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  • Single Ply Membrane

    The expectations of single-ply membranes should be that it:

    • 1m

      is a waterproof sheet

    • 1m

      must be non-flammable

    • 1m

      must comply with building codes

    • 1m

      must be easy to work with and repair

    • 1m

      must be pliable at different temperatures

    • 1m

      must be weldable

    People have been given the impression that all single-ply membranes are alike. Nothing could be further from the truth. Just because they are called single-ply membranes does not mean that they will perform the same.

    Since 1975 a wide range of Thermoplastics and Thermosets have been used for single ply roofing materials e.g. CPE, EPDM, Hypalon, TPO, PVC & CPA are just a few.

    Thermoplastics PVC/TPO Single Ply Thermoplastic single ply membranes are revolutionizing the commercial and industrial roofing industry. They represent the fastest growing segment of the Canadian roofing market over the past five years. The PVC (polyvinyl chloride) product is a reinforced membrane with tough solvent-or hot-air welded seams. This material has excellent durability and dimensional stability. Both PVC and TPO are aesthetically pleasing, lightweight, highly reflective, and are tear resistant. They also offer excellent fire resistance. Guycan Ltd. is proud to specialize in both of these technically advanced roofing systems.

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    TPO’s, however, are relatively new and do not have adequate performance history to make a concise judgment. TPO’s, as a roofing product, have only been around in Canada about ten years and “As yet, little is known about their durability.” Ralph M. Paroli, Technical advisor report Feb/Mar 2000.

    Recently GAF (manufacturer) recalled its TPO2 product. According to a newsletter article from the NRCA dated 6/8/01 “GAF Materials Corp. (GAFMC) has announced that it will discontinue production of its new EverGuard® TPO² Plus product…

    Thermoplastics PVC/TPO Single Ply Thermoplastic single ply membranes are revolutionizing the commercial and industrial roofing industry. They represent the fastest growing segment of the Canadian roofing market over the past five years. The PVC (polyvinyl chloride) product is a reinforced membrane with tough solvent-or hot-air welded seams. This material has excellent durability and dimensional stability. The TPO (thermoplastic polyolefin) product advances the category yet another step by combing the hot-air welding benefit of PVC with the greater flexibility and weatherability benefits of EPDM, the more traditional single ply material. Both PVC and TPO are aesthetically pleasing, lightweight, highly reflective, and are tear resistant. They also offer excellent fire resistance. Guycan Ltd. is proud to include all of these new and technically advanced roofing systems.

    Cool Roofs

    The two most important factors in achieving a cool roof are Reflectivity and Emissivity. Reflectivity is one key measurement of energy performance when evaluating for a cool roof. Reflectivity is the percentage of the sun’s energy that is reflected by a surface. For example, the Single-Ply roofing system has an initial reflectivity of 87.5% and a three-year weathered reflectivity of 86.5%, based on Energy Star testing procedures. In essence, 12.5% of the sun’s energy is retained in a Single-Ply roof, while the other 87.5% is immediately reflected back into the atmosphere. An average Black EPDM roof has an initial reflectivity of 6%, indicating that 94% of the sun’s energy is retained in the Black EPDM roof.

    Most authorities have concentrated on reflectivity as the prime measurement of energy performance of cool roofing. However, with even the most reflective materials, some energy is absorbed, and if that absorbed energy is not released efficiently, it can cause a roof to heat up. Because of this, emissivity should also be considered. Emissivity is the second key measurement of energy performance when evaluating for a cool roof. Emissivity is a measure of power indicating how effectively/quickly a surface releases the originally retained sun’s energy. Scientists use a number between 0 and 1, or between 0% and 100%, to express emissivity. The lower the number or percent, the slower the material is to release the heat. With the exception of a metallic surface, most roofing materials can have emissivity values above 0.85 (85%).
    The Single-Ply roofing system has an emissivity of 95%. So the originally retained sun’s energy (12.5%) in a Single-Ply roof is released at a 95% rate.

    SRI Another measurement, called the solar reflectance index (SRI), is beginning arise as a cohesive measure. SRI combines reflectivity and emissivity to measure a roof’s overall ability to reject solar heat. The calculation of this index is defined by ASTM E 1980-01 and is based on a mathematical formula that includes values for solar absorbance, solar flux, thermal emissivity, the Stefan Boltzman constant, and various other coefficients.

    To Compare:

    Standard black (reflectivity 5%, emissivity 90%) has an index of 0.
    Standard white (reflectivity 80%, emissivity 90%) has an index of 100.
    Very hot materials can actually have negative values and very cool materials can have values greater than 100. See some samples below to see the correlation of factors:

    Roofing System
    Single-Ply Roof
    White EPDM
    Kynar Coated Metal, White
    New,Bare Galvanized Steel
    Light Gravel on BUR
    White Granular Surface Bitumen
    Dark Gravel on BUR
    Black EPDM
    SRI
    108
    84
    82
    46
    37
    28
    9
    -1
    Reflectivity
    87.5%
    69%
    67%
    61%
    34%
    26%
    12%
    6%
    Emissivity
    95%
    87%
    85%
    4%
    90%
    92%
    90%
    86%

    Materials with the highest SRIs are the coolest roofing choices and offer you the most energy savings.

    A reflective roof can lower roof surface temperature by up to 100°F, decreasing the amount of heat transferred into a building. This will ultimately help reduce the amount of air conditioning needed in buildings, and can reduce peak cooling demand For LEED-EB: The system itself can directly achieve one point and, in combination with other design criteria, can help with obtaining as many as 15 points toward the minimum LEED-EB certification of 32-39 points.

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    Duro-Last Roofing System

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    Testimonials

    • Olympia Tile & Stone office and flagship showroom facility was covered with an aging and deteriorating roofing system, and the leaks had begun to disrupt daily business operations. Olympia needed an immediate fix. According to Guycan’s Roof Consultant “with a built-up system, we would have needed to postpone the project until spring when the snow and ice melts. Olympia Tile could not afford to wait because the current roof wouldn’t withstand another winter season. Leaks were already causing damage to their product inventory. Despite challenging weather conditions, including cold temperatures, high winds and record snowfall; Guycan was able to install the Duro-Last roofing system in 28 working days. Guycan has installed another Duro-Last roofing system at an Olympia showroom location in Ottawa (10,000 square feet) and are working on other locations for Olympia.

      Olympia Tile & Stone

    • Kleen-Flo Tumbler Industries Limited had a roof that was over 30 years old, and needed constant repair to keep from leaking. Guycan’s repair service was able to contain the leaks, and keep the problem from worsening. Sukhdev Mann was so impressed by the prompt service; he decided to hire Guycan for the 85,000 sq.ft. re-roofing project. Guycan was able to install the Duro-Last membrane in 4 weeks with no disruption to Kleen-Flo’s daily operations. Sukhdev was impressed not only by the workmanship Guycan was providing, but also by the unique relationship he was able to build with Guycan owners Randy and Jason Deonarain. When it was time for Kleen-Flo to install solar panels, Guycan was the only solution.

      Kleen-Flo

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