Roofing Services
Bothwell-Accurate is the innovative leader in superior installations for all Roofing, Waterproofing & Sheet Metal applications, and is committed to achieving the highest return on your investment. Our strong team of experienced professionals instill corporate citizenship, a passion for continuous improvement, and market leadership through environmental initiatives and a focus on reducing energy consumption.
Roofing Services Info Sheet (PDF)
Lightweight Concrete
Lightweight Insulating Concrete Roof Insulation Systems have proven to be valuable in meeting sustainable building objectives by reducing mechanical and thermal stresses on the roof membrane resulting in increased service life.
A substrate’s heat capacity directly affects the temperature of the roof membrane it is in contact with. Heat capacity is the amount of heat an object can hold. Rigid foam plastic board stock insulations with high R-values are intended to decrease heat transfer between the interior and exterior of a building. They have less ability to absorb and release heat than traditional substrates such as wood and concrete.
As a result, the roof membrane is exposed to higher heat for longer periods of time. Increasing the membrane temperature 18°F (10°C) doubles the aging rate (The Arrhenius Equation) of the roof membrane. Thus, using a substrate with a high heat capacity helps to pull heat away from the roof membrane.
The "thermal inertia" or mass effect of light weight insulating concrete roof insulation systems also reduces extreme temperature fluctuations and the resulting thermal stresses that cause membrane fatigue failure. The graph below shows the thermal lag provided by lightweight insulting concrete roof insulation versus polyisocyanurate systems. This has the added benefit of reducing fluctuations in HVAC loading requirements.
Building envelope design and construction issues, including related costing models, are simplified by using Lightweight Insulating Concrete Roof Insulation Systems.
Placement of lightweight insulating concrete is an extremely enconomical method of enhancing the roof diaphragm performance of steel deck. The effect is to increase the shear strength and shear stiffness of the metal panels without the use of additional bracing in the interior of the building. Following is an example:
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Rigid Insulation
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Lightweight Insulating Concrete
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The ability of light weight insulating concrete roof insulation systems to optimize the amount of steel used in roof assembly construction minimizes the material resource requirements for steel components such as metal deck and bar joists. In addition to enhancing shear strength and shear stiffness, incorporating a lightweight insulating concrete deck system can have significant financial impact by reducing metal deck cost.
| Example: 50,000 sq. foot project - metal cost (G-60 galv.) | |||
| 2007 | 2008 | 2009 | |
| B-20 | $1.00 / ft2 | $1.31 / ft2 | $0.82 / ft2 |
| B-22 | $0.80 / ft2 | $1.27 / ft2 | $0.69 / ft2 |
| 26 ga/inch | $0.55 / ft2 | $0.89 / ft2 | $0.48 / ft2 |
Numerous regulatory approval listings are availbable for Lightweight Insulating Concrete Roof Insulation Systems. Please check Factory Mutual RoofNav, Underwriter's Laboratories, and Miami Dade NOA listings for specific requirements.
Concrete Envelope Design Info Sheet (PDF)
Concrete Steel Deck Design Info Sheet (PDF)
Repairs, Replacement and Maintenance
We provide a variety of services to building owners and managers, from emergency roofing repairs to ongoing roof maintenance, or the replacement of an existing roof.
Roofing Analysis
As a building owner or manager, you need to ensure that your roof is in top-notch condition, and will continue to provide maximum protection and energy savings, as well as a solid return on investment. With our in-depth roofing analysis service, we will walk the roof and create a comprehensive report defining the state of your roof, recommendations for maintenance and/or re-roofing, and an implementation plan that will fit your budget.
New Roofing
Bothwell-Accurate has the experience and expertise in all types of new roofing applications, ensuring that your roof meets all standards and provides a quality product that achieves a solid return on investment.
Please review our completed projects page to see a list of Bothwell-Accurates projects both past and present.
We would be happy to respond to your request for pricing or quotation request. For more information or to submit an RFP for new roofing, please contact us at 905-673-0615 .
For more information on the roofing systems we install, visit our Roofing Systems section.
Re-Roofing
Bothwell-Accurate can provide a variety of replacement roofing systems, for literally any application. As part of our service, we will do an on-site inspection and provide you with a complimentary quotation, based on your business needs and our recommended roofing solution for your building.
There are many factors involved in determining the best approach to your re-roofing project, from the state of your existing roof, to your budget. We will work with you to analyze your requirements and design a solution that meets all your needs.
We would be happy to quote you on your re-roofing project. For more information on our re-roofing services, please contact our re-roofing department at 905-673-0615 .
Environmental Roofing
Bothwell-Accurate is a leader in environmental roofing for energy savings and greenhouse gas reductions. As one of the only Canadian companies certified ISO14064 compliant, we provide both green and photovoltaic roofing.
Green Roofing
If lightweight insulating Concrete were any greener, it would have leaves.
Sustainablility is a cornerstone of the green initiatives spreading across the country. And no roof insulation is more sustainable than Lightweight Insulatin Concrete. In fact, once a Lighweight Insulating Concrete System is poured in place, it stays there a long, long time.
Unlike disposable rigid polyisocyanurate insulation, Lightweight Insulating Concrete can be reroofed indefinitely, which dramatically reduces both the environmental cost of filling landfills with discarded polyisocyanurate and the life-cycle cost of the roof. And the system is very effective in moderating roof membrane temperatures, thereby extending the membrane's life.
The Lightweight Insulating Concrete System conbines the unique properties of lightweight insulating concrete and premium expanded polystyrene foam insulation board. by encapsulating the insulation board in insulating concrete, the system provides fire protection, prevents air infiltration, bonds the system to the substrate, and creates a monolithic, reroofable surface ideal for installation of the roof membrane.
The role of the roof is expanding. As you work "green," consider Lightweight Insulating Concrete Systems - a permanent insulation solution with a performance history of over 70 years. For more information on Lightweight Insulating Concrete, call 905-673-0615 .
Green Roofing Info Sheet (PDF)
Photovoltaic Roofing
Photovoltaic (solar cell) technology has been around since the late 1950’s when they were used to power earth-orbiting satellites. Today photovoltaic modules are being used to provide power to commercial, industrial and institutional building in the greater Toronto area.
Installed during the new or re-roofing process, photovoltaic roofing systems can reduce utility costs and eliminate dependency on grid provided power, while also adding up to three LEED credits to your building.
Bothwell-Accurate can implement the appropriate photovoltaic roofing system for your project that provides reliable, affordable green power for your commercial, industrial or institutional building.
We would be happy to respond to your Request for Pricing or quotation request on our environmental roofing services. For more information or to submit an RFP, contact Bruce Merstorf at (416)762-8243 or bmerstorf@baroof.com.
For more information on the traditional roofing systems we install, visit our Roofing Systems section.
Service Department
Bothwell-Accurate provides 24x7x365 emergency service, on an as-needed basis, or as part of our preventative maintenance program.
Like many other building components, roofs will be subject to climatic and environmental conditions that contribute to wear and tear – but most roofs fail not from age but from neglect. One of the easiest ways to save money on roofing is to move to a roofing maintenance program. Many of our major corporate and institutional clients have added up to 50% more service life to their roofs and realized significant savings on costly repairs and premature replacement.
Drawing on the knowledge and experience we’ve gained over the last 80 years, Bothwell-Accurate has a strong and effective set of programs for roofing maintenance and management. Our Roof Management Program is constructed around a 20-point preventative maintenance and repair schedule, and provides building owners to identify and eliminate existing and potential roofing problems, reducing overall maintenance costs as well as those unexpected costs that play havoc with budget management.
The Bothwell-Accurate Roof Management Program:
Analyze |
Annual or semi-annual 20-point preventative maintenance inspection identifies and documents all visually apparent deficiencies on your roof, and verifies the following:
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Report |
We provide you with a detailed status report on the general condition of your roof, as well as an assessment on its life expectancy. Our report also includes an itemized list of issues complete with recommendations and quotations for remedial work. |
Plan |
We work with you to create a roof management and maintenance plan that works with your budget while properly protecting your roofing investment. |
Implement/Strong |
We implement maintenance activities according to the plan – and will schedule these with you to ensure proper access with little or no disruption of building operations. |
Leak response includes pictures and a description of repairs performed. All work performed on a Time & Material basis, ensuring fast, reliable response and the most cost effective value.
- Emergency leak response 24hr on call service.
- Repairs to aging roofs where deficiencies are affecting the overall performance of the roof.
- Complete upgrades &/or modifications (i.e.: Curbs, vents etc).
- Annual inspections where we provide a quote on visible deficiencies.
We would be happy to respond to your Request for Pricing or quotation request. For more information on the roofing systems we install, visit our Roofing Systems section.
Service Department Info Sheet (PDF)
Roofing Systems
Whether for new or re-roofing applications, Bothwell-Accurate provides top-of-line products and services to ensure the highest quality roofing installation.
Environmental Roofing
As one of the only ISO14064 certified roofing companies in Canada, Bothwell-Accurate has the experience and expertise to implement your environmental roofing system. For more information, visit our Environmental Roofing page.
Built Up Roofing System 4-ply
Built-Up Roofing (BUR) is one of the oldest and most common types of commercial roofing membrane that is still applied to roofs today with a track record of over 120 years. BUR is a series of field laminated layers of asphalt and Organic or Fibreglass felt, with a flood coat of asphalt and Pea Gravel used for UV protection. The most important things to consider when selecting a built-up roof are the quality of materials, professionalism and the experience of the installers – Bothwell-Accurate gives you all of these, ensuring the best capital return on investment for your roofing project
Advantages
- Time proven
- Good adhesive characteristics
- Fairly good chemical resistance
Disadvantages
- Brittle at low temperatures
- Messy and dangerous
- 90% field assembled
- Labor intensive
- Smell
- Escalating Crude Oil Prices
Common Facilities with Built Up Roofing
- Schools
- Warehouses
- Malls
Built Up Roofing System 4-ply Info Sheet (PDF)
Modified Bitumen
This roofing system employs reinforced glass or polyester fabrics impregnated with rubberized asphalt, resulting in a lighter product than built-up roofing. With no ballast requirement, Modified Bitumen system offers greater design freedom with color choices, and decorative and textural finishes. Modified Bitumen Roof Systems are done in two layers; Base Sheet and a Cap Sheet with ceramic granules on top for UV protection with roll sizes limited to 3’ wide rolls.
Installation Methods
- Cold Process (Glue)
- Fully Adhered in Asphalt
- Fused in place by Torching
- Peel and Stick
Advantages
- Small rolls
- Various installation methods
- Asphalt based and Compatible with BUR roofing systems
- Variety of different colors
Disadvantages
- Small rolls
- Torching installation can result in fires
- Labor intensive
Common facilities with Mod Bit
- Schools
- Apartment buildings/ High-rises
- Hospitals/ Institutional buildings
- Strip plazas
Modified Bitumen 2Ply Info Sheet (PDF)
Hot Rubberized Asphalt
This liquefied material is used in inverted roofs where insulation and ballast rest on top of the “pour-and-cooled” two ply membrane. It bonds to the substrate forming a monolithic skin over the roof, creating a vapor and air barrier. Its elastomeric base gives the Hot Rubberized Asphalt roofing system a “self-healing” property.
Cold Applied Systems
Multiple plies of organic or inorganic felts can be laid in the roofing system using cold adhesives. This can be advantageous when the use of hot materials is not practical.
Single Ply Systems
Single ply membrane systems are lightweight, clean, and rapidly installed. A number of systems are available in elastomeric and polymeric base compounds. Working only with proven products from the top manufacturers, we install single-ply systems including:
PVC thermo-plastics
Rubber / elastomers (EPDM)
TPO Single Ply
Hybrids such as heat-weldable rubber membrane products
PVC Systems
Polyvinyl Chloride (PVC) is a recyclable single ply membrane and most commonly found in white but is also available in custom colours. Roll widths of PVC are available in 5’ or 10’ and up to 100’ long. PVC membrane seams are hot air welded together, which provides a strong and trusted seal and minimizes the use of environmentally damaging adhesives and sealants. PVC is another solution for white rooftop demands and provides excellent resistance to rooftop chemicals and oils.
The installation methods include
- Fully Adhered (Glue)
- Mechanically fastened
- Loosely laid and ballasted
Advantages
- Excellent fire resistance (self extinguishing)
- Available in a variety of colors (minimum orders)
- Great reflective qualities
- Excellent flexibility
- 90% Pre-assembled
- Recyclable
- Light weight assembly
- Used (North America) since 1970
Disadvantages
- More inclined to punctures from construction traffic
- Slippery when wet or icy
- Solvent sensitive
- Plasticizer migration
- Not compatible with asphalt
EPDM Systems
Ethylene Propylene Diene Monomer (EPDM) is a cost effective solution for new or reroof projects due to its high performance characteristics and ease of installation. EPDM is a single ply rubber sheet, most common in black but is available in white. Standard thicknesses of EPDM are 45, 60 and 90 mil and come in widths of 50’. EPDM sheets are joined together using seam tape and bonding adhesive which makes EPDM installation quick and easy. Even at -60 degrees Celsius, EPDM still performs without cracking and blistering, which makes EPDM a great option for cold Canadian winters.
Installation methods include:
- Fully Adhered. (Glue)
- Fully Adhered in Asphalt. (Fleeceback EPDM Only)
- Mechanically fastened. (Using reinforced EPDM sheet)
- Loosely laid and ballasted.
Advantages:
- Excellent water resistance
- Excellent weather resistance
- Excellent heat resistance
- Good Acid and Alkali resistance
- Excellent flexibility
- 90% Pre-assembled
Disadvantages:
- Available commonly in black (white EPDM is available but seldom used)
- Requires careful seaming
- Ballasted/Inverted Roof assemblies are heavier in weight
Common Facilities with (EPDM):
- Large plants/warehouses
- Office buildings
- Hospitals
- Waste water treatment plants
The Attachment methods of an EPDM roof are:
- Fully Adhered. (Glue)
- Fully Adhered in Asphalt. (Fleeceback EPDM)
- Mechanically fastened. (Using reinforced EPDM sheet)
- Loosely laid and ballasted.
For more information, or to submit an RFP for new or re-roofing, contact Bruce Merstorf at 905-673-0615 or bmerstorf@baroof.com.
Ethylene Propylene Diene Monomer (EPDM) Info Sheet (PDF)
TPO Systems
Thermoplastic Polyolefin (TPO) is one of the fastest growing divisions of the commercial roofing industry. TPO is a single ply roofing membrane which is most commonly found in a light grey but is available in custom colours. Roll widths are available in 6’, 8’, 10’, and 12’ and up to 100’ long which makes covering a large rooftop quick and easy. The TPO roof combines the security of hot air welded seams with the long term weather sustainability of rubber. With an increasing demand to move to white rooftops, TPO provides a solution for those particular requirements.
The methods of installation include:
- Fully Adhered (Glue)
- Fully Adhered in Asphalt (Fleeceback TPO)
- Mechanically fastened
- Loosely laid and ballasted
Advantages:
- Excellent water resistance
- Excellent weather resistance
- Excellent heat resistance
- Excellent flexibility
- Available in a variety of colors (minimum orders)
- Great reflective qualities
- Light weight assembly
- 90% Pre-assembled
- Recyclable
Disadvantages:
- More inclined to punctures fromconstruction traffic
- Slippery when wet or icy
- Requires careful seaming
- Relatively new, has only been available 17 years
Common facilities with (Tpo):
- Large plants/ warehouses
- Sports arenas
- Airports
- Office buildings
Waterproofing
Waterproofing is seldom visible, yet vital to the performance of a building. It takes considerable knowledge and experience to implement the correct waterproofing system based on your building and business needs.
With various types of waterproofing systems available and over 20 years of unique waterproofing experience, Bothwell-Accurate can recommend and implement the waterproofing system ideally suited to your building and needs.
Often, building owners will encounter wet conditions below-ground because they believe the solution will be costly – but in some cases, it may require a simple repair or re- sealing that can be done from inside the building. We would be pleased to inspect your building and provide our recommendations for your waterproofing needs.
From new construction to repair projects, Bothwell-Accurate has dedicated waterproofing crews and are ready to deliver outstanding results on your next project.
Our Waterproofing Services Include:
- Basement wall waterproofing.
- Cold applied elastomeric waterproofing
- Horizontal decks over parking garages, balconies and other living spaces
- Mechanical room floor coatings
- Vehicular traffic topping
- Specialty products such as cementitious coatings (ex: in elevator pits) and clear sealers to slab on grade (ex: in parking garages)
- Blind side waterproofing
We can also prepare budgets for your specific project needs and find solutions when faced with difficult variables!
For more information on our waterproofing services, please contact Mario Giraldi at 905-673-0615 or mgiraldi@baroof.com.
Waterproofing Info Sheet (PDF)
Sheet Metal
Bothwell-Accurate Co. (2006) Limited is pleased to announce that we have now added Metal Siding, Metal Roofing and Metal Panels to our existing Sheet Metal Division. Don Alford has recently joined our team after 30 years with “Cem-Al Corporation” and will now be in charge of upgrading the sheet metal department to provide a wider range of sheet metal services.
Our existing supplier force has been improved to include all of the materials manufactured at Vic West, Agway, Roll Form Group, Kingspan, Reynobond, Alcoa, and Alpolic.
We now have the manpower that were directly involved to supply and install projects such as 25 York St., Telus Office Tower, Kolter Offices, BMO Barrie Computer Centre, Toronto Airport, Durham College Additions, General Motors Camero Plant and Ford Canada Oakville Updates to mention a few.
Whether you have a $10,000.00 front entrance with columns, fascia and soffit only, or a $900,000.00 multi floor cladding project, we can handle both with the same professionalism that Bothwell-Accurate has always provided.
We are happy to provide a quotation for your metal flashing and cap needs. For more information custom sheet metal services, please contact Bruce Merstorf at 905-673-0615 or bmerstorf@baroof.com.
