Roof Snow Removal, Ice and Snow Loads on Roofs

General Roofing Systems Canada (GRS) has extensive experience with roof snow removal, ice dam removal, and emergency roof response. Rooftop Snow Removal in the following cities: Edmonton, Red Deer, Calgary, Fort McMurray, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Cranbrook, Kelowna, Vancouver, Whistler, and points between.

A Snowfall Warning was Issued at 4:21am for Edmonton, Red Deer, and other parts of Alberta.

The current question remains : Will the roofs be able to hold 15 – 20 cm if we actually receive that amount of snow on our roofs. 

Environment Canada Snowfall Advisory that is presently released by the weather network

General Roofing Roof Snow Removal Crew on Industrial Roof

Snowfall Warning

Issued at 4:21 AM MST Friday 24 February 2012


Snow is on the way.


A strong low pressure system off the British Columbia coast is forecast to track into Alberta today. Snow will begin in the Whitecourt region late this afternoon and will spread east southeastward into the Edmonton region by late evening. 10 to 15 centimetres of snow is expected by Saturday evening.
Snow removal services are a key part of our business. So when weather advisories like this occur, we are not disappointed as it enables our roofers to remain busy during the winter months.

HOWEVER, considering what happened last winter where  roof collapses were almost daily  due to business owners with commercial buildings in Edmonton, Red Deer, and other areas of central and northern Alberta being caught off guard and not able to get the snow off their roof-tops.

SNOW REMOVAL from a flat roof in a timely fashion is serious issue that GRS does not take lightly,

One of our main concerns is with some  owner’s of the commercial buildings, especially those with large roof spans that have had major snow loads on their roofs last winter and have not taken the steps to structurally repair their roof systems.  So when this amount of snow gets dumped on the roofs,  Especially in one fall in such a short period of time, the snow will then get wetter and heavier causing more damage. Once the snow melts it is almost guaranteed that there will be a significant amount of damage and problems. We can almost expect a significant amount of calls coming from the Edmonton, Red Deer and area this weekend and next week.

HOW MUCH SNOW CAN A FLAT ROOF IN GOOD STRUCTURAL CONDITION HOLD WITHOUT IT COLLAPSING? The answer to that question is complicated. It depends on the roof span of the trusses, whether or not it is a flat roof or sloped roof etc. Last year there were roofs with less than 18″ that collapsed, but these were poorly designed and had very large roof spans.  The problem is not just specifically snow, it is the rain on snow and the melting snow turning to ice or blocked roof drains when rains come. Considering the storms that Alberta had last winter with such drastic snow loads, there is a strong  likelihood that many roof systems were weakened. Our advise is to remove snow from flat roofs  in Alberta , especially if the snow loads are predicted to be quite large.

For more information on roof snow removal, ice dams, snow loads, attic ventilation and condensation, and various other things that occur to roofs when snow and ice cause havoc, you can search our blog. We have a number of articles written by our crews that have fought the snow loads on rooftops last season.


General Roofing Systems Canada (GRS) is a Comprehensive Building Envelope and Roofing Contractor serving Western Canada. Including such areas as: Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler, and various points between.

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.

Emergency Roof Repair Situations

General Roofing Systems Canada provides roof repairs throughout Canada. Roof Repairs are completed in the following cities; 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.

Emergency Roofing Repairs

Wind Warnings and Torrential RainFall has been causing roof failures in British Columbia, while meanwhile in Southern Alberta high Winds are Blowing Shingles, Shakes, and Tiles off Roofs Again.

This week has been tough on roof systems from the West Coast all the way to Saskatchewan. Our call center has been over-whelmed with wind related roofing repairs calls along the West Coast including Victoria, Vancouver Island, Vancouver, Vancouver North Shore, and in the Fraser Valley. While in Southern Alberta such areas like Lethbridge, Medicine Hat, Okotoks, and even into Calgary have been experiencing wind gusts of up to 120 km/h.

The unusual high winds have been tearing shingles off roofs and causing general havoc with a variety of roofs types. We have received calls with complaints of skylights blowing off or leaking, roof vents, flashing, and even roof hatches needing repair.

With the heavy rain on the West Coast, this has caused flat roofs to fail, this particularly has applied to those that have drainage issues or drains that are plugged. With the cycles of having warm air thawing to only freeze again due to the Chinooks in areas like Calgary, AB, this has been resulted in our 24 Hour Toll Free Emergency Roof Repair line to receive several repair calls.

We are finding that Roofs with improper attic ventilation are having condensation issues to areas even as far north as Edmonton and flat roofs are requiring more maintenance to clear drains that are freezing over with ice.

Solutions for Roof Repairs, Attic Condensation, and Roof Drainage Issues

There are some solutions we can offer to help with the various problems roofs have this time of year. However If you cannot solve the repair or maintenance issue by yourself, call our 24 hour emergency roof repair toll free number at 1.877.497.3528 and schedule a repair person to attend.

Flat Roof Membranes
Repair Crew Fixing Flat Roof Connected to an Industrial Metal Roof

Flat Roof Drainage Problems: Flat roofs unfortunately do require some regular maintenance, especially in high winds and freeze-thaw cycles.

Roof Drainage: The roof drains are prone to clog from leaves, tree branches, and with the ice and snow melting and freezing on the roof. Drainage problems on flat roofs can also be compounded by an inadequate slope of the roof. Nonetheless, a spring and fall maintenance of the roof is key to ensuring the roof bears well during bad weather. Click here to see our  Flat Roof Maintenance check list.

Roof Inspection: Extreme winds, heavy rain-fall, and snow and ice melting should trigger an inspections to be completed. It is preferable that this is completed during the storms to ensure our technician’s ability to see if the roof drains are clear.

Roof Slope Problems: With improperly sloped flat roof systems, there are solutions to mitigate these issues. An improper roof slope can be examined with our technician at the time of inspection or while we are performing maintenance to your roof.

Condensation in Attic Spaces

Roof Sheeting Mold, Attic Mold, Condensation II
Condensation in Attic Space

Sloped or Pitched Roof Attic Condensation Problems Attic condensation repairs or remediation tend to be a more involved process requiring a number of steps.

Solving Attic Condensation

Your attic require proper ventilation. You need to check the intake air typically at the roof soffits to be sure that there is enough air coming in to your attic space. Be sure to check that insulation is not covering the air from entering your attic by following the air flow along the roof sheathing to where you come to the ridge or peak of the roof.

Check the exhaust vents (typically by each square foot or along the ridge) to be sure they are not plugged with snow and see if there are enough roof vents. You will need about 1 square foot of roof venting per 100 – 300 square feet of attic. A calculation commonly used by our roofers for attic / roof ventilation is 1:250. If the air vents exhausting the intake air is appropriate then you need to check the vapor barrier of the attic. It cannot be compromised and be letting warm air in.

Warm air rises through the attic into the roof sheathing. The snow on the roof then melts and creates ice dams. The ice dams then back up under shingles, shakes, and tiles causing leaks in to attics and then ultimately in to your house through the ceiling. If none of these problems can be found in your attic, it is best for you to then call the experts.

Shingles Torn off in winds

Wind Blows Shingles off Improperly Installed Shingle Roof in Calgary
Shingles Torn off in Winds

High Wind damage and Roof Repairs to Shingles, Tiles, and Shakes Repairing Damaged Roofs: Ultimately, after the installation of shingles, tiles, or shakes are complete and the winds begin to increase, you can now face blow-off problems. The best we can do is repair the windblown damaged roof.

How to Shingle a Roof: Prior to having your roof replaced, it is a good idea to know the specifications and the proper way to shingle a roof to ensure your roofing contractor is in check at time a roof replacement is required. Our website has a series on How to Shingle a Roof that explains the process of shingling for areas with high winds and how to avoid costly repairs due to wind damage.

Roof Underlay: Beyond the actual installation principles when replacing your shingles, shakes, or tiles there is the issue of the roof underlay. If the proper roof underlay is used and is installed correctly, then one does not have a concern in regards to shingles, shakes, or tiles being blown off. The roof underlay or membrane will keep the roof water-tight with-out the shingles so no leaks occur.

Shingles for High Winds: Finally, there are roofing shingles available that are designed to withstand high winds. Shingles like the Malarkey Legacy have high wind ratings of up to 170KM per HR which gives areas like the West Coast, North Shore of Vancouver, Calgary, Lethbridge etc. some advantage over the winds that damage roofs every year.
Should you have any questions or concerns regarding your roof, our office is always able to provide over the phone advice, set up inspections or arrange for a complete repair.

Until Next Time,

The Team 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, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

Flat Roof Membranes: Sample Customer Query

Below you will find a customer inquiry we had in Fall 2011 referencing flat roof membranes for a new inner-city home our customer is having constructed in Calgary, Alberta.

This fellow was the unfortunate recipient of what occurs in the flat roofing industry every year – there is a year-end tsunami we as roofers experience when panicking clients need to have their flat roofing systems maintained, replaced, or repaired. It turns into an “all hands on deck” period of time during this so-called tsunami, especially for our commercial roof and industrial roof clients. This particular flat roof membrane query unfortunately took some time to return, but the client was gracious nonetheless. Please note that the quoted blocks in italics are our responses to the client’s questions.

< Start of Email >

Well thank you very much for the in-depth follow-up, it is much appreciated.
I do have several questions, some of which may overlap with others. Please bear with me, my inexperience with flat-roofing necessitates a bit more research, and there seem to be so many systems that it is difficult to know which is more appropriate than the next.
1. With the liquid rubber roof coating system, will the membrane simply seal around any punctures in the roof (i.e. irrigation line for the planter box, roof skylight openings, scuppers in the parapet), or does this require separate attention?
Liquid Rubber roofing, at least the specification GRS applies liquid rubber roof coating to is a process of steps. The first being cleaning the substrate or roof deck, next is preparing all roof penetrations, fasteners, expansion joints, connections, etc with a scrim fabric sheet (polyester woven scrims) and trowel grade liquid rubber (done by hand with trowel, squeegees, and rollers), then a flood coat of liquid rubber (sprayed), and then the final stage of liquid rubber roof application is a final spray coat of liquid rubber. Another coat is optional to add colour. This is done with an acrylic top coat. The liquid spray on acrylic roof coat can be specifically tinted to the desired color.
2. Do you recommend, as per the liquid rubber system, a 2-layer approach (using the Sealroof A-100 over top the Sealroof B-200), in the same way you would do a 2 or 3-layer torch on system? In this way, you could apply a white top-coat < GAF Top Coat > to help reduce the heat island effect on the roof and help alleviate the temperature variation in Calgary?
The GRS process of application for liquid rubber roofing, flat roofing, and pitched roofing is typically more involved than most specifications our roofers see day-to-day in the marketplace. Specific to Liquid Rubber roofing, our system of application is detailed at point 1 above. Top coating the liquid rubber is also detailed above and there is an article linked to our website specific to the white and black decision with flat roof membranes found here (Carlisle-Syntec Article).
3. My current details include a sloped insulation for added R-value, over top of a ventilated ceiling cavity with vents in the parapet wall. Who do you get your sloped insulation from, and is it custom made for the project, or does it require labour to adjust it? Is it possible to simply install sleepers above the roof joists to achieve slope and sheath the roof and apply the membrane overtop of that, and sacrifice the added R-value of the sloped insulation? Is that normal?
Sloped insulation for flat roof structures is a common method. Many designers will specify the framing of the substrate to be sloped also as an alternative. We source our sloped roof insulation from a number of companies. One we often use in your area is Plasti-Fab. It is a pre-engineered sloped insulation that is delivered with a diagram for installation. We would have difficulty answering to the roof sleepers question until on site or more discussion was had.
4. You mentioned custom metal flashings, and I am wondering what the scope of your roofing will entail (in other words, do you also provide flashing around skylights, and around scupper holes for drainage)?
Various roof flashing required we provide to our flat roof customers. Typically, roof skylights will have flashing kits, but various designs will have us custom fabricating metal. Whether it is flat roof cap flashing, cant flashing, edge flashing, or various custom flashing for roof membranes… we fabricate and install it.
5. You mentioned the TPO system (which I have been recommended to use from a colleague) is more suited for Vancouver than for Calgary. What are the reasons for this? Is it strictly based on freeze/thaw considerations or total precipitation, snow loads, or some other reason? One of my biggest concerns is that the roof membrane will not stand up to the temperature differentials we all know that Calgary is susceptible to.
Answering to the environmental impact to various roof membranes (such as freeze thaw) is a complicated topic. SBS Modified Bitumen (torch on) and Built Up Roofing (Tar and Gravel) has been a mainstay for so long, with Alberta holding to it longer than most other areas of the world. My comment to TPO or any roof membrane that is reflective or light colored is more specific to the energy efficiency of roofing systems or flat roof membranes. In Alberta, many see it as counter productive to have a reflective roof as more often than not we have our heat on than we do the air conditioning. This too is a diverse conversation. Our web site under the flat roofing section on the right column has links to articles. With respect to how each membrane will hold up specific to Calgary, that is a difficult question. TPO, PVC, EPDM single ply flat roof membranes are being installed every day in Calgary, as are the traditional SBS modified and BUR flat roof membranes. SPF – Spray Foam Roofing is another roof membrane option and then the Liquid Rubber roof membranes. At issue is that most roof membranes have not been installed for a long enough duration in the Calgary market for an excellent evaluation of performance. For example, the liquid rubber we are referring to in this instance has only been available for shy of a decade and not widely used until very recently. Our comfort is in that we simply add more liquid rubber membrane if there were to be failures. When single ply membranes were first introduced the remediation of early failures in the membrane was much more complicated than with liquid rubber roof membranes – with liquid rubber we simply apply more liquid rubber if failures were to occur. In saying all of that, we have significant liquid rubber roof membrane applied over the last 3 years with no failure to date.
6. Is a Torch on SBS system the only one which requires a ballast? Or does the liquid rubber also require a covering to reduce UV penetration, etc? Would adding Ballast prolong the life of some of these other systems?
Ballasting a roof membrane is for the purpose of keeping the roof membrane to the roof deck – wind uplift etc. For example, a ballasted EPDM roof membrane holds the EPDM down so the wind doesn’t take the membrane away. The EPDM is adhered at the seams and loose laid to the insulation or roof deck with the roof ballast (rock) covering the membrane. Inverted loos laid systems have the roof insulation laid on top of the EPDM roof membrane with the rock or roof ballast on top of the insulation. Single ply roof membranes (EPDM, TPO, PVC) can be mechanically fastened (not requiring roof membrane ballast), Loose Laid (requiring roof membrane ballast), or Fully Adhered (not requiring roof membrane ballast). With SBS Modified Torch on roofing their is no ballast required as the SBS membrane is torched or fastened to the system by way of torching or with adhesives etc. The UV is not an issue also with SBS Modified Roof Membranes as the cap sheet (or second layer of roof membrane) has granules attached that keep UV away from the Bitumen. With Built Up Roof Membranes (or BUR) the layers of bitumen are covered with an inset top layer of gravel to keep the UV away from the bitumen in the roof membranes (typically a four layer membrane system). The gravel in this instance is not for ballasting, it is only for the purpose of UV resistance. In the case of Liquid Rubber Roof Membranes, the liquid rubber manufacturers claim UV resistance with-out the requirement of granules as with SBS membranes or gravel as with BUR or Built Up Roof Membranes.
7. Do you have specific price per square foot values for each of these products, or is the quote system more complex than that (in terms of metal flashing, scupper detailing, etc.)?
Specific pricing for flat roof membranes is wisely derived after review of the construction drawings and discussion with the parties that can affect construction processes. In your instance, specific pricing for the various roof membranes can be accomplished by way of the construction drawings provided.
It seems from your email that the liquid rubber system is more costly initially and less costly over the lifespan of the roof. Can you list the roof systems according to their initial cost for installation? I am very interested in the liquid rubber system, but a little hesitant regarding the price. My understanding was that a modified Torch-on SBS was cheaper than some of the other systems, like a TPO membrane or a soprema system.
Pricing for all flat roof membrane systems are similar. Tar and Gravel Roof membranes (or BUR) will tend to be more costly due to the extensive labour, SBS Modified should be similar or perhaps a touch more than the Single Ply roof membranes (TPO, PVC, EPDM), TOUGH ROOF (which is a concept built on the strength of the traditional Built Up Flat Roof with an elastomeric top coat) would be on the higher side of the pack, and Liquid Rubber systems (if done per the specification of membrane application that we use) will be in line with Single Ply. More often than not, with roof membrane choices and pricing, you will receive varying opinions that are usually specific to what the roof membrane applicator installs most, what roof membrane the roofer is certified to install, etc. The widest divergence we see in flat roof membrane pricing is not necessarily the roof membrane material that will be used, but the process of application of the roof membrane itself and whether the flat roofing company has all the other operating costs that credible flat roof companies can have due to safety, staff remittances, benefits, company vehicles, licensing, insurances, etc.
My roof works out to be about 1150 sq. ft. (inside parapet), with the planter on the second storey being about 23 sq. ft. Would you be able to work out a few prices using the Torch-on SBS, liquid rubber, EPDM, and Soprema systems that you install?
As it applies to SBS Modified, we typically use when available to us the IKO SBS Modified Bitumen products vs Soprema. Not that we see IKO superior, it is just what our company typically uses for SBS roof membrane unless specified otherwise. I am personally a Soprema certified installer and I don’t see much of a difference either way – both IKO and Soperma produce a quality SBS Modified Roof Membrane as I see it. With EPDM, we regularly install Firestone and Mulehide EPDM (I believe Carlisle manufacturers the Mulehide EPDM, but I could be wrong). With TPO we install Firestone and Mulehide regularly also. Liquid Rubber roof membranes come in various forms, because we are installing so much of the liquid rubber roof membranes we have various specifications for application and material for the membranes. I will price yours specific to how we see it best applied and according to the manufacturer(s) we see as best for your roof membrane.
The pricing for the various roof membranes I will forward in a separate email.
Thanks again for your comprehensive response. You’ve been most helpful.
< End of Email >
Contact Us:
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.

Rooftop Patios, Decks, and Terraces

General Roofing Systems Canada provides roof repairs throughout Canada. Roof Repairs are completed in the following cities; 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.

Flat Roof Patios – Roof-Top Patios, Decks, and Terraces Roof Top Patios, Decks, Terraces

The challenge with an outdoor patio or deck on a flat roof is that the waterproofing material or membrane used on the substrate/decking has to be done perfectly. The drainage for the low slope, and the decking material put on top has to be precise

(Some patios we service are on a flat roof itself or on a terrace balcony, while others could be on a garage.)

There are various types of rooftop decks and the different waterproofing membranes that can be used. There are flat roof membranes such as 2 ply SBS Modified Bitumen, 4 ply Built up Roofing, EPDM Rubber Roofing, PVC which is a

poly vinyl chloride, TPO which is thermal plastic. There are also products that can be applied to seal a substrate such as a concrete substrate with membranes like hot applied rubber asphalt systems and cold applied liquid rubbers (elastomeric coatings etc.)

The next issue that you would face on a flat roof would be the drainage issue. All repairs would need to be done with extreme precision in order to allow the proper drainage and slop.

After you have chosen the type of rooftop deck, the appropriate waterproofing membrane for on the substrate, and the drainage is correct. You then have the issue of what you place the membrane on itself. You will need to determine if any decking material on the membrane is required. We have seen customers use a variety of surfaces on rooftop patios, with everything from ceramic tile, paving stones, treated lumber, composite tiles, to Spanish tiles and granite.

Our recommendation to those looking at repairing, installing, or replacing a rooftop patio is to speak to a waterproofing expert first. The Home Depot or Lowes store decking material associate may be able to provide some suggestions on what tile to use, yet they may not understand the proper flat /low slope roof waterproofing and drainage practices. Roof top waterproofing for a deck system is different than normal flat and everyday roofing. With rooftop decks and patios the two worlds meet. The staff at General Roofing Systems Canada can assist you in designing a rooftop patio system that should last 20 or more years. In order to achieve these results, it is vital that owners do not try to take the least costly way out. When Owners begin to cut corners in an attempt to save costs that is where the errors occur and end up being more costly later on due to future repairs.

Below we have a report that came in to the GRS office from a roof repair technician. It shows a rooftop patio that is not very old and was installed incorrectly. Due to the improper installation, the owner is now having to pay for costs that could have been avoided. As a result of this the deck material, patio’s flat roof membrane and the sheathing/substrate will have to be removed and replaced. There is even the possibility of remediation for mold and trusses being replaced.

We hope that this article will help home owners to be more aware when purchasing decking materials and to contact a waterproofing specialist first. This tip will help you to enjoy your patio/deck for years to come without the need for repair.


Flat Roof / Low Slope Membrane Information:

Initial Client Inquiry:

I have a 300 sq. ft. rooftop deck that currently is leaking.  I was wondering if I can get someone to have a look and estimate what is required to resolve the problems we are having.

Assessment, July 27 2011:

The roof top deck is having leak problems. The rooftop deck is 95% tiled. Under the patio tile is a  deck-type waterproofing membrane and then plywood substrate. The worst area of the rooftop deck is in front of the sliding doors of master bedroom. It is not tiled. The roof top deck is covered in a paintable rubber deck membrane (low cost liquid coating). Where the tile and deck meet is a metal flashing that is letting water in. The wood decking is rotted. Not sure if you can put grout on PVC decking material, I suspect when the rooftop deck was originally tiled this is probably what caused the problems. The homeowners don’t want the ceramic tile on anymore. To fix this rooftop terrace/deck it needs a whole new rooftop deck replacement. The deck needs a tear right to the substrate and inspection of the substrate wood. This terrace is unable to be repaired and will required a full re-do


Flat Roof Deck
Damage and possible Mould due to Leaking patio
Flat Roof Houses
Closer view of the mould forming due to the water damage caused by the leaking patio
Flat Roof Mold
Here you can see that the underlay and membrane have completed rotted through
Residential Flat Roof Deck
The tear in the roof top membrane which resulted in the leak
Roof Terrace
Water damaged caused to the tilling


Roof Patio
More water damage on the tilling
Roof Top Terrace
Here you can see the tile separating and lifting from the membrane


Rooftop Deck
Tiles separating: View 2
Roof Top Patio Deck Terrace
Separation along the door frame and the roof patio deck
Flat Roof Terraces
Roof deck patio prior to PVC membrane installation
Rooftop Patio
Completed PVC membrane installation

we will follow this post up if we are the contractors hired to do the repair work on the leaking patio

Until next time,

The Team 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, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

Roof Replacement Problems

General Roofing Systems Canada provides roof replacements throughout Canada. Roof replacements are completed in the following cities: 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 is an article describing the troubles that can arise with any and all roofing situations should you have with work completed improperly.
We know that every trade has its problems. Poor installations, normal deficiencies that occur, and then unprofessional workers. Unfortunately, the flat roofing trade is no exception to such occurrences.
The new home in this flat roof inspection report completed by our roofers yesterday is a victim of the exact problems mentioned above. The home in the below pictures is quite new and  was architecturally designed. However, the roof was installed poorly (2 Ply SBS Modified Bitumen) resulting in leakage. We suspect this flat roof has been leaking every time it rains or snows since it was first built.
As a result of this poor installation, the homeowners will now have to face extra costs in order to replace it all together.

Initial Inquiry:

We are looking for a replacement quote. needs repairs for torch on flat roof, client requires  the roof replacement completed within 2 weeks. Highest section of house is leaking and flat roof installed incorrectly.  Flat roof seams aren’t sealed.

Field Report, July 27 2011:

The upper smaller flat roof (SBS Modified Bitumen) on this home is completely past the point of return and a roof replacement is required . All the roof membrane seams are lifting and there is no bleed out at the membrane seams. All termination points along perimeter of the flat roof are not torched down properly. All intersections are lifting and there is no slope of roof toward scuppers. The upper roof needs to be replaced completely and should be ripped down to the deck.  It also requires a cricket (slope towards roof scuppers).

The Lower canopy roof (Modified SBS Torch On) over the main entrance of the home is in the same state as the top roof.  The roof is not torched properly, it also slopes down toward house instead of away from.  There is only one roof scupper at the high point of the roof corner which is not draining. The drainage on this roof system is very poor. The lower roof needs another scupper and or a drain in the North corner, this also needs to slope away from the house. I recommend another rip and a full roof replacement to this section also. In order to replace the roof systems we will need to take all cap and detail metal off  as it is tied into the stucco!

Flat Roof Replacement – Pictures of Flat Roof


Flat Roof
Cap Flashing

Flat Roof Houses

Flat Roof Metal

Flat Roof Needs to Be Replaced

Flat Roof Inspection

Flat Roof Repair

Flat Roof Replacement

Flat Roof

Flat Roof

Flat Roofing Repairs

Residential Flat Roofing

Until next time,

The Team 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, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

EPDM Commercial Roof Recovery System In Edmonton

GRS Canada addresses your commercial roofing needs; be it re-roofing, roof recovery, or other repairs. Our services are available in Toronto, Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler and points between.

Wednesday May 4, 2011: On Location at Edmonton, AB Commercial Re Roofing Project on Jasper Avenue. Commercial EPDM Roof Recovery System.

The photo above shows EPDM up the roof parapet walls, across the top of the parapet, terminating on the front side – giving the roof membrane a monolithic type seal. The metal cap flashing will be installed next and finish this Commercial Roof System in the coming days.

The commercial EPDM membrane installed at this site is a Carlisle EPDM Membrane labelled under the name Mulehide EPDM roof membrane.

The photo to the right shows the ISO flat roof board mechanically fastened prior to the installation of the fully adhered EPDM. The walls (parapet walls) were covered with plywood to comply with the EPDM manufacturer specifications (the parapet walls of this commercial roof are concrete). Prior to installation of the mechanically fastened ISO, the Built Up Roofing System was scraped of the gravel (Tar and Gravel Roofing) and the layers of Built Up Roofing were ripped or removed and disposed of.

The photo above shows the completed commercial EPDM membrane fully adhered to the ISO. The metal cap flashing will be placed next to both protect the parapets and also for curb appeal.

For more information about our Commercial Roofing Company and the Services or Commercial Roofing Systems we can offer, call us anytime at +1.877.497.3528.

To learn more about various Commercial Roofing Systems available follow this link:

To learn more about how to Choose a Commercial Roofing Company for your project follow this link:


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, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Banff, Cranbrook, Kelowna, Vancouver, Whistler, Winnipeg, Toronto and points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.


Calgary Flat Roof Collapses on Senior Centre

Flat Roofers Daily

Just when our flat roofers are gearing up to get the season going in Alberta, another dump of snow hits Alberta. Calgary, Red Deer, Edmonton and most of the Province. Again, a strange spring for us roofers. We’re a month behind out of the gate on our roofing project calendar, hopefully it’s a long fall 2011 roofing season – some of us will need it to complete our project calendars.

And yesterday, a flat roof collapses in Calgary under the stress of flat roof materials loaded on the roof. It wasn’t one of our roofs, but nonetheless, it’s a sure thing this will cause a lot more inspections on our sites in Alberta this year, especially in Calgary. Which isn’t all bad considering the hazards flat roofers face on a daily basis (not to mention pedestrians, people under the roof etc.)

This particular flat roof collapse is interesting because the residents of the care home were under the roof when it collapsed – in the dining hall, and – NOBODY WAS HURT! “Wow” is all our roofers have been saying all day today when they hear about the roof collapse. What a story.

Interesting timing at GRS, our new Construction Safety Officer starts next week in Calgary and our Calgary Flat Roofers have a series of Flat Roof Safety Meetings next week with Safety Certifications being updated. The week after, our Edmonton Flat Roofers go through the same stringent flat roof safety certifications and meeting with the company CSO.

For more information on the Calgary flat roof;

CTV has a story at this link on the Calgary Flat Roof Collapse

So, we’re all gearing up and hoping the fall of 2011 is long so we can get these flat roofs scheduled for this year in BC, SK, and Alberta.

And don’t forget, if you’re considering replacement of your flat roof this year [ Flat Roof Replacement ] or you need flat roof repair or maintenance [ Flat Roof Repair and Maintenance ], check with your local Better Business Bureau (BBB) to see how your prospective flat roofing contractor handles complaints [ GRS Better Business Bureau Rating ], consider all your various flat roof system options in detail [ Flat Roofing ], look in to the roofing contractor you are hiring [ Choosing a Roofing Contractor ], ask for previous flat roof projects and client references [ Flat Roof Project Portfolio ] and be sure the flat roofing contractor you hire works safe! You can check their WCB status online and ask them for their written Roof Safety Protocols and Procedures (if the have a CSO on staff this is a good sign).

Until next time,

The Team at GRS

+1.877.497.3528 (24 Hour Emergency Flat Roof Repair)

About Us

General Roofing Systems Canada installs flat roofing, repairs flat roof systems, and maintains flat roofs in Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler and points between.

GRS works on Residential, Commercial, Industrial, and Institutional Flat Roofs.

GRS is Registered, Licensed, WCB, Flat Roof Certified in numerous Flat Roof Systems and Flat Roof  Membranes, Better Business Bureau (BBB) Accredited, maintain a 5,000,000.00 Commercial Liability Insurance Package, CSO (Construction Safety Officer) on Staff, and maintain the exclusive GRS Lifetime Workmanship Guarantee on every Flat Roof System our Flat Roofers install.

Contact Us

Calgary, Alberta

Mail to:

240 – 70 Shawville Blvd. SE
Suite 1460
Calgary, Alberta Canada
T2Y 2Z3

+1.877.497.3528 Toll Free

+1.403.873.7663 Service

Edmonton, Alberta

Mail to:

3428 99 Street NW
Edmonton, Alberta Canada

+1.780.424.7663 Service

+1.877.497.3528 Toll Free

Vancouver, British Columbia

Mail to:

1489 Marine Drive
West Vancouver, BC Canada
V7T 1B8

+1.604.261.7663 Service

+1.877.497.3528 Toll Free