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On The Roof - Bothwell Accurate Newsletter

Winner of an Apple iPad selected in the CanSia iPad Draw

December 14, 2010

Dear CanSia i-Pad Draw Participants,

On behalf of Bothwell-Accurate I would like to extend my sincere thanks to everyone who visited our booth and participated in the iPad draw during the CanSia 2010 Conference.  I am writing today to inform all participants that Mr. Terry Smith, a representative of PCL Canada has won the draw.

Here at Bothwell-Accurate we are actively interacting with solar providers, builders, engineers, roofing membrane manufacturers and other construction professionals to better understand solar arrays and how they can be integrated to the roof surface. By doing so we know we will be able to offer our customers the absolute best solutions for rooftop PV Solar installations now and in the many years to come.

As the Ontario solar market continues to expand due to the OPA’s Feed-In Tariff plan there are sure to be many exciting and challenging builds ahead. We hope that you will keep in touch with us for any PV solar rooftop applications you or your customers may need assistance with in the future and wish you all the best in Ontario’s burgeoning solar landscape!

Kind Regards and Merry Christmas,
Krystal Vassallo
Rooftop PV Solar Liaison, Bothwell-Accurate

See the official letter sent out to all Participants (PDF)


Rooftop Photovoltaic’s
Time and consideration must go into choosing the right PV solution

October 20, 2010

With the environment continuing to drive the decisions being made in the construction industry, rooftops are becoming more than just the waterproofing element of a building. Rooftops have presented optimal areas to install photovoltaic’s, or PV systems. The benefits of a PV system are widely understood, but what gets missed is the negative impact PV systems can have on a roof.

The failure of most roofing membranes is chemical breakdown created by a combination of heat and oxygen. Failures occur in the field, at seams and at the perimeter of the roof. Studies and tests have shown that the aging process of a roof membrane doubles with a heat increase of 10C.

Although there are several suppliers of PV systems, there are two main types; building-integrated photovoltaic’s (BIPV) and rack mounted PV units. BIPV was first thought to be the best solution for solar installations, but quickly proved to be ineffective. BIPV’s are adhered directly to the membrane, and therefore have no elevation from the roofing membrane. This is acceptable in a warm US climate, but in Canada, the snow that accumulates throughout the winter covers the panels and makes them completely ineffective. The second problem, and one that creates a problem to the life cycle of a roof, is the increased amount of heat that is generated directly on the membrane. In hot climates, panel temperatures can exceed 200F on a sunny day.

Rack-mounted PV systems are installed in several ways, and can include an attachment to mechanical supports made through penetrations of the roof, laid without any attachment, or ballast supported. The additional penetrations through the roof can be easily addressed by installing proper flashing material. With the PV system sitting above the roof membrane, there is no additional heat transferred to the roof. In-fact, the shade created by the solar panels can keep the roof cool and increase its life expectancy.

Installing the proper PV system now, can save money in the future. Shortening the life of a roof means an earlier than expected re-roof and increased costs to remove and re-install the PV system.


Bothwell-Accurate Continues to Lead
the Charge in Environmentally Friendly Roofing Solutions

March 23, 2010

As the change to move to greener solutions proceeds, all aspects of business continue to be affected. Now, as the push to improve our environment becomes even stronger, we are facing an extended producer responsibility program or EPR. EPR means that the producers of products that use wrapping, packaging , labeling etc., will now be responsible for the disposal of the packing of those products.

“Among the categories to be targeted within the first 2 years of the EPR program are industrial, commercial and institutional paper, packaging, construction and demolition materials and electronic equipment”. The goal moving forward is that the cost of waste disposal will be incorporated into the purchase price of the product.

What does all this mean? The more non-recyclable products used on a job site, the higher the cost will be to the end-user.

With this in mind, we must look at solutions to combat the potential rise on the cost of roofing projects, and look no further then single ply roofing systems. Single ply roofing systems include PVC, TPO, and EPDM, and are excellent roofing systems in price, quality, and durability. Each system’s membrane is fully recyclable, thus saving costly landfill disposal fees.

A current project of Bothwell-Accurate’s involves an existing single-ply roofing system which has reached is serviceable life. Because this is a single ply system, we were able to determine that the majority of the insulation was dry through a thermographic scan. Our next step is to replace the small amount of wet insulation and place a new layer of insulation over the existing membrane. At this point we are ready to install a new, mechanically fastened TPO.

We had absolutely minimal disposal because the existing membrane stayed in place. Ultimately, we were able to save the customer money, produce a high quality roofing solution and continuing to support the movement to a healthier environment.



March 23, 2010


For more than 45 years, Carlisle’s products have set the standard for quality and performance in the commercial roofing industry. Carlisle repeatedly raises the bar through steady development and continuous introduction of innovative new products and technologies.

The Carlisle Roof Garden line is no different, providing architects and building owners a huge selection of vegetative roofing options. With these systems, Carlisle offers an unparalleled variety of single-source roof garden solutions that provide numerous benefits,,,,

Read More in the Roofgarden Brochure (PDF)


Carlisle’s Stormwater Retention System

November 1, 2009

Carlisle’s Stormwater Retention System

Stormwater management is a growing concern among building owners, especially in urban environments where many stormwater and sewer systems are outdated and unable to handle heavy rain falls. A Ballasted Stormwater Retention roof system from Carlisle can retain up to 70% of the water from a 24-hour rain event, offering building owners and developers an economical alternative to costly stormwater collection basins and associated land requirements.

During a heavy, one-inch rainfall, over 6,200 gallons of water would fall onto a 10,000 ft2 roof. Carlisle’s Ballasted Stormwater Retention System using two layers of moisture retention mat could retain up to 67%, or 4,177 gallons.

Read the Carlisle Stormwater Management Fact Sheet (PDF)


The FleeceBACK Adhered Roofing System

November 1, 2009

The FleeceBACK Adhered Roofing System

The FleeceBACK Adhered Roofing System incorporates Sure-Seal® (black) or Sure-White™ (white-on-black) non-reinforced EPDM or Sure-Weld reinforced TPO membrane laminated to non-woven polyester fleece-backing.

The membrane is fully adhered to an acceptable insulation or cellular or perlite lightweight insulating concrete decking with a two-component spray-applied, low-rise FAST Adhesive. Insulation, if used, can either be adhered to the substrate with the FAST Adhesive or fastened to the lightweight insulating concrete with an acceptable insulation fastener and plate.

Read the Carlisle FleeceBACK Concrete Deck System Fact Sheet (PDF)


Bothwell-Accurate Becomes a Leader in the Application of NVS Lightweight Insulating Concrete System

April 20, 2010


Lightweight Insulating Concrete Systems combine the unique properties of lightweight insulating concrete and Insulperm premium expanded polystyrene foam insulation board delivering a design that encapsulates the insulation board in insulating concrete.

This process provides fire protection, prevents air infiltration, and bonds the total insulation system to the substrate. Unlike rigid board, Siplast Lightweight Insulating Concrete is reroofable, and therefore a truly sustainable insulation solution.

The NVS mix is a 1:3.5 ratio of Portland cement volume to NVS Concrete Aggregate volume. NVS is engineered for use over non-venting substrates in new roofing, reroofing and re-cover applications.

Because of its higher compressive and tensile strengths, NVS requires only a 1-inch minimum thickness over the top of the Insulperm Insulation Board. Please click on the brochures to learn more. Lightweight concrete is most effectively applied between the months of April to November.

Siplast Lightweight Insulating Concrete Systems

Siplast Lightweight Insulating Concretes are composite systems that combine the unique properties of lightweight insulating concrete and Insulperm premium expanded polystyrene foam insulation board. The polystyrene insulation board can be installed in thicknesses necessary for high insulation values and in stair-step fashion, facilitating prompt drainage of water from the roof surface.

Read More about The NVS System (PDF)

Re-Roofing With NVS

Reroofing comes with its own specific set of problems. Tear-off is extremely disruptive to building occupants. Ponding water is difficult to remove, due to irregularities in the existing substrate. Some tapered roof insulations lose Rvalue over time. Construction and maintenance traffic damage the roof. And, while you are paying to have your original investment hauled off to the city dump, you have to worry about keeping the building watertight. When you think about it, reroofing an occupied facility is a bigger headache than an original roof installation.

You can take reroofing off your mind for a very long time with Siplast’s NVS Lightweight Insulating Concrete Roof Insulation System.

Read More about Re-Roofing With NVS (PDF)

Siplast NVS Resource Material (PDF Files)

LWIC Brochure

Canadian NVS Article

NVS Reroofing

Siplast LWIC Sustainable Bulletin Series - Number 1

Siplast LWIC Sustainable Bulletin Series - Number 2

Siplast LWIC Sustainable Bulletin Series - Number 3

Siplast LWIC Sustainable Bulletin Series - Number 4

Siplast LWIC Sustainable Bulletin Series - Number 5

Siplast LWIC Sustainable Bulletin Series - Number 6

Siplast LWIC Sustainable Bulletin Series - Number 7

Siplast LWIC Sustainable Bulletin Series - Number 8



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