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FLAT ROOF EDUCATION

Flat Roof Education

Flat roofs, or "low-slope" roofs, are commonly found on commercial and industrial buildings around the world. They maximize space in structures that need to contain large mechanical units. The National Roofing Contractors Association defines a low-slope roof as having a slope of 3-in-12 or less. Flat roofs typically consist of a Single Ply roof system or an Asphaltic roof system, and are very different from residential roofs.

Commercial and Industrial flat roofs require a high level of expertise and workmanship to be installed properly and reach their serviceable life. Given the magnitude of what is protected by the roof in commercial spaces, it is crucial that you choose the best system for the building type and location, and ensure that it is installed correctly by a certified flat roofing contractor.

Over 80% of flat roofs are replaced prematurely due to lack of preventative maintenance and incorrect installation.
  • TPO (SINGLE PLY)  
  • EPDM (SINGLE PLY)
  • PVC (SINGLE PLY) 
  • MODIFIED BITUMEN (2 PLY)
  • BUILT UP ROOF (4 PLY)
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The first sheet was installed in 1986 and today TPO roof systems are the fastest growing commercial roof membrane on the market. Thermoplastic Polyolefin (TPO) is a single-ply reflective roofing membrane made from polypropylene and ethylene-propylene rubber polymerized together. It covers tens of millions of square meters on roofs worldwide.

Common Applications
  • Fully Adhered
  • Mechanically Fastened
    ​(Traditional or Heat Induction)

Common thicknesses range from 60mil to 80mil membranes.

​Industry Standard colours range from White to Tan to Gray. Custom colours available upon request.

Life Expectancy ranges from 15 - 25+ years depending on preventative maintenance by a certified flat roofing contractor. ​

Pros:
  • Cost effective
  • Offers high SRI Value
  • Ease of Installation
  • Durable, flexible & versatile
  • Recommended for regions with more Cooling Degree Days
  • Reduced cooling costs and carbon emissions
  • Non Toxic, 100% recyclable
  • Heat Welded Seams (result is a fused seam that’s stronger than the field of the membrane.)​
TPO Single Ply Illustration

​

​Common Building Uses:
  • Retail Buildings
  • Office Buildings
  • Commercial / Residential Buildings
  • Distribution Centres

Manufacturers we recommend:
Carlisle, Firestone, GAF

EPDM, also known as Ethylene propylene diene monomer, is a versatile, synthetic rubber roofing membrane. It has been used on commercial roofs for over 50 years and over one billion square feet is installed annually worldwide. Originally used as pond liner, the EPDM membrane has proven to be one of the most reliable roof systems available today - it is highly economical, extremely flexible, and weather resistant. With a potential life expectancy of up to 50 years, this alternative is hard to ignore.

Common Applications
  • Ballast
  • Fully Adhered
  • Mechanically Fastened
EPDM Single Ply Illustration
Common thicknesses range from 45mil to 90mil membranes.

​Industry Standard colours are Black or White. Custom colours available upon request.


Life Expectancy can range from 20 - 30+ years depending ​on preventative maintenance by a certified flat roofing contractor.

Pros:
  • Ease of installation
  • Extremely durable and flexible in ALL weather conditions
  • Low life cycle costs
  • Non-Toxic, 100% recyclable & reusable
  • Recommended for regions with more Heating Degree Days
  • Reduces heating costs and carbon emissions.​
Common Building Uses:
  • Manufacturing Buildings
  • Industrial Buildings
  • Office Buildings
  • Distribution Centres

Manufacturers we recommend: Carlisle, Firestone
Polyvinyl chloride (PVC) is a trusted membrane that has provided decades of waterproofing protection in Europe and North America. PVC is popular for its dependable, heat-welded seams; high reflectivity; superior physical attributes; and resistance to ponding, chemicals, grease, fire and punctures. That being said, it can be one of the more costly roof systems to install. 

Common Applications
  • Fully adhered
  • Mechanically fastened

Common thicknesses range from 48mil to 80mil membranes.

​Industry Standard colours range from Gray to Tan to White. Custom colours available upon request.


Life Expectancy ranges from 20 - 30+ years depending preventative maintenance by a certified flat roofing contractor.
PVC Single Ply Illustration
Pros:
  • More flexible than TPO
  • Offers high SRI value
  • Strong puncture resistant material
  • Superior resistance to chemicals, chemical fumes,
    greases, acids, oils, and many kinds of fuels
  • UV resistant
  • Non-Toxic, 100% recyclable
  • Heat welded seams (result is a fused seam that’s
    ​stronger than the field of the membrane.)
    ​
Common Building Uses:
  • Sport Arenas
  • High Angle Change Buildings
  • Recreational Buildings

Manufacturers we recommend:
​Carlisle, Sika, GAF
In the early 1960's, a Modified bitumen roof system was introduced by leveraging the proven performance of BUR and adding roof wear layers or "cap sheets" that are polymer reinforced for strength and durability. It can be installed with the common torch method, asphalts, cold adhesives, and self-adhered. A standard SBS Modified Bitumen roof system is a 2-Ply system applied in rolls that overlap. These membranes are an innovative modification of the classic BUR system, eliminating more than two plies required to complete the membrane. This reduces labour and material costs.

Industry Standard colours range from Black to Brown to White. Custom colours available upon request.

Life Expectancy ranges from 10 - 20 years depending preventative maintenance by a certified flat roofing contractor.
Modified Bitumen (2 Ply) Illustration
Pros:
  • Factory applied mineral surfacing for consistent protection layer on cap sheet
  • Overlapping rolls create larger seamless areas
  • Polymer reinforced roof wear layer provides better elasticity and flexibility in low temperature
  • Durability against traffic
  • Lower cost to Built Up Roof
Common Building Uses:
  • Manufacturing Buildings
  • Industrial Buildings
  • Office Buildings
  • Commercial-Residential Buildings

Manufacturers we recommend:
​Soprema, IKO
Also known as BUR or "Tar & Gravel," Built Up Roof systems have endured for over 100 years. They are generally composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane, followed by a top layer of embedded gravel and a flood coat of asphalt, then loose gravel to complete the system. This is designed to protect the roof membrane from traffic and UV rays. Built-up roofing (BUR) was the most common type of flat roof type until single-ply roofing and modified Bitumen was invented.

Industry Standard colour is generally black with Gray/White Gravel ​on top. Custom colours available upon request.

Life Expectancy ranges from 10- 15 years depending on preventative maintenance by a certified flat roofing contractor.
Built Up Roof (4 Ply) Illustration
Pros:
  • Thick multiply protection mat
  • High resistance to damage and foot traffic
  • Easy to maintain
Common Building Uses:
  • Manufacturing Buildings
  • Industrial Buildings
  • Office Buildings
  • Commercial-Residential Buildings

Manufacturers we recommend: Soprema, IKO
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  • HOME
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  • ABOUT
    • WHY ALLIANCE?
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