Re-Roofing Roof Shingles The Right Way

General Roofing Systems Canada Offers Expert Re-Roofing with our Exclusive GRS Re-Roofing Specifications in Toronto, Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler, and points between.

GRS Canada has an unusual residential re-roofing specification standard – interestingly enough… it works!

Ask us for re-roofing client references that will tell you all about how our systems keep their homes completely, perfectly water tight without any concern.

Re-Roofing With Premium 44" Ice and Water Underlay to Roof Eave and Wall
Re-Roofing With Premium 44″ Ice and
Water Underlay to Roof Eave and Wall

In the photo above, a premium 44 in. Ice & Water membrane (IKO Goldshield Ice and Water Protector) is applied at the roof edge (eave) and to the wall area to the deck and up & under the step flashing onto the wall. The roof eave protection avoids backup from water and ice at the eaves-trough during freeze, thaw, and ice damming. The ice and water membrane is a peel and stick self-adhered membrane that sticks to the roof deck, blocking ice and water penetration, thus mitigating roof rot. The Ice & Water under the step flashing at the wall and up the wall also protects the deck, wall, and vapour barrier from ice and water penetration.

When Re-Roofing Our Roof Underlayment Wraps Hips and Ridges
When Re-Roofing Our Roof Underlayment Wraps Hips and Ridges

Also of note in the photo is the high gauge coloured metal eave drip edge flashing (GRS re-roofing standard), the wall area step flashing (galvanized metal that meets the wall) will be coloured when the re-roofing process is complete as the profile of the previous pine shakes were higher than the new laminate shingles, and finally of note in this photo is the ultra premium synthetic underlayment  (Titanium Synthetic Underlayment) to the rest of the roof deck (also a GRS standard re-roofing specification).

Titanium synthetic roof underlayment is many times lighter and twenty times stronger than standard roof felt. It doesn’t break down like felt in UV, doesn’t expand/contract or get brittle like roofing felt, contributes to LEED points, and is 100% recyclable.

The photo to the right shows an Ice & Water membrane to the back side of the gooseneck roof vent and to the top side areas, and again this membrane is along the wall and step flashing of the roof (GRS standard).

Ice and Water Membrane to Back and Side of Roof Openings
Ice and Water Membrane to Back
and Side of Roof Openings

Under that gooseneck vent is a premium Karnak caulking bead for added protection.

Have Ice & Water “necktie” all roof openings avoids ice/water backup under the shingles at the back of the vent area and under the vent onto the roof deck and into your attic and home. That is the number one repair our technicians undertake when repairing shingles roofs – likely 8 out of every 10 emergency roof repair calls we receive in sloped shingle roofing is for this reason (or some form of underlayment deficiency).

The photo to the right shows another GRS specification. A premium 44 in. Ice & Water membrane is applied to the roof sheathing in the valley, then a high

Re-Roofing Master Spec - Ice and Water is applied to the roof deck, then high guage valley metal (coloured) and the premium ice and water membrane to edges of valley metal to ensure "monolithic" type seal.
Re-Roofing Master Spec – Ice and Water
is applied to the roof deck, then high guage
valley metal (coloured) and the premium
ice and water membrane to edges of valley
metal to ensure “monolithic” type seal.

gauge coloured metal is applied over the membrane. For extra confidence, a “monolithic” type roof seal is created using another Ice & Water application to the edges of the valley metal. The premium synthetic roof underlayment is then run into the valley area.

If the metal has a crimp at any point, and when the metal expands and extracts (which metal does), it happens to snap – this is where a lot of roof leaks occur. When this occurs, we do not have to worry about this as our metal is a heavier than normal gauge and should not snap, but we also have a premium quality membrane underneath the metal valley.

Also, if ice and water backs up in our valleys and gets under the shingles, which regularly occurs, we have yet more sealant again at the edges of the valleys, which seals the roof valley. In this way, it cannot leak, as water cannot get around the side of the valley metal to the roof deck.

Finally, even when we close the roofing valley with shingles, we still use this underlayment re-roof specification so that when the roof shingles fail in the valley from age or when someone walks on the shingles in the valley, we then have the Ice & Water and metal underneath the shingles. We apply this method when some homeowners want a re-roof to show only shingles and no valley metal in the roof valley. Our specification mitigates shingle deterioration in the roof valley area first, as that is where most roof water runs and ice builds up.

Our website has an extensive section (it is actually the shingle re roofing installers installation manual) that details our re-roofing how to and the specifications of re roofing our installers are held to at this link:

When deciding who you are going to choose as your Re Roofing Contractor we have compiled a check list here:

We also are proud of our Re Roofing Installers and have prepared a document explaining how our re roofers are different here:

Contact us today for a roofing quotation.

And remember, our company has expert re-roofers on call 24 hours, 7 days to answer roofing questions you may have!

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


Metal Roof Repair or Replacement?

General Roofing Systems Canada provides metal roof replacements throughout Canada. Metal 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.

Metal roofing is a vague word in the roofing world as it can be used to refer to a variety of systems. There are metal roof shingles, steel shingles, metal slate profile shingles, metal shake-looking shingles, metal panels, standing seam metal roofing, corrugated metal roofing, metal roof tile that are coated with granules… you get the point. The options in metal roofing are almost endless now.

One consistency that remains among the variety available to you is this: metal roofing can last longer than any other kind of roof’ however, a metal roof that is installed incorrectly will only last as long or be as durable as the workmanship of the install. If the underlay, or the venting of the roof system/attic is not correct, then problems such as leaking and ice damming will occur. With the weather that we have been receiving this year, one might see their metal roof may leak in multiple locations as time goes on. It is a frustrating experience living under a metal roof that has not been installed correctly.

To Repair or Replace?

Yesterday we had an inquiry come into our call center that is very common for us to receive. We felt this particular case would be a good addition to our blog in an attempt to help clients in their future endeavours while completing roof projects. 

On Monday, Jul 25, 2011 at 1:27 PM, the client wrote:

We have an interlocking style metal roof that was installed by company 5 years ago by the previous owners.  The roof leaks in the winter as a result of ice damming in the valleys, and in the spring shingles annually become loose (and have blown off) on the edge of one of the valleys from the ice sliding off.  I am tired of dealing with the company (long story) and we are wondering if there is any way to repair rather than replace what they did.  We have a log house with cathedral ceilings so I suspect we need to try to improve the airflow under the existing metal shingles. I don’t know what it looks like between our open ceiling and the metal shingles above (regarding insulation and air flow). There is no venting other than vented soffits (as far as I can tell). Is there any way to seal the metal shingles so water doesn’t flow back up under them?  I don’t know if any waterproof barrier was used in the valleys and I don’t think the roof was installed very well in some parts. After talking with the previous owners a couple years ago, I know they weren’t satisfied with the installation of the metal roof, but they ended up having to relocate before going through a winter.
A couple of other things to note;  a few of the metal shingles were damaged when we were trying to remove the ice from the roof this past winter, and when we had heavy rain, the water comes off the roof before making it to the eaves.
I attached a couple of pictures of the roof so you can see the design.
Based on these pictures, if we had to replace our roof, what would be our best options (type of shingles, venting, etc.), and how could we reduce the potential for ice damming and leaking? How much would you estimate replacing a 1400+ sq. ft. home’s roof with different types of materials?  Is there a guarantee on the ice damming/leaking after the roof has been replaced? Is there anything else I need to know or can I provide you with more information?
Our Response:

Good morning,

I’m the Project Manager for GRS. I travel across Alberta solving roofing problems. However, it’s peak season and I may not be able to get out and take a look as quickly as I would like. That being said, what I am going to do is send this email to our two senior sloped technicians/foremen at GRS as well as our scheduling manager.
Our scheduling manager will keep you informed on our work in progress, and either myself, or one of our foremen, will come out to meet you. In the meantime, I’ll offer for them to chime in their input based on your email and photos (great email by the way – it helps us a lot).
Here’s is my opinion in regards to your questions….
1. From the perspective of someone that sees literally thousands of roof problems a year, my first advice would be to not listen to just any idea of repair from just anyone. Metal roofing is a specialty. A very common thing we see is homeowners trying different “metal roof” contractors in haste and it tends to end with negative results. Both of our foremen are very senior technicians that would not have you running around a circle. If we don’t get to you as soon as you like, and you hire someone else, please make sure to validate the experience of the technician. It would be more beneficial to be thorough with your next selection as any experienced person can rattle off hundreds of client situations and references. In our case, we lay out our experiences on our blog to provide our clients and future clients with quick and easy access to references.
2. I think the end result of your situation is going to be a new roof replacement. Now I understand this is not what you want to hear, and you may find it convenient in a consumer’s mind for me to say.  However, I will explain the reasoning behind my conclusion. We don’t need to sell you a roof, we’re always over-booked so the motive isn’t there. Secondly, we see these installation issues all the time; our blog is full of how to do it right – and when it isn’t done right, it is almost impossible to correct. However, in saying that, both myself and my technicians may assess your building and be able to find a less expensive solution.
3. Based upon your descriptions, I am thinking that it is an inherent design/installation issue. Metal expands and contracts and is a water shed system – not waterproofing. The roof underlay installation is flawed at the valleys. At minimum, I would think the valley areas would have to be ripped out (probably 5 feet on either side) and proper underlay installation executed and metal tiles put back in or new metal tiles placed.
4. Even after doing all that, it is a low slope roof, and you may have intermittent issues either way. That is how I end up at the roof replacement as an end result.
5. With respect to ventilation, that likely could be assessed over the phone with one of our foremen.
So I may not have helped or may have, but the bottom line is that typically the best thing to do is to start over with a roof replacement. Get the underlay, the ventilation and the water shedding product right. Once this has been completed, I believe your issues will be resolved.
 Client Response:
Thank you for replying so quickly.  I suspected that we would have to replace the roof.  This isn’t a rush job, but if we could get it done before snowfall, that would be great. If we have to over-winter this roof again, is there anything we could do in the valleys temporarily? Like heat cables or….? The interior log walls got water staining on them last year and I am concerned with the condition of the wood below the metal tiles in the valleys.  In the case with a low sloped roof, would asphalt shingles be a better alternative to metal?
Please put me on the waiting list for an assessment.
Our Response:

Good morning,

No problem. The day’s just getting going here so I had the time.
With respect to roof replacement before winter, yes this is very possible. However, I would like either one of my foremen or myself to look at your property prior. I would like to make an attempt at finding a less expensive solution.
If for some reason you were thinking of not approving the work before winter, heat cables aren’t a good solution. Short of using a high quality tarp on your whole roof, it won’t help.
Metal roof systems are fine as long as the underlay is correct. Shingles won’t leak as easily, but don’t last as long. Any roofing product will work as long as the roof underlay and venting is correct.
We will get out to your property as soon as possible to meet you and take a look.

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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.

Chimney Roof Leak Repair

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. Roofing,

Roof Repair Field Report
Date: July 23, 2011
Location: Calgary, Alberta
Roof Type: Shingles, Sloped, Residential
Problem: Chimney Leaking from Roof Top

 Roof Repair – Technician Report “How to Repair Roof Leak from Chimney”

A client of GRS was experiencing a leak in there roof and requested a full repair. Upon observing the roof and the chimney, our technician determined that the cause of the leak was isolated to the chimney area.

Our technicians replaced the chimney back pan that another company had serviced over a year ago. Despite having been serviced not long ago, the client was still experiencing leaks.

For this particular roof we were able to complete the following repairs: remove shingles from the area around the chimney, remove the siding from the chimney, remove the old metal roof back-pan at the back of the chimney, install a premium roof underlay (ice & water shield) on both sides if the chimney onto the top step flash and on the front – running the ice and water roof underlay up the chimney approx 8″. Installed the new chimney back pan, replaced shingles and siding.

Roof Repair Pictures “How to Repair Roof Leak from Chimney”

How to Repair Roof
Damaged chimney
Roof Repair How to
Roof Underlay installed around chimney area.
Roof Repair Roof Leak
Metal Flashing – Chimney Backpan installed after underlay.
Roof Repair, Chminey Leak
Roof Underlay (Premium Ice and Water” to back of Chimney
Roof Shingle Chimney Repair
Ready for siding to be re-installed on chimney after
Roofing Repairs, Chimney Leaks
Roof Repair Completed, Chimney area no longer leaks.


Other GRS Roof Repair and Roof Replacement Links and Documents

Roof Repair Page :

Choosing a Roofing Contractor for your Roof Repair or Replacement

What Makes our Roof Replacement Shingle Installers Different – Lifetime Workmanship Guarantee


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