Installing Roofing Underlayment/Roof Membrane

General Roofing Systems Canada provides the best shingle re-roofing specifications and installation available in the roofing industry to Toronto, Calgary, Edmonton, Red Deer, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler, and points between.

Re-Roofing Right. Why not install the roofing underlayment to the whole roof deck? Why not install it correctly? And why not use a roof underlayment that actually works and does what it is intended to do in the first place?

When re-roofing, roofers have a tendency to leave roofing underlay short at the roof edge when rolling it out (wind blown rain gets to the roof deck), or at the ridge of the roof (a ridge cap shingle cracks and a roof can leak), or don’t wrap their ridges and hips in underlayment hoping the shingles will perfectly do the job , or don’t run the roof underlayment or membrane up and under roof flashings, up and under skylight flashings, and wrap or neck tie roof penetrations with roof membrane such as roof vents, skylights, etc assuming that ice, snow, and water won’t back up under shingles and cause a roof leak.

Our roofing installation specifications call for the whole roof to be wrapped in underlayment or Ice & Water peel and stick membrane, and then we don’t have to worry about wind-driven rains, ice and snow backup, and ice dams at the roof edge or in valleys – all culminating in leaks. When we install a roof, the complete roof deck is wrapped in a “monolithic” style membrane specification and the roof cannot leak.

This specification includes running the roof underlay to the edge of the roof all the way, wrapping the ridge and hips into the underlay. -No part of the roof deck shows. Even on the coast, our roofs take punishing windstorms in places like West Vancouver.

Also, the roof penetrations (goosenecks, roof air vents, etc.) have Ice & Water membrane on the backside of the opening so that when ice, snow, and water build-up (ice damming) gets under the shingles, the roof underlayment is there to protect the roof from leaking. The same principle applies for installing a membrane at the wall and up & under skylight flashings (especially to the back side). Skylight leaks are one of the most common calls our emergency leak service receives.

Our roof installers also install Ice & Water peel and stick membrane to the valleys, right to the roof deck, and then metal valley flashing is installed on top of the membrane (even if the client wants a closed shingle valley, we still put metal flashing underneath the shingles), and then Ice & Water membrane is also installed to the top of the valley flashing edges so that when ice, snow, and water backs up in the roof valleys (ice damming which in Edmonton, Fort Mcmurray, Grand Prairie, Saskatoon, Regina, etc was so bad last winter) it can’t get back under the valley metal flashing and cause a leak.

At the roof eave we install Ice & Water membrane for ice, snow, and water back up at the gutters (last winter in Edmonton we had over 500 phone calls for ice damming at the eave on residential roofs alone – in one city during one winter!) – this is a primary area of concern for ice damming issues. The membrane sticks right to the roof deck and this avoids roof rot and roof leaks at the roof eave edge.

At the main area of the roof (the roof field) we use premium synthetic roof underlayment ( Premium Titanium Roof Underlayment ) which is twenty times stronger than roof felt underlay, it is lighter than tar felt paper, is recyclable, and doesn’t crack or rip at point of installation or from UV exposure.

If you (the homeowner that is getting your new roof) watched the roofing installation crew roll out felt paper at the point of re-roof installation, as seen right from the roof top… what actually occurs would cause you to never imagine EVER installing tar paper (felt paper) under your roof shingles. It cracks when the installers roll it out! This happens before it is even installed, and then it somehow has to go up angles at skylights, etc. And then the staple hammer tackers start whacking thousands of staples into it – each time the hammer tacker hits, it also tears the tar paper felt, and if it is cold outside it is even worse, and then the shingle nailers start and on one house 7000 – 12000 roofing nails are installed right through that paper. And to top it off, if you have a shingle blow off due to wind, do you think the brittle tar paper will even stay on the roof if the shingle blew off? What protects your home at that point? WE DON’T USE ROOF TAR PAPER – FELT PAPER – ROOFING FELT on our pitched re- roofing installations period – NEVER.

“t is the best possible roof underlayment specification and installation available to a homeowner for re roofing and is a standard specification for GRS Re-Roofing Installations.

Below are photos of a re-roofing project in progress that show the various areas of “small detail” in roof underlayment and Ice & Water membrane specification that creates a great re-roof end result.

Ice and Water Membrane to Back and Sides of Roof Openings, Wall, Step
Ice and Water Membrane to back of roof openings.
Ice and Water Membrane Under Valley Flashing, On Top Sides
Ice and Water Membrane installed to roof deck and then again to sides of metal valley flashing after metal was installed. Also note membrane wraps ridge and no wood is showing.
Premium Ice and Water Underlay to Eave and Along Step Flashing
44″ Ice and Water Peel and Stick Membrane installed to roof eave area where ice, snow, and water back up at gutters and get under shingles and cause roof rot and roof leaks. Synthetic premium roof undleryment installed to roof deck. Underlayment goes right to wall and up and under step flashing at wall.
Re-Roofing, Shake to Asphalt, Underlayment Wraps Hips, Complete Roof
Premium synthetic roof underlayment to field are of roof is wrapped over hip of roof and peel and stick ice and water at eave area also is wrapped over the hip to create a monolihic type roof underlayment installation. Photo also shows roof valley prior to installation of ice and water membrane and then valley metal and then ice and water membrane installed again at edges of valley metal.
Re-Roofing, Shake to Asphalt, Underlayment Wrap, Slylight, Complete Roof
Skylight is shown with ice and water membrane installed to roof deck and up and under the flashing of the skylight. Also note the field area underlayment is synthetic and runs over the ice and water detail at edge of skylight. Photo also shows coloured flashing at skilight and ice and water membrane to back of skylight area.
Re Roofing Underlayment Right to Roof Ridge and Edge - Not Cut Short
The photo above and the two below show synthetic underlay in field area of the roof installed right to the edge of the roof and not cut short. The roof underlay also is installed right to the roof ridge and is wrapped over the roof ridge and is not left short. The goose neck is wrapped in ice and water peel and stick membrane and the plumbing stack is about to receive installation of the flashing boot, but prior to the premium Karnak bead of caulking is placed on the roof deck and then the rubber boot flashing.

Re Roofing Underlayment Right to Roof Edge - Not Cut Short

Underlay Wrapping Ridge and Under and On top sides of valley metal



  • Click for an online re-roofing quotation.
  • For more information about our re roofing installation specs you can visit our pitched roofing section of our website here:

  • To visit our main website click here.

If you have any questions about installing your shingle roof properly, or you need emergency roof repair service, or just have a simple question about your roofing, give us a call anytime. We have roofing experts available 24 / 7!

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 Repairs | Flat and Metal Coating & Restoration

General Roofing Systems Canada Repairs metal roofs throughout Canada. Metal 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.

Repairs to metal roofs are quite often due to metal seams expanding or contracting, screw holes that have expanded over time, or roof penetrations that are improperly flashed.

The first step is to assess the repairs from a repair or remediation perspective. Some high end caulking, underlayment, and flashing knowledge is required. We use a journeyman that can assess the conduct the repairs to this end.

Once the repairs are done, you may have to consider one of the many options in metal roof coatings if your roof is low slope or irreparable.

Flat Metal Roofs – Low Slope Roofing Considerations

A roof coating or restoration will likely be required in addition to the repairs, especially if you have a flat or low slope system. We often service these types in commercial and industrial facilities.

Flat roofing is more difficult as “waterproofing” becomes key. A high slope roof can be looked at as a “watershed”, so are a little easier in terms of this type of maintenance.

There are many different options for metal roof restorations/roof coatings. A proper metal roof restoration, with the right people doing the application coupled with the right materials, should get you (conservatively) about ten years or more out of your metal roofing system. As well, a high quality coating will cost you about half the price of a brand new metal roof. In the meantime, you will have another decade free to plan for your roof replacement when it has reached end of life.

The reason a roof coating or restoration is typically required when you have run into metal roof issues especially flat ones) is that the issues are most often installation or design issues that cannot be permanently fixed. Any fix we do to mitigate a roof leakage, for example, will most often be temporary repairs.

For more information on roof coatings, flat roofing, industrial and commercial coatings, and metal roof systems, visit our website for roof repair and re-roofing information. At the bottom of the main page you will find links that discuss various issues, repairs, systems, hiring contractors, and related topics. You can also search this blog by keyword using the built-in search function.

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

Welcome to our Roofing Blog.

The official roofing blog of General Roofing Systems Canada (GRS).

The purpose of this blog is for staff to enter roof repair, inspection and installation articles, reviews, news and such to a company blog on a regular basis. This blog is intended as an add-on to our main roofing website and will deliver the reader more detailed and interactive information about roofing disciplines.

We have also set up local micro-blogs regionally for specific roofing site articles that apply geographically to our customers. Here we will often refer to those local micro blogs in our articles and expound on their topics for more in-depth articles.

We hope that you become interactive with us by calling or commenting at the bottom of each article, filling out our online contact form, or emailing.

Send us your questions or sharing your experiences in an effort to further share roofing knowledge with our customers.

If you would like to be a guest contributor, contact us with your article ideas and we’ll respond as soon as possible.

A Bit About Us – Canada’s Leading Roofing Contractors:

General Roofing Systems Canada (GRS) started in 2007 as a small family run roofing subcontractor.

Over the years we have developed in to a full service exterior renovation and waterproofing contractor servicing customers from Vancouver to Toronto and all points between.

We service residential, commercial, industrial, institutional and even agricultural customers.

Our credentials and expertise are second to none. We employ journeymen red seal roofers that work on small to the largest sites in Canada for the most sophisticated specifiers, engineers, architects and companies. We are the trusted roofing contractor for millions of square feet of roofing replacements, inspections, repairs and maintenance annually.

How to Contact or Share With Us:

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

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Flat Roof Snow Removal Followup

General Roofing Systems Canada provides snow and ice removal services 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.


We are very pleased to report that all of our roofers made it home safe last night and the only buildings we heard about in terms of collapse were some quonsets, barns, and utility sheds (not to undermine their importance).

Crew at work, industrial removal
Crew at work, industrial removal

There was also a communications provider in the Edmonton area that called us with a partially collapsed metal roof system on an industrial style storage building.

Thus far, we have not heard about a home roof structure that has collapsed due to this storm we are experiencing in Alberta or Saskatchewan.

Also of note, when our sloped roofers are removing snow from residential roofs and conducting repairs, they inspect the attic space prior to check for roof ventilation problems, attic condensation that may be causing ice damming outside, vapour barrier problems, and compromised internal roof structures. We have not had any reports from the field of compromised high slope residential roofs, either.

The story is different, however, for low slope roofing systems in Alberta, Saskatchewan, and parts of British Columbia for all but residential areas. As far as homes are concerned, they seem to be holding up quite well.

This is what greeted our flat roofers on Wednesday morning when they arrived from Calgary to a site in Coaldale, Alberta:

Flat Roof Industrial Facility in Coaldale, AB
Flat Roof Industrial Facility

The flat roof service scope was to remove “some” snow and ice from a flat roof on an industrial building the size of a football fielding. One of our roofers commented that “it’s keeping our guys working and we are definitely getting into the best shape of the year.”

Our concern at this point is the volume of snow on some of these flat roofing systems. Adding the melt factor, and more snow on top of that, and the problems for these site owners will be compounded. I suppose we will just have to wait and see what transpires.

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