JN Roofing and Window provides high-performance roofing for commercial/industrial constructions. We are dedicated to serving our customers in a professional manner and take pride in our work.

A flat roof is a type of covering of a building. In contrast to the sloped form of a roof, a flat roof is horizontal or nearly horizontal. Materials that cover flat roofs should allow the water to run off freely from a very slight inclination.

Benefits of flat roofs

A flat roof is the most cost-efficient roof shape as all room space can be used fully (below and above the roof) and as this roof allows easy revision/placement of solar panels [1] They also provide space for outdoor recreational use such as roof gardens. Applying a tough waterproofing membrane forms the ideal substrate for green roof planting schemes. A cold applied seamless system is highly durable and offers maximum resistance to root ingress.

Maintenance and assessment of flat roofs

General flat roof maintenance includes getting rid of ponding water, typically within 48 hours. This is accomplished by adding roof drains or scuppers for a pond at an edge or automatic siphons for ponds in the center of roofs. An automatic siphon can be created with an inverted ring shaped sprinkler, a garden hose, a wet/dry vacuum, a check valve installed in the vacuum, and a digital timer. The timer runs two or three times a day for a minute or two to start water in the hose. The timer then turns off the vacuum, but the weight of water in the hose continues the siphon and soon opens the check valve in the vacuum. The best time to address the issue of ponding water is during the design phase of a new roofing project when sufficient falls can be designed-in to take standing water away. The quicker you get the water off the roof, the less chance there is for a roof leak to occur.

All roofs should be inspected semi-annually and after major storms. During the roof inspection particular attention should be paid to the flashings around all of the roof top penetrations. The sharp bends at such places can open up and need to be sealed with plastic cement, mesh and a small masons' trowel. Additionally, repairs to lap seams in base flashings should be made. 90% of all roof leaks and failure occur at the flashings. Another important maintenance item, often neglected, is to simply keep the roof drains free of debris. A clogged roof drain will cause water to pond, leading to increased "dead load" weight on building that may not be engineered to accommodate that weight. Additionally, ponding water on a roof can freeze. Often, water finds its way into a flashing seam and freezes, weakening the seam.

EPDM Roofing Systems

Durability, design versatility and installation ease are among the many reasons ethylene propylene diene monomer (EPDM) is the most popular material for both new and reroof low-slope roofing applications. EPDM Roofing Systems are based on a high-performance synthetic rubber compound that provides outstanding weathering characteristics in climates worldwide. From office buildings and distribution warehouses to hospitals and schools.

TPO Roofing Systems

Thermoplastic single-ply roofing membranes are among the fastest growing commercial roofing products and have gained broad industry acceptance for their many performance and installation advantages.

As demand increases for heat-reflective and energy efficient roofing systems, thermoplastic polyolefin (TPO) single-ply roofing membranes continue to provide exceptional resistance to ultraviolet, ozone and chemical exposure.

Hi-Tuff roofing systems

Hi-Tuff roofing systems are based on the Hi-Tuff TPO membrane; a copolymer of polypropylene and ethylene propylene rubber that has been formed into a membrane sheet and internally reinforced with a heavy duty polyester scrim. A 'second generation' single ply product, Hi-Tuff marries the advantages of previous generation materials while eliminating their limitations. The result is a roofing membrane that is faster and easier to install yet offers outstanding resistance to weathering, temperature extremes, ultraviolet exposure and a wide variety of industrial chemicals.

COLOURS:Standard Hi-Tuff colours are white, grey and tan. Custom colours are available on special order, subject to minimum quantities and cost surcharges.

THICKNESSES:Hi-Tuff membrane is available in four different thicknesses: 1.1 mm (45 mil), 1.5 mm (60 mil), 1.8 mm (72 mil) and 2.0 mm (80 mil). The thinner membranes are acceptable for most applications, however thicker membranes should be considered in areas of exposed roofs (Designs A, E or F) that may be subject to heavy foot traffic, frequent roof top unit maintenance or vandalism. Heavy duty Hi-Tuff walkways may also be used in these areas.

HI-TUFF FLEECEis a special purpose membrane consisting of the standard Hi-Tuff membrane (in 1.1 mm or 1.5 mm thicknesses) laminated to a non-woven polyester fleece matting. The fleece acts as a cushion against rough surfaces and provides a mechanical means for securing the membrane with adhesive.

Hi-Tuff is a thermofusible membrane manufactured in different roll widths The membrane is welded together with a hot air gun to form a uniform membrane across the roof.

Hi-Tuff may be installed in a number of different methods, including "loose laid and ballasted" applications. It truly stands out in mechanically fastened or fully adhered systems, where its heavy duty scrim reinforcement and super strong, heat-welded seams offer the superior protection needed for a fully exposed application. Featuring an attractive, contour hugging surface in a truly light-weight assembly, Hi-Tuff is the preferred choice for many commercial and industrial roofing applications.

Consider, then compare all of the Advantages of a Hi-Tuff roof ...

For the Owner
Long-Term Performance - Hi-Tuff out performs competing roofing systems in just about every physical category. Cold temperature flexibility, seam strength, tear and puncture resistance and resistance to UV degradation are just some of the characteristics that make Hi-Tuff stand out as your best roofing choice for long term performance.

Hi-Tuff Roofs save Energy - Hi-Tuff roofs are Energy Star listed. Compared to traditional dark coloured roofs, a light coloured Hi-Tuff roof can yield significant reductions in air conditioning costs in the summer time.

Help reduce Global Warming - Even in more temperate climates, light coloured, heat reflective roofs can help reduce the "urban heat island effect" that occurs during the summer in major cities - a major contributor to global warming*.

Government Grants / Tax Incentives - In some jurisdictions, governments provide grants or tax incentives for owners who install white, heat reflective roofs. Consult with your local building authority.

Economical - Hi-Tuff can be economically installed in a variety of design configurations in either new or re-roof applications. In some cases the membrane can be installed over top of an existing roof to avoid the high costs of tearing-off and disposing of the existing roof.

Roof-top Advertising - Using different coloured membranes, your logo can be incorporated right into your roof! Ideal for low rise buildings in downtown cores or on airport flight lines.

Odor free Installation - Roofing with Hi-Tuff means roofing without asphalt and its noxious fumes.

For the Roofer
Fast, Efficient Installation - With pre-assembled fasteners and seam welding speeds averaging 12 to 16 feet per minute, a mechanically fastened Hi-Tuff roof goes on fast. You are more competitive because you can complete the roof much faster than conventional systems - saving both you and your customer money.

Reliable Heat-Welded Seams - Featuring an unusually wide seaming temperat

ure range, Hi-Tuff offers superior weld reliability even in the most difficult job site environments. Easy to Repair - Should mechanical damage occur, it can be easily found and quickly repaired. Aging has virtually no effect on the membrane's 'weldability' so it can be as easily repaired five years from now as the day it was put on.

Complete Line of Flashing Accessories - From pipe boots to corners, Hi-Tuff pre-fabricated flashings make the most troublesome details easier than ever.

Clean Installation - Based on a highly inert and homogenous polymer, Hi-Tuff is lead free and does not release chlorine gas during welding or combustion. Only the most minimum amount of adhesives and sealants are required to complete the system.

For the Specifier
Light-Weight - Most Hi-Tuff roofs weigh less than 1 lb / ft2 (4.9 kg / m2), including insulation. This can often yield considerable savings in a building's construction through reduced requirements for structural steel and footings.

Plasticizer Free - Unlike other thermoplastic membranes, Hi-Tuff is a rubber and contains no plasticizers that will leach out causing premature aging and embrittlement.

Resistant to Physical Abuse - The 1.1 mm thick Hi-Tuff membrane is one of themost puncture and tear resistant roofingmembranes on the market.Three levels ofthicker membranes are available to addressthe most demanding applications.

Chemical Resistant - Hi-Tuff is able to withstand prolonged exposure to numerous industrial wastes and chemicals. It is an ideal roofing membrane for roofs subject to high levels of airborne pollutants or vent stack effluents.

And most Important: Peace of Mind - Knowing that you have chosen for your customer the most durable, long-lasting roof available.

GARDEN ROOF® System

Garden Roof® Assembly allows the design professional to transform virtually any flat or sloped roof into a landscaped environment. Designed as a lightweight, low profile system, the Garden Roof Assembly can be safely installed on roof and plaza decks not engineered to handle the heavy load requirements of a traditional green roof. And because the assembly incorporates Hydrotech's Monolithic Membrane 6125®, a proven roofing/waterproofing membrane, the building owner can be assured of a water-tight structure.

The Garden Roof provides building owners and tenants with many ecological, technical and economic benefits. Some of the advantages of the Garden Roof Assembly include:

• Enhances building's appearance
• Adds space for tenant use and recreation
• One answer to the "Urban Heat Island" problem
• Stormwater management - retain 50%-90% of a typical rain fall on the roof
• Improves building's energy efficiency
• Processes airborne toxins and re-oxygenates the air
• Creates therapeutic and peaceful environments
• Total assembly warranted, from the deck up

Built-Up (Tar-and-Gravel) Roofing Systems

Most houses with flat or nearly-flat roofs are topped with built-up roofing, or "tar-and-gravel" roofing, made from fiberglass-based asphalt sheeting that is applied in layers, with hot bitumen mopped on between each layer.

The surface is coated with bitumen and a layer of gravel or crushed rock to hold the roofing material down and minimize damage from the sun and from abrasion. The light-colored gravel also reflects the sun’s heat. Built-up roofs can last from 10 to 20 years, depending on the severity of the weather.

Similar to built-up roofing is roofing made from a single layer of asphalt-impregnated material, called asphalt roll roofing. This is used more often on garages and outbuildings than on houses because of its relatively short life span (5 to 15 years). It is generally the least expensive roofing material available.

Motified Bitumen Roofing

Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures.

Increased resistance to brittleness at cold temperatures, greater flow resistance at high temperatures, and increased elasticity can be achieved by blending synthetic rubberized polymers with asphalt in lieu of modification. There are numerous surfacing options for this system which include a factory applied mineral surface, gravel surface, including “cool roof” coatings which are highly-reflective to save on building cooling costs. Mineral-surfaced MB products are typically furnished with white granules, but are also available in designer colors to match asphalt shingles or to otherwise compliment the building design.

MB gives designers and installers an even broader array of options. MB may be installed by the torch-application method, or “hot-mopped” like BUR, or applied with “cold-process” adhesives. The latest innovation with MB is the self-adhering sheet. Using special combinations of polymers to modify the underside of the MB sheet, the rolls are manufactured with a release paper. The installer removes the release paper and as the sheet is rolled out, it adheres itself to the substrate. This method eliminates the risks associated with the use of torches, hot asphalt, and is completely free of VOC (volatile organic chemicals) fumes during and after application.

Benefits of Modified Bitumen Roofing

• Proven track record of performance
• Superior waterproofing characteristics
• Broad range of application methods
• Wide choice of top-surfacing, including “Cool Roofing” options
• With insulation, provides an even better-performing building component
• High tensile-strength
• Available as part of a fire, wind, and/or hail rated roofing system
• Competitive life-cycle cost
• Available with flame-free and VOC-free installation
• Long-term warranties are available with many MB systems