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PAZRoofing and Waterproofing is a Canadian run and owned company with the Corporate Office located in Toronto, Ontario. PAZRoofing and Waterproofing offers a complete line or roofing services. After being in the roofing and waterproofing for more than 22 years, PAZRoofing and Waterproofing has become one of the leading specialty roofing contractors<.
PAZRoofing and Waterproofing offerings include new and replace all types of flat or sloped roofing systems, as well as Facility Roof Maintenance Programs and Solar Power Energy Systems. Through combining the process of traditional slate layering installation with state of the art technology in material development, we have managed to engineer a World Class product. We strongly believe that all consumers should receive the best value for their money in any marketplace. As well, we believe that trust in business is maintained through value and that real value can only be shown by the quality of the particular good or service that is being offered.
PAZRoofing and Waterproofing is committed to delivering innovative solutions to the building and construction industries. We provide installation, monitoring and maintenance services to rooftop Solar Photovoltaic systems throughout Canada. Governed by this principle, we shall continue to deliver real, genuine value to our consumers through nothing but the best, top quality products. PAZRoofing and Waterproofing is licensed and insured, and has a solid reputation and consistent financial performance. We have significant bonding capabilities to meet the needs of our clients. Commercial, industrial and residential services, flat roofs installation and repairs, solar panels installation and repairs, shingles repairs, leaks repair, waterproofing and more.
Built-Up Asphalt and Gravel Flat Roof Systems
Built-up roofing has been used for more than 100 years and is extremely durable. That's becoming more apparent over time. BUR offers the added protection of redundant multiple layers, performs well in extremes of heat, cold, wind, and snow, is easy to repair, and has a proven track record. One perception with BURs is the smell that is often associated with this type of material. Recent innovations have made it possible for some products to reduce up to 90 percent of asphalt fumes at the kettle. This enables the contractor to schedule odor-sensitive jobs during typical business hours. BURs simply last longer. By using an ultra long lasting product, you could be adding five to 10 years of life to your roof. That's hugely beneficial when you calculate your roof life-cycle cost. Quality asphalt today is much the same as the high-quality asphalt that was used by past generations of roofers. Asphalt has always been a good product, which is how it earned its reputation. In common with many industries, quality control is better today, and users are assured of receiving a high-quality product whose properties are more tightly monitored and controlled. Also, there are more choices with regard to asphalt that has been modified with polymer additives. These additives can be used to impart UV protection to the asphalt - for example, when the asphalt is used for a flood coat - or to adjust the melt point and viscosity, depending on the ambient temperature or roof slope, or to adjust the elasticity of the asphalt.
The introduction of modified-bitumen membranes has helped to boost the image of asphalt roofing as a high-tech roofing system. There are also cold-applied BUR systems, which use polymer-modified bitumen in the place of hot asphalt. Other innovations are the use of reflective granules and white cap sheets, and polymer products with a fleece back that can be fully adhered in asphalt. The strength and redundancy of the original BUR is due to the fact that asphalt is an ideal roofing adhesive, which forms a strong waterproof bond between two surfaces. Nothing else compares. So even as new membranes are being developed, they are still installed in asphalt for best performance.
Environmental issues will be a big factor in how BUR systems will be perceived in the future. The educated and qualified roofing community still believes that BUR systems are the best applications and also the best in relation to total acquisition cost. Unfortunately, the people who will set the regulations that govern our industry don't know or care about the fact that BUR systems are the proven "Grand Daddy" in commercial roofing systems.
Alternate applications; combining BUR with other technologies (i.e., cold applied, combining BUR with atactic polypropylene [APP], styrene butadiene styrene [SBS] or even thermoplastic polyolefin [TPO]); and energy-efficient BUR systems and systems that allow less asphalt to be used.
Many products are made from petroleum as a raw material, so increasing oil prices have about the same impact on asphalt roofing as any other industry. In some cases roofers may try to cut costs by choosing options that use less asphalt; for example, by opting for a cap sheet instead of a flood coat. However, recent cost pressures on asphalt have had little effect on overall installed cost of these systems to building owners. Generally, the cost of asphalt remains a small percentage of total installed cost when labor costs are included in the calculations. So, from the building owners perspective, an asphalt BUR is still a high-value roofing system.
The one thing that many building owners still need to understand is that, although initial costs of a BUR may appear to be higher than other roof systems, the long term costs are less for a BUR, which can last for decades. The beauty of an asphalt BUR is that the redundancy of layers provides some insurance against installation defects. A high-quality asphalt BUR with no serious installation defects is extremely durable and can survive for decades. Peak roof temperatures, roof traffic, and type of gravel or cap-sheets can also be factors. It is difficult to put a price on the loss of business that is due to the interruptions of commerce. Significant business losses can occur when a roofing system needs to be replaced after 10 years rather than 20 or more years. Such "invisible" or "intangible" losses are seldom included in life-cycle analyses, but they matter a lot to building owners.
One of the greatest benefits of multi-ply asphaltic systems is the long history of successful leak-free installations. While the initial installation costs may appear to be less with some single-ply systems, the hassle-free performance of multi-ply asphaltic systems pays off in the long term. Quality installation starts with selecting contractors trained and certified by the chosen manufacturer. Guaranteed jobs, inspected prior to the issuance of the manufacturers' guarantee, are also the best way to begin.
In some instances BUR roofs will need to be coated with white roof coatings or will need a reflective white cap sheet to meet the requirements for cool roofs. The addition of these materials adds to the cost of a BUR roof system and could have a negative impact on BUR demand. However, cool roof requirements allow a tradeoff of additional insulation instead of applying a white roof. The insulation tradeoff allows you to continue to use a black BUR roof and still meet the requirements. Tradeoff options, such as additional insulation, can provide a cost-effective alternative for customers and allow them to collow them to continue to use and enjoy the reliability, durability, and proven field performance provided by BUR systems. The cool roof movement has already impacted the BUR market. Manufacturers have responded with energy-efficient cap sheets and coatings to assure compliance with today's stringent requirements.
Today's BUR systems can be installed with minimal impact on the building occupants by following a few standard practices. Odors created during the installation of a BUR system can be mitigated by using low-fuming asphalt or by using equipment that reduces or eliminates asphalt fume emission from the kettle. Other methods for controlling asphalt odors include keeping the asphalt kettle away from building air intake handling units and by properly following the kettle equipment manufacturer recommendations.
Materials and system description
BUR systems generally are composed of alternating layers of bitumen and reinforcing fabrics that create a finished membrane.
The number of plies in a cross section is the number of plies on a roof: The term "four plies" denotes a four ply roof membrane construction. Sometimes, a base sheet, used as the bottom, is mechanically fastened. Built up roofs generally are considered to be fully adhered if applied directly to roof decks or insulation. The reinforcing fabrics also are called roofing felts or ply sheets. Roofing felts are reinforced with either glass-fiber mats or organic mats. Felts are produced in a standard width of 36 inches and metric width of about one meter. The bitumen typically used in BUR roof systems is asphalt, coal tar or cold-applied adhesive. The asphalt or coal tar is heated in a kettle or tanker and then applied by mop or mechanical spreader. Asphalt is a petroleum product refined from crude oil; coal tar is derived from the distillation of coal. Cold-applied adhesives typically are solvent-based asphalts that don't have to be heated in a kettle or tanker. Surfacing for built up roof systems usually include aggregate (such as gravel, slag or mineral granules), glass-fiber or mineral surfaced cap sheets, hot asphalt mopped over the entire surface, aluminum coatings or elastomeric coatings.
Roof System Warranties
When purchasing a new roof system, there will be two warranties to consider. First, there will be the manufacturer's warranty. In general, these warranties cover defects in the manufacture of the roof membrane. Once the project is complete, be sure the contractor provides you with a certificate for your records. Second, the roofing contractor will provide you with a warranty covering his workmanship. Typically, this will cover installation and related issues. The warranty should contain what items are covered and what will void them. Many contractors offer one year or two years of coverage; however, there is no industry standard.
SBS Modified Two Ply Roofing Solutions
Modified Bitumen Roofing Membranes are composite sheets consisting of bitumen, modifiers and reinforcements. The term "modified bitumen" encompasses a broad range of materials, with each specific material differing from the others with respect to the modifiers and reinforcements used. Modified bitumen membranes exhibit the thermoplastic quality of being softened by heat. They are typically bonded to substrates by torch application or asphalt.
Modified bitumens (primarily asphalt) have found many uses in practical roofing applications. SBS (sequenced butadiene-styrene) and APP (atactic polypropylene) polymer modifiers are relating to roll roofing. However, there is significant history with respect to polymer blending as a performance enhancement in cold roofing mastics in the late 1960 and early 1970. A few manufacturers were blending SBS polymers with traditional roofing mastics to impart elastomeric characteristics for use at those roofing joints that demanded higher performance to maintain watertight integrity. Especially, pitch pocket penetrations, edge fascia metal joints were a constant challenge. The coefficient of expansion and contraction of these details exceeded the limits of the typical fiber reinforced mastic, that exhibit cracks and splits that accelerated after a nominal amount of field exposure. As roofing chemistry became more sophisticated, various formulations and viscosity ranges were developed for specific uses, such as elastomeric sealants/mastics for high movement joints and terminations. This improvements for bituminous material's durability and extensibility (especially at lower temperatures) was done by adding polymers (rubber and plastics). Reinforcements have evolved from the true rag felts to pulp, glass, and more recently, to heat-stabilized polyester blends and combinations of glass and polyester.
Modified products were developed for different reasons. It was very hazardous to work with hot bitumens in confined areas, and to achieve the desired bond to vertical surfaces. Polyurethane based on application are provided in horizontal and vertical viscosities. Most products have a low VOC that are compliant with air quality regulations and worker safety concerns. These materials are usually applied with a notched trowel to achieve the appropriate thickness for waterproofing integrity, and when cured, offer excellent MVT resistance and crack spanning capabilities.
To meet the needs of extensive lightweight slab construction, hot-applied modified asphalts appeared in the construction market in the mid 1970s. Unlike roofing asphalts, these materials were blends of non-blown asphalts and elastomeric polymers, primarily SBS. The advantage over conventional waterproofing configurations for on-grade waterproofing of plaza decks is that multiple layers of reinforcing felts are not needed. Unlike roof deck constructions, the concrete pours are stable. Typically, the hot-applied modified waterproofing systems are reinforced with a single layer of compatible, heat-stabilized, polyester fabric. Some Department of Transportation divisions accept hot modified bitumen materials for bridge deck repair as well as other concrete joint remediation.
The current generation of asphalt hot-melts is derived from the success of the modified product developments in the waterproofing industry. However, unlike the strict heating parameters required (oil-jacketed kettles) for hot-melt waterproofing bitumens, current hot-melt roofing adhesives are not as sensitive to heating as their predecessors. The modified bitumen adhesive can be installed with traditional means and methods, such as a roofing mop or felt-laying machine. The key to temperature flexibility is the result of the use of SBS polymers.
The unique benefit of using compatible hot-melt modified bitumens with MB felts is that all components of the system are elastomeric. Although the commonly accepted recommendation for MB ply installation is to use Type III or IV asphalt, system elongation, cold bend flex temperature, and strain energy are superior with the use of hot-melt adhesives and SBS modified plies and surfacing sheets.
Cold process roofing had its beginnings in the mid 1970s with asphalt cutbacks employed as the adhesive between coated base sheets. The application was developed for those projects where kettle locations were restricted or the fumes were highly objectionable. The materials are applied at ambient temperature or slightly heated to facilitate application through spraying. Rarely does the application temperature reach 100 F. A cold asphalt cutback is modified with calcium carbonate, a were highly objec-variety of reinforcing fibers and other thixotropes. When a typical roof cut is examined, the core appears to be homogenous. It is difficult to discern the ply lines.
Evolution to Modified Plies
Interestingly, not all coated base sheets were equal when it came to cold process applications. Some roll manufacturers used "softer" asphalt in their coating process. This required extended cure intervals on the roof when used with cold-process adhesives. These systems were often very fragile to any type of foot or mechanical traffic. Often the roof bled profusely or was not able to sustain even minimal traffic for some weeks. If an acrylic or aluminum coating is specified, most manufacturers recommended a cure of at least 30 days. This would require some additional preparation in the form of washing or priming due to the accumulated surface contaminants. The more common finishing method was to broadcast ceramic granules or specific roofing aggregates into a "flood" coat of adhesive. Currently, there are engineered, coated sheets available that combine glass fibers and polyester fabrics that allow for a continuous, rapid installation. Often the coating asphalt on these ply sheets is unblown asphalt or is slightly modified to address compatibility issues with the adhesives. Cold process adhesives can be delivered in tanker trucks, refillable containers, or barrels. The material is then pumped to the roof with pneumatic or hydraulic spray delivery systems. For space-restricted projects, materials can be provided in 5-gallon pails. The materials can then be brush or squeegee-applied. On production projects, contractors often use propane-powered heat-exchange units to ratings by approved, field-applied coatings. There are torch grades of SBS membranes, but they are usually thicker than the hot-applied membranes. The additional thickness is to protect the reinforcing fabric from heat damage during installation. Polyester carriers (or reinforcements) are easily damaged by torch applications and most "Torch Grade" SBS have glass reinforcements. Most torched membranes use the APP modified, which melts at a higher temperature than the rubber modified materials. As restrictions increase with respect to open flames, kettle odors, and congested roof areas, the popularity of cold-applied systems is growing. Many manufacturers offer specially-formulated, modified bitumen roll adhesives. Unlike the solvent-actuated mechanism of traditional cold-process adhesives, SBS cold-applied systems rely on the high-performance, low, or no-solvent adhesive to bond the modified bitumen plies to the substrate and themselves.
Modified Bitumem Roofing Systems
A Torch Down Modified Bitumen roof, or as it is commonly known a 2-ply SBS roof system, is rapidly becoming the most popular roofing system in the market today. Consisting of polyester or fiberglass reinforcing mat sandwiched between two layers of rubberized asphalt, two ply roof system are durable and quick to install. Typical Modified Bitumen Roof System is composed of five basic components that can be assembled in a number of conbinations:
- Surfacing: provide UV protection and weathering surface that can be either factory or field applied,
- Adhesive: actual waterproofing material and bonding agent thet is either hot or cold
- SBS or APP Modified Bitumen Membrane: a factory fabricated sheet consisting of a co-polimer bitumen typically reinforced with polyester or fiberglass,
- Rigid Board: either a modified or non modified base or ply sheet under a modified
- bitumen top,
- Insulation: provides R-Value and stable substrate for roof system,
- Flashing: provides waterproofing around roof perimeter, equipment and projection.
Installers who attempt to install torched down roofing without proper training generally show their lack of experience in the work that they do, but improperly installed torch down roof will likely fail within the first two years of use. Applicator quality is one of the only sure ways to eliminate costly replacement. The quality of different two ply SBS systems varies and unlike some items, cost is not always the best measure of performance.
EPDM Singly Ply Roofing System
EPDM single-ply roof systems have represented a third of the volume of the low-sloped commercial market for close to twenty years. The majority of this roof system is receiving the full manufacturer's warranty. EPDM has achieved a reputation in the industry as a long-lasting material, and advancements in materials, techniques, and components have given manufacturers the confidence to offer the industry's longest warranties of thirty years. EPDM is more than just a Black Membrane. In the midst of tough economic times and the increasing popularity of sustainable commercial roofing materials, suppliers of ethylene propylene diene monomer (EPDM) continue to see the many benefits of this system, including its outstanding weathering characteristics, flexibility, durability, hail resistance and life cycle costs. However, when seeking a "cool" roofing option, many building professionals do not realize that EPDM provides similar energy savings as its white, non-EPDM, counterparts. According to the EPDM Roofing Association, EPDM market share in Europe is around 12 percent and growing, compared to 35 percent in the North America where 20 billion-plus square feet has been installed on low-slope roofs. There has also been continued growth of EPDM in the Middle East and China.
Behind more than four decades of successful field performance, EPDM has become the system of choice for many suppliers, contractors, specifies and building owners worldwide. With superior wind, hail and fire resistance, EPDM also handles the some times harmful effects of Mother Nature. Weather ability is main benefit to EPDM's success, and a recent study showed that new and aged nonreinforced EPDM roof assemblies offered a high degree of hail resistance over a variety of roofing substrates, including polyiso, wood fiber, plywood and OSB board.
EPDM is also available for use in a variety of climates because of its dimensional stability and ability to expand and contract with movement. Its unique formulation ensures that EPDM is virtually resistant to harmful ozone exposure and UV radiation, along with cold cracking. EPDM does not rely on plasticizers to achieve flexibility, so there is no danger of the membrane becoming brittle from plasticizer loss in the future. As with any roofing system, insulation is important to ensure the building is energy efficient. Adding additional insulation to an EPDM project can not only increase the R-value, but eliminate thermal short circuits and potential moisture issues.
EPDM offers commercial roofing professionals a variety of energy efficient options. White EPDM membrane systems have been created to enhance UV resistance. These systems provide the same performance characteristics as black EPDM membranes but with added environmental and energy benefits. White coatings that can be applied to the black EPDM membrane surface have also become increasingly popular to extend the roof life, increase energy savings and decrease pollution. Ballasted EPDM roofing systems also play a similar role to reflective roof surfaces. Although pavers and stone ballast do not have as high reflectivity rates as white coatings, ongoing tests indicate that there is a positive impact on energy usage with this EPDM system type. The ballast absorbs the heat during the day while shading the roof membrane and then releases the heat during the evening hours.
EPDM Roofing Systems may be selected for many commercial and industrial roofing applications. The choice of system is left up to the specifier, however, there are certain guidelines that should be followed in order to assure that the system chosen is appropriate. EPDM membranes can be installed fully adhered, mechanically attached or ballasted.
Ballasted EPDM Roof System
The ballast system is often used over expanded polystyrene insulation, which is lightweight, economical and energy efficient. Because the EPDM adhesives dissolve the polystyrene, the membrane is only laid over the insulation, mechanically attached around the perimeters and held down with ballast. The ballasted system is the most economic EPDM roofing system on the market and it is suitable for various types of buildings. The EPDM system is loose laid over appropriate roof deck. Adjoining sheets of EPDM membrane are spliced together a minimum of 6" using splice tape, forming continuous watertight membrane. This multifunctional system usually utilizes 0.045" thick EPDM membrane. Once the EPDM membrane is laid, the following materials may be used as ballast:
- Rounded water-worn gravel without sharp edges and with suitable size (20 to 40 mm),
- Concrete slabs (minimum thickness 50 mm) with smooth decorative finish. The installation of protective material between the slabs and the EPDM membrane may be required,
- Crushed stone, which must be calibrated; the bigger the stone, the greater the weight. Protective material must be used between the crushed stone and the EPDM membrane.
The Benefits of Ballasted EPDM are: use of large-scale EPDM panels, fewer splices, a wide rage of modern roof decks, quick installation, low installation cost and excellent fireproof properties.
Mechanical Attached EPDM Roof System
If the structure cannot support the additional weight of ballast, or if EPDM is being installed over existing roofing material, such as tar and gravel, a mechanical attached system is a better choice. Reinforced EPDM is recommended for mechanically attached applications because it is resistant to punctures/tears and wind fatigue at anchors. Mechanically fastened System is a system, which may not sustain the additional weight of the ballast and have surface, suitable for mechanical fastening. The system utilizes wide membraine panels, loose laid onto the substrate. The panels in the outer areas may be either fully adhered or mechanically fastened. The membrane panels in the internal areas are fastened mechanically by nailed plates, placed over the panel and protected by pressure-sensitive 150 mm strips, covering the nailed plates. The installation rate of the plates (up to 6') varies in accordance with the wind rating. Adjoining membrane sheets are spliced together using secure tape and overlap by at least 6" in order to form continuous airtight membrane. The system may be used with 1.52 mm thick EPDM membrane.
The Benefits of Mechanically Fastened EPDM are: use of large-scale EPDM panels, fewer splices, fast installation rate, quick installation, light weight.
Fully Adhered EPDM Roof System
The fully adhered system is the most common, especially on residential buildings. Typically it has fewer problems than the other two applications. EPDM Fully-Adhered is a light-weight system with special flexibility design. It is suitable for irregular configuration or shape roofs, as well as for steeply pitched (more than 10%) roofs. This system is also suitable for roofs, which cannot sustain the additional weight of the ballast. The system usually utilizes 9' wide waterproofing panels, adhered directly ad fully to acceptable substrates by means of a bonding adhesive. The adjacent sheets must overlap by at least 6" and the splices are carried out by means of pressure-sensitive strip, forming continuous airtight membrane. The system may utilize 1.15 or 1.52 mm thick EPDM membrane. The Benefits of Fully Adhered EPDM are: may be used for all kinds of slopes, suitable for irregular roof configurations, high wind uplift resistance, light weight, esthetic outlook.
Fully Adhered EPDM Roof System Warranties
Based on the warranty records of the three billion square feet of EPDM roofs, EPDM roofing performance has improved dramatically over the past 20 years. In fact, the improvement in performance now makes the cost of servicing an EPDM roof for ten years almost negligible. Given the extremely low cost of warranty service through the first ten years of service, it is also likely that the great majority of these roofs will continue to offer superior service for many years beyond the ten years of this study. It also appears this improvement has been most significant for EPDM recover systems. Given the escalating costs associated with roof tear-off and the ever-present financial constraints on building owners, a roofing designer certainly can take comfort knowing that a properly selected EPDM recover system may provide an acceptable service life at a reasonable cost. Of course, the data presented in this article should not be used to endorse recovers in all situations. Existing roofs that are saturated with water or seriously deteriorated are obviously candidates for a complete tear-off. However, when an EPDM recover system is properly installed over a suitable existing roof, it will provide many years of acceptable service with minimal warranty service expense.
TPO/PVC Single Ply Roofing Membranes
Thermoplastic roof membranes were first introduced and installed in Europe in the early 1960. Almost a decade later, this membrane was used in the United States. At that time, most of the original membranes were based on vinyl (polyvinyl chloride - PVC) and first time were produced and supplied to the North American market by European companies. Vinyl roofing was implemented during oil crisis that, had a major impact on the cost and quality of built-up roofing. Vinyl roof membrane was user-friendly and could be installed by a variety of application methods and under many different weather conditions. Today, vinyl roof membranes have the longest tracking record of any other types of thermoplastic roofing membrane. The use of PVC roofs continues to grow up. In 1999, PVC accounted for 7% of the average contractor's roofing volume. Reinforced PVC roof membranes have many important attributes that complement their proven track record. Besides the important feature of heat-welded seam technology, PVC or vinyl roof membranes offer many other inherent features:
- System flexibility to match project and construction needs.
- An ability to be made in a spectrum of colors, including white reflective roofing that has proven to save energy, mitigate urban heat island effects, and improve air quality.
- High resistance to puncture and impact.
- Excellent resistance to flame exposure and subsequent fire propagation.
- Proven durability against rooftop soiling and contamination.
- Good low-temperature flexibility and high-temperature tolerance.
- Excellent roof installation productivity.
As mentioned above, quality reinforced vinyl membranes have a long history of installations worldwide. Many that were installed over 20 years ago in North America and approaching 40 years ago in Europe are still performing today. Unfortunately, some vinyl roof membranes were not good performers. In the 1980, there was a problem with vinyl roofs installed in the late 1970, consists to thin membrane and unreinforced, poorly-formulated membranes installed in stone-ballasted applications. Many of these products were used successfully in mild European climates, but could not withstand the temperature swings that occur in much of North of US and Canada. The sometimes sudden and catastrophic failures of PVC roofs were documented. Throughout all this negativity, there were a few manufacturers who continued to produce high quality vinyl roof and waterproofing products. The fact is that well-formulated, reinforced, dimensionally-stable vinyl roofing has one of the best track records in the roofing industry. It is apparent that after close to 40 years in the marketplace, PVC continues to hold the lion's share of the European single ply market. FPO (Flexible Polyolefin) membranes were first introduced for roofing in 1991. They were quickly introduced in the United States (as TPO - thermoplastic polyolefin) in the early 1990. The TPO membranes, produced by North American suppliers are very different from the FPO in Europe:
- The average flexible polyolefin membrane in Europe is 0.064 inches thick. The most common TPO thickness in Canada is
- 45 mils. However, many of the products labeled "45 mils" actually have as little as 32 mils of actual polymer3.
- European manufacturer uses fiberglass reinforcement in addition to polyester reinforcement to improve dimensional stability.
A reinforced TPO membrane will move (expand and contract) five to seven times more than a reinforced PVC membrane4.
In the North America, TPO membrane usage continues to increase. At this time TPO is taking away from EPDM and dark colored membrane market share. A high-quality TPO membrane with a proven, consistent formulation, when properly installed, can result in a very good roof. However, evidence is mounting that a compromise on material quality and inadequate seaming training are resulting in problem TPO projects. A number of owners and contractors are concerned about what the performance of produced TPO has been to date. If TPO manufacturers are not careful, they will create a negative perception of TPO membranes and potentially all thermoplastic roofs. PVC and TPO may look pretty same but are very different products and will perform very differently. Just because they look similar and are heat-weldable, a generic specification containing both PVC and TPO will not mean similar results. If price is the deciding factor, the customer will get the cheapest product, not the best long-term value. According to the Single Ply Roofing Institute PVC and TPO roof membranes have been the fastest growing product category of the commercial/industrial flat single ply roofing market.
TPO roofing membrane can be install mechanically attached, fully adhered or ballasted.
Mechanically attached systems offer exceptional performance in high wind conditions at a very low installed cost. The complete line of fastening accessories assures the right attachment for the right condition.
Fully adhered systems are ideal for roofs with unusual or odd-shaped contours, where mechanical penetration of the membrane is not desirable, yet exceptional wind performance is needed. The back of the membrane and the substrate are coated with bonding adhesive, allowed to dry, carefully rolled back into position and broomed into place.
Ballasted installation is perfect when a job needs to be done fast and inexpensively. Insulation and membrane are loose-laid with the membrane fastened only at the perimeter. Recommended ballast is smooth, water-worn rocks. Substrate must be capable of supporting the dead load of the system.