofing felt. This is especially important around chimney and skylight flashing, and any roof vents, valleys, and openings.

A roof that has a 2/12 – 3/12 slope is more tentative and the risk increases. Some shingle manufacturers such as IKO with the Cambridge shingle will put a 12-year warranty on low slope roofs. Malarkey shingles will honour a 30-year warranty.Malarkey Roofing

A roof that is 2/12 or less in slope should have a “flat roof” or traditional “low slope membrane” installed. We like to see any roof that is less than a 4/12 slope get a low slope membrane that is fully adhered, mechanically fastened, or ballasted.

Other information (PDF):

Malarkey Shingle Installation Guide – Includes Install Instruction for Low Slope 2/12 – 4/12

IKO Low Slope Shingle Bulletin – Installation of Asphalt Shingles on Low Sloped Roofs

IKO Roofing – Applying Asphalt Shingles on Low Slopes (covers 3 tab shingles, eave protection, etc)

IKO Shingles
IKO Shingles

Low Slope Roof Membranes (Flat Roofing)

Low slope membranes for flat roofing come in a few categories:

  1. Single-ply membranes in the form of EPDM (rubber), TPO (thermal plastic), or PVC (polyvinyl chloride). They are either fully adhered, mechanically fastened, or ballasted.
  2. Two-ply membrane, the primary choice being SBS modified bitumen that can be torched down or cold applied.
  3. Built-up roofing (BUR). Another way of describing multilayer roofing. An examples would be the traditional tar and gravel roofs, or flat-top tar roofs.
  4. New BUR. More recently, modern technologies have advanced the built-up roof so that they utilize environmentally friendly products and modifiers versus the tar or bitumen commonly used in tar roof systems. These newer versions are extremely tough, will outlast almost any other roof (in our opinion), and are VOC-free, making them sustainable offerings to low slope roof assemblies. The GRS liquid rubber built-up flat roof is an example of a modern system with 800% elasticity and environmentally-friendly synthetic fabric between layers, as opposed to employing the use of traditional tar felt paper.
  5. Spray Foam Roofing.
Low Slope Roof
Low Slope Roof

Low Slope Metal Roofing

Low slope metal roofing (steel, cladding, standing seam) has been used primarily in industrial and commercial settings for decades.

With residential roofing, metal is more typically found on steeper residential roofs. We install a lot of metal systems at mountains villages like Squanism, Canmore, Banff, Cranbrook, Fernie, etc. We also do a lot of residential metal roof shingle installations in cities like Vancouver, Edmonton, and Calgary. Residential metal panel and shingle installations are growing in popularity, but the greatest volume of metal work is on industrial facilities by far.

Low Slope Metal Roof
Low Slope Metal Roof

At issue with metal roofing is that no other form of roofing material expands or contracts as much as metal does. The seams between roof panels, the fasteners, roof openings at vents, chimneys, flashings, and skylights are expanding and contracting all the time. Ultimately, metal roofing leaks due to this expansion and contraction.

Also, condensation with metal or steel roof systems can be an extremely frustrating situation. Many roof leaks with homes or businesses are actually not leaky roofs. Instead, it is water coming through the ceiling as a result of condensation.

Dealing with the potential leak or condensation issues with metal roofing in advance of installing a new system is key.

We solve the problem of metal roof leaks with installing a premium roof membrane under the metal roof system, using a premium caulking tape at the seams, and installing hidden fasteners. If you really want to solve the potential of leaks or condensation in advance, torch an SBS modified membrane or spray liquid rubber in advance of putting the metal roof on.

For commercial roofing and industrial roofing that already has a metal roof on that is leaking, typically we will coat the roof with liquid rubber and it will be good for another 10 years or more. Trying to locate metal roof leaks and deal with them in an isolated way is not usually a good investment of time. Click here to visit the roof coating section of our website.

Until next time,

The Team at GRS


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


British Columbia | Alberta | Saskatchewan | Manitoba | Ontario


Asphalt Roof Shingles: Choices and Reviews

General Roofing Systems Canada (GRS) Offers Asphalt Roof Shingle Replacement, Repair, and Maintenance in 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.

Asphalt Shingle Re-Roof Material We Use and Review Below

IKO Shingles:

GRS repairs and replaces IKO roof shingles on a daily basis.

IKO Roofing Shingles

IKO has a full choice range of shingle materials and has representation in Alberta, British Columbia, and Saskatchewan (IKO started in Calgary). IKO shingles are readily in stock at suppliers and retail stores like Rona. The quality is very consistent as well. The Cambridge, Royal Estate, Grandeur, Armourshake, and Crowne Slate are some of our roofer favourites.

IKO Armourshake Shingles
IKO Armourshake Shingles

From the IKO roofing website, “IKO believes the success and longevity of their company is attributed to three key ingredients: Top quality products, continuous innovation and state-of-the-art manufacturing facilities. A family-owned company now for three generations, IKO intends to be around for many more. IKO products are found on distinctive residential, commercial and engineering structures in more than 50 countries. IKO operates over 20 manufacturing plants globally.” [ Source: www.iko.com ]

GAF Shingles:

GAF was founded in 1886, GAF is North America’s largest manufacturer for commercial and residential roofing.


From the GAF Roofing Website, “GAF attributes its success to be a unique philosophy of: Helping property owners & architects to make their best and safest roofing choices, helping supportive distributors and roofing contractors to build their businesses and avoid hassles.” [ Source: www.gaf.com ]

GAF Tru Slate - Slate Roof
GAF Tru Slate – Slate Roof

The roofers at GRS consistently rate GAF offerings (complete line) to be of excellent quality. GAF also provides specific solutions for various roofing requirements. They manufacture a premium asphalt roof shingle with a wide range of options for shingle style, texture, colour, and optional material that can be used for re-roofing your home (for example, GAF Tru Slate).

Certainteed Shingles:


From the Certainteed Website, “CertainTeed is a subsidiary of Saint-Gobain, one of the top 100 industrial companies in the world. Saint-Gobain employs approximately 22,000 people in North America and more than 109,000 people in 64 countries world-wide.” [ Source: www.certainteed.com ]

Certainteed Roofing has a comprehensive offering of quality asphalt roof shingles. Some of them are known as top performers in their specific categories.

The reviews and ratings of asphalt roof shingles from the roofers at GRS reflect this statement as well. The Presidential, Landmark, and GrandManor Certainteed shingles compete extremely well in their respective categories. Our roofers consistently report the quality to be consistent. We have had excellent commercial and residential roofing success when re-roofing with Certainteed shingles like the Presidential, especially in areas where a shake-looking shingle is the only option (beyond real cedar shake) to comply with the architectural controls of a residential neighbourhood.

Malarkey Shingles

From the Malarkey Website, “Since 1956, Malarkey Roofing Products™ has operated as a family owned, professionally managed, privately held company, headquartered in Portland, Oregon. Malarkey believes in creating long-term value for customers and business partners. Striving for excellence propels Malarkey to new heights in polymerization and the development of long lasting products.” [ Source: malarkeyroofing.com ]

If you know anything about GRS and the position or ratings our shinglers take with respect to Malarkey, you will know that the reviews from our roofers are always positive.

Malarkey shingles are, in our estimation, one of the best alternatives to more traditional or popular asphalt roofing shingles like the BP Harmony, IKO Cambridge, etc. Not that these examples are poor shingles – they are very good asphalMalarkey Roofingt shingles in their respectively categories. It also is not fair to compare a Malarkey Legacy with the Zone nailing strip and the modified rubber polymers in the shingle versus an asphalt-based shingle in a completely different category. However, what we do try, whenever possible, is to move our customers that would normally consider something along the lines of a BP Harmony or IKO Cambridge into a more premium SBS rubber-based IKO or Malarkey product (such as the Malarkey legacy shingle). Comparing a Malarkey Legacy versus an IKO Cambridge is not a reality; you have to compare a

Malarkey Legacy Shingle
Malarkey Legacy Shingle

Malarkey Legacy versus an IKO rubber shingle, not an asphalt one. The reason we try to move our customers up just one step in pricing is that the price difference is nominal for the premium quality you receive. Instead of a “good” asphalt shingle, you get a “great” one with SBS rubber modifiers.

Calgary, Alberta recently experienced two wind storms that blew shingle off approximately 25,000 – 50,000 rooftops in Calgary and Southern Alberta. We experienced not one blow off with the Malarkey Legacy shingles. Now that, in our opinion deserves a high rating!

Owens Corning Shingles


From the Owens Corning Website, “Owens Corning is a global residential and commercial building material provider. A Fortune® 500 Company for 57 consecutive years, Owens Corning is driving sustainability by delivering solutions, transforming markets and enhancing lives.” [ Source: www.owenscorning.com ]

Owens Corning asphalt shingles are now represented and readily available in British Columbia, Alberta, and Saskatchewan at roofing suppliers and retail stores such as Lowes. The quality of the Owens Corning asphalt shingle has always been good, alongside a comprehensive choice of colours, models, and textures.

Owens Corning Colonial Slate
Owens Corning Colonial Slate

Our experience with Owens Corning is more limited than with BP, IKO, Malarkey, GAF, and Certainteed but all indications are from the ratings and reviews from our shinglers is that they are a good quality asphalt shingle.

BP Shingles:

The BP asphalt shingle line-up is well represented in Western Canada and includes the Manoir, Everest, Mystique, Harmony, Mirage, Yukon, and Dakota. The Harmony shingle is the most popular of the BP shingles and it is available in a wide selection of colors. [ Source: www.bpcan.com ]

Cedar Roof Shake Looking Textured Shingles:

Metro Metal Shingle
Metro Metal Shingle

Designer asphalt shingles such as the Certainteed Landmark TL, Certainteed Presidential TL Ultimate, GAF Elk Grande Prestique, Certainteed Presidential Shake, GAF ELK Grand Sequioa, GAF ELK Grand Canyon, GAF ELK Country Mansion, GAF ELK Camelot, Certainteed Carriage House, Grand Manor, and the IKO Royal Estate and Armourshake shingles are examples of designer materials that achieve textured roof profiles.

For asphalt roof repair or replacement pricing call us at +1.877.497.3528 or click here for an online re-roof price estimate request form.

Until next time,

The Team at GRS

General Roofing Systems Canada (GRS)

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


British Columbia | Alberta | Saskatchewan | Manitoba | Ontario


Residential Roofing: Material Choices

Residential Roofing Contractors

General Roofing Systems Canada (GRS) provides Residential Roofing to Alberta, British Columbia, and Saskatchewan. Residential Roofers in Toronto, Calgary, Red Deer, Edmonton, Fort McMurray, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Cranbrook, Kelowna, Vancouver, Whistler, and points between.

Residential Roofing
Residential Roofing

Residential Roofing offers a number of choices for the home-owner.

Flat Roof (Low Slope Membrane) Residential Roofing

There are a number of membranes available when considering flat roofing or low slope membranes for your home. The flat roofing section of our main website explains the various membranes available and this blog has a number of flat roof articles for your home roof that you can search.

Residential Flat Roofing
Residential Flat Roofing

Flat roof membranes fall into one of these categories:

  1. Single-ply roof membranes such as TPO, PVC, or EPDM.
  2. Two-ply membranes such as two-ply SBS modified torch-on (or cold applied).
  3. Multiple-ply built up roof such as the traditional Tar & Gravel or the newer TOUGH ROOF, or multi-ply liquid rubber coated roof.
  4. Spray-on roofing such as liquid rubber or spray foam.
  5. Metal roofing.

For flat roof inspection, maintenance, and repair, our website contains a checklist for homeowners.

Low Slope Residential Roofing

General Roofing Systems Canada - Flat Roof Repair and Maintenance
Low Slope Membrane

If you have a low slope roof (4/12 slope or less), you will want to consider either low-slope membranes used on flat roof systems or a low slope shingle application. Most shingle manufacturers have considerations for low slope shingle application. Some, like Malarkey, also have warranties for such applications.

If you have a low slope residential roof and you are choosing shingles versus a low slope membrane, be sure to check with your local building codes, the shingle manufacturer toward warrant, and be sure your roofing contractors installs the roofing shingles in accordance to the specifications required.

Roofing Shingles, Cedar Shakes, Concrete Tile, Slate, Rubber, Metal, etc.

GAF Laminate Shingle
GAF Timberline Shingle
Hardie Siding 3
Residential Roofing Shingles, Tile, Cedar, Slate, Rubber

The typical covering for residential roofing is to have roof shingles, cedar roofing, some form of roofing tile, or metal roofing installed.

Roofing shingles are now available in hundreds of material types, styles, colours, textures, and are available in speciality types for moss, high wind, UV, hail impact, rubber, etc. Standard types of shingles are made by IKO, BP, Malarkey, Certainteed, GAF, and Owens Corning.

Speciality residential roof coverings such as cedar roofing, rubber tile, concrete tile, metal panels, slate, etc. typically require more research and due diligence than when choosing asphalt shingles. Homeowners have to be even more cautious with selecting the right roofing material and contractor. Failure to choose the right contractor could be a considerable error.

Our blog has a number of articles about selection of specialty residential roofing and our website can assist with a checklist for choosing roofing contractors, roofing contractor accreditationroofing contractor workmanship guarantees, and it also contains overviews of residential roofing materials available.

We also have a section on how to shingle a roof so that homeowners can learn about the right way to install shingles. Be sure to keep it handy if you ever have a contractor on-site so you can check if they are performing the installation correctly.

For residential roofing roof repair or replacement pricing call us at +1.877.497.3528 or click here for an online residential roofing cost estimate request form.

Until next time,

The Team at GRS

General Roofing Systems Canada (GRS)

24 Hour Emergency Roof Repair: Call +1.877.497.3528 toll-free. info@grscanadainc.com.

British Columbia | Alberta | Saskatchewan | Manitoba | Ontario