Roof Repair 101 – Flat Roof Repair. Materials and Option to Choose From.

Flat Roofing Repair Toronto, Mississauga, Winnipeg, Calgary, Edmonton, Saskatoon, Regina, Vancouver and all points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

July 26, 2016 by Tyler Sinclair | 1.877.497.3528 24 Hour Service

Leaky Flat Roof? Below are the options for flat roof repair and replacement.

While I write this I am looking out my office window at corner of John Street and King Street downtown Toronto and there is a massive rain storm – I am watching the water levels rise on many of the flat roofs and wondering about their drainage and how many are leaking right now.

Toronto, Roof, Repairs, Leaky
From office at 50 John Street (John and King Street) looking at likely Toronto flat roofing repairs and leaky roofs from rain storm.

Flat roofs leak. Even new flat roofs can leak because they are custom installed and expansion and contraction or improper installation can cause leaks. Storms, ice dams, the suns rays, aging low slope membranes, plugged drains, flashing problems and more can cause roof leaks.

What to do if your flat roof is leaking.

The first thing to do is to assess whether it is an emergency roof repair or if the repair can wait until the next business day (if it happens on the weekend or at night). If there is a concern with patron or pedestrian safety or the roof may collapse due to weight loads from water or snow loads then it is best to call our emergency roof repair dispatch that is available 24 hours a day.

Emergency, Roof Repair, Calgary, Metal Roof
Our roofers at an Industrial Metal Roof – Emergency Roof Repair in Calgary, Alberta.

While you are waiting for our crew to arrive to inspect and repair the leak be sure to catch any water you can coming in the ceiling with buckets and mop up the area to protect public safety (if commercial building). If the roof could collapse you may have to have people evacuate (this occurred with many buildings in 2011 in Edmonton, Alberta). If you attend to the roof be safe and always be careful with using ladders.

How Our Roofers Will Help With Your Roof Leak.

The first step is to inspect the flat roof. Our flat roofing expert will attend to your roof to assess the roof and provide you a verbal and/or written report and options for repair, replacement and pricing options.

Roof Drain, Repair, Roof, Inspection, Edmonton
Flat Roofing Repair Inspection in Edmonton, AB. Roof drain problems.

When your roof has been inspected and you have the report with costs for repair or replacement you can then make decisions. Sometimes this needs to be done immediately so our roofer will provide you with verbal inspection results and pricing and you may want to authorize the repairs at that moment.

Flat Roof Problem Areas – What to Inspect When Experiencing a Roof Leak.

When inspecting a flat roof check the sealants to be sure they are not dried out and cracked. Be sure roof drains are clear and allowing water to flow down (or scuppers and downspouts). Sometimes leaves or snow and ice can plug roof drains. Check all mechanical units such as air conditioner curbs and any roof tie-ins and parapet walls flashing.

Mississauga, Roof, Inspection, Torch-On
Flat roof inspection of torch-on roof in Mississauga shows improper installation.

A common place for problems on a flat roof are at rooftop unit curbs and flashing. Also check membrane for holes, punctures, blistering, splitting, ridging and any other irregularities.

Typical Flat Roof Repair Costs and Options

Most flat roof repairs are fast and relatively inexpensive, unless you have allowed the roof to deteriorate over the years without proper annual maintenance.

Most repairs a simple repairs to blisters on tar and gravel, torch on patches on SBS modified bitumen roofing, quick rubber patches on EPDM and for TPO and PVC roofing the repair is usually a quick heat weld to seams or rooftop penetrations.

Metal roofs can usually be repaired and maintenance with roof coatings and spot repair to the fasteners, seams and rooftop vents.

Metal Roof Leaks, Coating, Liquid Rubber, Regina
Liquid Rubber Roof Coating in Regina Repairs Metal Roof Leaks for a Reasonable Cost.

Materials Available for Flat Roofing

Modern membranes include many options not available when most flat roofs in Canada were originally installed. Over recent decades there are many options beyond traditional built-up tar and gravel.

Our main website has a complete article dedicated to flat roof membranes.

When we prepare pricing for flat roof repairs and replacement we include all options. Some are as follows:

Tar and Gravel, Roof
Picture of a tar and gravel flat roof on mall in Calgary.

Tar and Gravel Roofing (Built-Up).

Tar and gravel is the standard flat roof (old school style) you may have seen. There are pebbles (pea gravel) on top to protect the layers of mopped on bitumen from the suns UV rays. If the rocks are larger then it is not likely a standard tar and gravel built up roof (BUR) – it is most often a ballasted EPDM or inverted roof system.

Torch-On Roofing (SBS Modified Bitumen).

Torch-On, Membrane, 2 Ply, Toronto
Picture of 2 Ply SBS Modified Bitumen Torch On Roof Membrane in Toronto, Ontario.

SBS modified can also be applied as a cold application or mopped on. Typically SBS Modified is torched on however.

This product choice is newer than tar and gravel systems and comes in rolls that are usually torched on. The granules are on top and many customers refer to it as the shingle looking roll style when they call me for service.

Single-Ply Membranes.

EPDM, Membrane, Single-Ply
Picture of an Edmonton EPDM roof on a commercial building.

Next came the single ply roof membranes. Standard in Canada are EPDM, TPO and PVC.

EPDM is a rubber roll usually 10 x 100 (but comes in many sizes) that is applied by way of glue, mechanically fastened or with rock ballast (a rock similar to river rock). The picture to the right is a fully adhered EPDM membrane in Edmonton, AB on a commercial property.

TPO and PVC.

TPO, Membrane, Vancouver
Vancouver TPO roof inspection shows improper welding of seams.

TPO (thermal plastic olefin) is another type of single ply membrane and is usually white in color. The rolls are welded together with a heat welder vs. using adhesive as with EPDM (above).

PVC (poly vinyl chloride) is similar to TPO and the seams are welded in the same fashion as TPO. The chloride in the PVC caused some issue with the market when it was released so TPO was brought to market shortly after.

Roof Coatings. Fluid Applied.

Another category of products are the liquid applied products such as liquid rubber (which is a cold application coating), Spray Foam (SPF) and there are also hot applied rubberized asphalt coatings.

Liquid Rubber, Roof Coating, Metal, Industrial
Leduc, AB. Roof Coating being installed on an industrial metal roof (liquid rubber).

Liquid rubber / elastomeric roof coatings are typically used to coat metal roof systems. Liquid rubber is available in various colors.

In Canada it is best to stay with a darker coating but lighter coatings such as white and reflective are also available. You can click here to learn more and visit our roof coatings repair website.

And finally spray foam (SPF) is available which is a spray foam that is applied over top of the roof and a coating (usually polyurea but also silicone and liquid rubber are used) is sprayed on top of the spray foam.

Spray Foam, Roof, SPF, Cracking, Peeling
Leaking spray foam roof (SPF). Top coat on spray foam was not applied properly and it is cracking and peeling.

The biggest challenge with spray foam roofing in Canada is that spray foam expands and contracts and the top coating can peel if not the right top coat or if done improperly. Be sure you have a good contractor if you choose spray foam – it has to be right or there can be big problems.

Our inspection report and pricing options will detail the pros and cons of each product and provide pricing for each membrane type. Our quotations also provide pricing details for replacement of insulation, metal flashing for parapets and deck (substrate) sheathing if required.

Toronto green roof installed at 80 Front Street East.
Green Roof at 80 Front St E in Toronto.

Eco Roofing.

Eco-roofing is a green roof (low slope / flat roof) that supports vegetation or is a cool roof (reflective white roof) that reflects the sun’s thermal energy away from the building.

A green roof (eco friendly) is one that has growing vegetation over a significant proportion of the area of the roof. Water and energy conservation is the goal with a green roof. The low slope assembly is made up of a waterproofing membrane (such as above – EPDM, TPO, or PVC), a drainage layer, an organic growing medium (soil) and vegetation.

A cool or white roof is one that reflects solar and thermal emissivity and reduces heat build – up in the building. A white reflective roof (or cool roof) is applied as a coating over an existing system such as a low slope metal roof or over an existing or new waterproofing membrane (listed above) on a flat roof.

Toronto has grants for green and cool roofs. Since 2009, the City of Toronto’s Eco-Roof Incentive Program has helped fund the installation of more than 100 green and cool roofs on buildings across the city. You can find the Toronto Eco Roof program here.

Patio Membrane - DecTec Installed at Condo on 100 Ave in Edmonton.
Google Earth Image of Balcony Membrane Repairs at 11618 100 Ave Edmonton, Alberta – DecTec Rooftop Patio Membrane

Balcony Waterproofing Membranes / Rooftop Decks / Patios.

If you have a balcony membrane that is leaking (also used on rooftop decks or patios) our journeyman install material such as DecTec to deck areas.

If your deck or patio is above a living area (including a garage) then you need a waterproofing membrane material such as DecTec (a PVC product) that is suitable as both a flat roof and a patio membrane. It is very important to choose a material that is suitable for both uses.

Conclusion

If your flat roof needs repair or replacement my best suggestion is to be sure that you are provided with ALL options for replacement material and methods. Ask for a complete and detailed report and pricing explaining the pros and cons of each material type and method.

For more reading I will direct you to our main website at www.grscanadainc.com or visit these links:

Wikipedia –  https://en.wikipedia.org/wiki/Flat_roof

Different Types of Flat Roof Material Options – http://homerepair.about.com/od/exteriorhomerepair/ss/Types-of-Flat-Roof-Materials.htm#step1

Thank you for considering us for your roof repair needs! Call anytime 1.877.497.3528 and speak to our local expert in your area.

Cheers!

Tyler Sinclair

Flat Roof Repairs in Toronto, Mississauga, Winnipeg, Calgary, Edmonton, Saskatoon, Regina, Vancouver and all points between. British Columbia. Alberta. Saskatchewan. Manitoba. Ontario.

 

Metal, Membranes, and Roof Shingles for Low-Slope Systems

General Roofing Systems Canada installs IKO shingles throughout Canada. Installations 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.

Edmonton Flat Roofing Repair

When completing low slope re-roofing systems it is important to take into consideration the correct election of material that adheres to the local building codes and material manufacturer’s specifications.
Below we have provided a guideline for low slope shingles, roof membranes of flat roofs, and metal roofing.

Low Slope Roofing Shingles

Serious thought is required when you are considering re-roofing a roof that has a slope that is less than a 4/12 pitch. Malarkey Roofing

For roofing with a 3/12 pitch regular shingles can usually be installed with 2 ply 15 lb roofing felt paper as underlay ( Be sure to check with your specific building code and the shingle manufacturer).

The General Roofing Systems Canada (GRS) specification for how to install roofing shingles is to never use felt paper. We prefer to use Ice & Water protection on eaves, valleys, and around chimney flashing.  In addition to Ice & Water,  we also use a  synthetic roof underlay such as titanium.

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

IKO Shingles

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.)

Low Slope Roof Membranes (Flat Roofing)

General Roofing Systems Canada (GRS) Edmonton Flat Roofers

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

  1. Single Ply Membrane: Single ply membranes come in the form of EPDM (rubber), TPO (Thermal Plastic), or PVC (Poly Vinyl). Single membranes are either fully adhered, mechanically fastened, or ballasted.
  2. Two Ply Membrane: The primary two ply membrane is the SBS Modified Bitumen that can be torched down or cold applied.

  3. Built up Roofing: Built up roofing is another way of describing multi-layer roofing. An example would be the traditional  roofs tops that are commonly referred to as tar and gravel roofs or flat-top tar roofs.

  4. New Built up Roofing: More recently, modern technologies have advanced the built up roof and newer built up flat roof systems. They now utilize environmentally friendly products and modifiers vs. the tar or bitumen that has been more commonly used in tar roof systems. The newer versions of built up roof systems are extremely tough and will outlast almost any other roof. They are VOC free, making them perfect sustainable offerings to low slope roof assemblies. Tough Roof is an example of the modern built up roof systems as is the GRS Liquid Rubber Built up Flat Roof (a four layer voc free engineered liquid rubber flat roof with 800% elasticity and contains environmentally friendly synthetic fabric between layers vs. traditional tar felt paper.

Low Slope Metal Roofing

Roof Coating, Industrial Roof, Metal Roof, Leduc II

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

With residential buildings, metal roofing is more typically found on steeper  roofs. GRS installs several of metal roofing systems to Mountain villages such as Whistler, Squamish, Canmore, Banff, Cranbrook, Fernie, etc.  More and more metal panel and metal shingle roof residential installations are growing,yet the greatest volume of metal work being completed is on industrial facilities.

An issue with this type of roofing is that there is no other form of roofing material that expands or contracts as much as the metal roofing does. The seams between the roof panels, the fasteners, roof openings at vents, chimneys, flashings, and skylights are consistently expanding and contracting . Due to this factor metal roofing systems are prone to leaks.
Another issue with the metal roofing systems is condensation.  Many roof leaks in homes or businesses are actually not leaky roofs, they in fact a pooling of water in the ceiling due to condensation.  It is important to deal with any condensation or leak issue before installing a new metal roof.
We are able to solve the problem of metal roof leaks by installing a premium roof membrane under the metal roof system. We use a premium caulking tape at the seams in addition to using hidden fasteners. Now one effective way to solve the potential of leaks or condensation issues is to torch a SBS modified membrane or spray liquid rubber before putting the metal roof on.

For a commercial roof and industrial metal roof that is leaking, typically we would coat the roof with liquid rubber. By doing this it helps to ensure that the roof  will be good for another 10 years or more. Trying to locate metal roof leaks and deal with them in an isolated way can be quite time consuming and unfortunately highly frustrating . For more information Click on the following link to go to our roof coating section of our website.

Until next time,

The Team at GRS

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

info@grscanadainc.com

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.

 

Re-Roofing? Consider Converting a Flat Roof to a Pitched Roof

General Roofing Systems Canada re-roofs low slope residential roofing systems throughout Canada. Our roofing services are available in Toronto, Calgary, Red Deer, Edmonton, Lloydminster, Saskatoon, Regina, Medicine Hat, Lethbridge, Canmore, Kelowna, Vancouver, Whistler and points between.

Low Slope Shingle Re-Roofing to Flat Roof Membrane Edmonton, AB

Low Slope Roof Membranes

One common challenge homeowners have when considering re-roofing a flat roof or a low slope roof on their home, and we receive many inquiries about, is homes with a low slope pitch that currently have shingles on the roof and the homeowner is considering a conversion to a flat roof membrane when they re-roof instead of the shingles, or homeowners considering converting a flat roof on their home to a pitched or sloped roof instead.

Some considerations for low slope re-roof planning for your home:

Low Slope Residential Re-Roofing

Today there are many more options than once available for homeowners considering flat roof or low slope roofing membranes for re-roofing. We can remove the shingles on your home and apply a number of different systems.

Homeowners call us with concerns over the cost of low slope or flat roof membranes (relative to shingles) and this becomes a serious consideration when planning for a residential re-roof project.

Low slope roofing has changed and many options are now available for re-roofing your home that are much less costly than the traditional low slope tar roofing or torch down roll roofing.

The other thing that homeowners often call about is taking a low slope or a flat roof and having it turned into a pitched roof or a high slope roof instead of a flat roof.

Today, solutions are available for low slope residential roofs that don’t require the cost of traditional flat roofing or the expense to go from a flat roof to a pitched slope roof on a home.

Newer low slope roofing membranes are “single ply”. EPDM is a single ply low slope roofing membrane that has a 20 year membrane warranty (the membrane warranty is available for residential re-roofing as well as commercial re-roofing) and some flat roofers will tell you they expect the newer single ply roofing membranes to last 30 or 40 years, TPO is a single ply low slope white roofing membrane, PVC is similar to TPO in that it is single ply and white, and then there are the older style systems being the torch down sbs modified bitumen roofing membrane (or roll roofing) and Tar and Gravel flat roofing. All of these systems work on low slope re-roofing projects. And finally, there are metal roof or steel roofing systems for low slope re-roofing and even shingles for slopes to about a 4/12 pitch. Some roofing contractors are applying low slope shingles to 3/12 but we consider it tentative.

The residential low slope roof in the pictures of this post are of a residential low slope roof that we are re-roofing this week. The low slope shingles are being torn off and replaced or re-roofed and converted to an EPDM flat roof membrane. The EPDM roofing membrane system carries a 20 year manufacturer warranty. Also in the re-roofing process, we are removing the sheathing from this home and an attic insulator is blowing in insulation, then we are re-sheeting and adding a low slope insulation board, and then EPDM low slope roofing. All the roof flashings are being replaced in the re-roofing process – the eave, gable, chimney etc will be replaced as will all roof penetrations. The two low slope skylights are being replaced. The venting of this low slope re-roofing project will be re designed and installed at the ridge or peak of the roof with a custom made ridge ventilation system that will have a curb framed in first and then the ridge vent along the ridge. This will allow for proper attic/roof space air flow and ventilation, it will keep snow from covering the ridge vent, as well the custom framed curb for the vent will keep snow from entering the roof system.

You can follow this residential re-roof project by checking back regularly on our roofing blog as we will post pictures showing the process of re-roofing from a low slope shingle roof to a low slope flat roofing membrane.

If you have any questions about low slope roof membranes or re-roofing you can call us any time at +1.877.497.3528 or email us at info@grscanadainc.com or click here to fill out an online roof repair or replacement request form.

Until Next Time,

The Team at GRS

CONTACT US:
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

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

CONTACT US:

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

 

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.

Waterproofing: https://www.grscanadainc.com/Waterproofing.html

Flat Roof / Low Slope Membrane Information: https://www.grscanadainc.com/Flat_Roofing.html

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

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

info@grscanadainc.com

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