Commercial Flat Roofs
We specialize in built-up tar and gravel, modified bitumen (multi-ply), and single-ply roofing systems. We can add slope to existing flat roofs, and we offer custom-designed energy-efficient insulation systems. We also install Energy-Star rated coating systems, shingles, concrete or clay tile, slate, stone-coated metal panels, standing-seam metal panels, and exposed fastener metal panels. We have factory-trained technicians for installation and repair of all types of roofing systems. We provide a roofing system warranty that covers labor and materials for twenty years (or longer).
Garden Roofs are becoming a very popular choice in the Kansas City area. They can sustain shrubs, trees, pet areas, walkways and benches with their complex structural support, irrigation, drainage and root protection layers. We understand that garden roof requirements are unique, both structurally and financially. Whether discussing emergency situations or the long-term return on investment for your facility, we'll provide an accurate assessment of the roofing construction, suitability and condition of your roof for your operational needs.
Built-Up Roofs (BUR)
A built-up roof consists of multiple plies of roof felts, laminated together with bitumen. Built-up roof material can include layers of bitumen-saturated felt, coated felt, polyester felt or other fabric. A surfacing is generally applied and can be asphalt, aggregate (gravel or slag), emulsion or a granule-surfaced cap sheet.
Built-up roofing systems are one of the oldest and most durable systems available, due in large part to their success and proven reliability. These roof systems are commonly referred to as tar and gravel roofs. They are typically composed of alternating layers of bitumen and reinforcing fabric which creates a finished membrane. Multiple layers provide extra protection and perform well in extreme weather conditions. Built-up roofs are especially resistant to damage from wind, hail and driving rain.
Built-up roofing systems are easy to repair, and are ideally suited for applications requiring a high level of redundancy. The number of plies in a cross-section is the number of plies on a roof. A four-ply built-up roof has a four-ply roof membrane construction. Sometimes a base sheet, used as the bottom ply, is mechanically fastened. Built-up roofs generally are considered to be fully-adhered when applied directly to roof decks or insulation. A built-up (BUR) roofing system is the right choice if your building was originally constructed with a BUR roofing system. Most commercial properties were built using a built-up roofing system.
- Full removal of the existing roof is often indicated.
- A new Built-up roof will last longer with removal of the old roof (down to the deck, prior to installing the new one), because damaged decking can identified and repaired.
- Local weather conditions contribute to the longevity of service life for a built-up roof.
- The steeper the slope and the less severe the weather conditions, the longer a roof will last. High winds and hail can compromise a roof in rather quickly.
- The most important contributor to a good roof system is proper installation.
- The manufacturer of the products used in your built-up roof will provide a warranty that covers defects in the manufacture of the roof membrane. When your project is complete, we will provide you with a certificate so that you can register the manufacturer's warranty.
- We will provide you with a warranty covering our workmanship. This will cover installation and related issues. The warranty identifies what items are covered, and what will void them.
Learn about the Advantages of a Built-Up Roofing System.
Long popular in Europe, rooftop garden (green roofs) and plaza rooftops have begun to appeal to businesses, cities and even homeowners as an attractive way to promote and support the environment, while solving the same challenges met by conventional roofs. Urban green roofs create rooftop parks and landscapes, using shrubs, trees, flowers, grass, patios, walkways, trellises, firepits and benches, without disrupting infrastructure. They take a neglected space and make it highly versatile.
There are two types of garden roofs (also known as green roofs). Intensive green roofs are essentially elevated parks. They can sustain shrubs, trees, walkways and benches with their complex structural support, irrigation, drainage and root protection layers. Extensive green roofs support a lighter mixture of hearty native ground cover that requires little maintenance. Extensive green roofs usually exist solely for their environmental benefit, and don't function as accessible rooftop gardens.
See a dozen examples in our Garden and Plaza Roof Gallery.
Modified Bitumen Roofs
Modified bitumen is asphalt with added modifiers to give it a plastic or rubber-like property. Common types of modifiers are Atactic Polypropylen (APP) and Styrene Butadiene Styrene (SBS). Rolls of modified bitumen membrane cover an area of over 100 square feet. Surfacing s for these roll materials consist of mineral granules, aluminum, copper, or an aggregate such as gravel or slag. Modified bituminous roof membranes continue to be popular option for low-sloped roofs, due to their proven performance. Historically these products have been torch-applied, mop-applied using hot asphalt, or applied with solvent-based adhesives.
Additional information about APP and SBS Modified Bitumen Roofs.
Polymer-modified bitumen sheets are made with polyester and/or glass-fiber reinforcements. Most manufacturers of Modified Bitumen produce material with reinforcements that are filled, saturated or coated with very fine minerals, such as sand, mica or talc. All polymer-modified bitumen coated sheets are factory-coated on one or both sides with modified bitumen. The sheets are surfaced on one or both sides with sand, mica or talc. The polymer-modified bitumen sheets are produced in a variety of weights, and with a variety of reinforcements. Many smooth-surfaced sheets are used as base sheets, inter ply sheets and top ply sheets in multiple-ply modified bitumen membranes. Granule-surface and metal-foil laminate sheets generally serve as cap and flashing sheets. Once all steps have been completed, flashings are then applied. This provides waterproofing around the roof perimeter, equipment and projections.
Components of a Modified Bitumen Roofing System
- The R-Value. Insulation provides the R-Value value and stable substrate for the roof system.
- Modified Base Sheet/Ply. Either a modified or unmodified base or ply sheet used under a modified bitumen top ply.
- Modified Bitumen Membrane. A factory fabricated sheet consisting of a copolymer modified bitumen, typically reinforced with polyester fiber glass of a composite carrier.
- Adhesive. Actual waterproofing material and bonding agent that is applied either hot or cold.
- Surfacing. Provides UV protection and a weathering surface that can be either factory or field applied.
Learn about the Advantages of a Modified Bitumen Roofing System.
Single-Ply Roofs (EPDM, PVC, TPO)
Several highly-successful Single-Ply roof membrane products hit the roofing market in the 1970's. Built-up roofs met with some stiff high-tech competition. The single-ply roofs typically contain a rubber or polymer membrane.
Thermoplastic Olefin/Polyolefin Thermoplastic (TPO) and Polyvinyl Chloride (PVC) roof membranes, are flexible sheet materials that are used in one-ply or one-layer configurations. Constructed from ethylene propylene rubber, the thermoplastic roof membrane's chemical and physical characteristics allow it to repeatedly soften when heated and harden when cooled. Additionally, because of the chemical nature of thermoplastic membranes, the sheets are typically seamed by heat welding with hot air.
Properly installed single-ply roof systems have service lives ranging from about 10 years to 20 years, depending upon the type of installation. When deciding whether a single-ply membrane roofing system is right for you, it is important to first consider whether the building is suited for a single ply membrane at all. Generally, single ply membrane roofing is appropriate when weight is a consideration, the roof has adequate slope, structural movement is expected, and the installation involves recovering an existing membrane or installing in cold weather.
Ethylene Propylene Diene Monomer (EPDM) Terpolymer is simply a product consisting of three distinct monomers. EPDM is classified as a Thermoset material, which means it is either fully-cured prior to being installed, or that it cures during natural weathering after installation. EPDM roofs are single-ply membranes — there is only one ply of roofing material, not multiple plies laminated together.
EPDM is a rubber material whose principal components consist of the compounds ethylene and propylene. A flexible rubber matrix forms when a small amount of diene is added to the mix. EPDM is available reinforced or unreinforced with both commonly used; it's also available in either a cured (vulcanized) or uncured (non-vulcanized) state. Vulcanized EPDM is the most common with non-vulcanized often used for flashing purposes.
EPDM has been used in the USA since the 1960's. It is one of the most common types of low-slope roofing materials available, because it is relatively inexpensive, simple to install, and fairly clean to work with, when compared to conventional built-up roofs. There aren't the odors and fumes that accompany built-up roofs, which appeals to many property owners and managers.
Polyvinyl Chloride (PVC) membrane is a roof membrane composed of only one layer of material. PVC roofs are specially designed to withstand ponding water. A PVC membrane is welded together with hot air (no open flame) to eliminate all seams so moisture can not pass through. PVC roofing systems reflect nearly 90% of the radiant heat of the sun, thus lowering energy costs substantially, especially in high-heat and high-sunlight areas such as the southwestern United States.
- Fire-safe material
- Energy Efficient
- Good weather resistance
- Good long-term performance for a low slope roof.
- Not intended for high rain or snow areas.
Thermoplastic Olefin or Polyolefin (TPO) membranes are single-ply roof membranes constructed from ethylene propylene rubber. They are designed to combine the durability of rubber with the proven performance of hot-air weldable seams. They have been tested as having excellent resistance to ozone, are algae-resistant, environmentally friendly and safe to install.
The material's manufacturers are so confident in properly welded seams that the material is sometimes advertised as a monolithic (seamless) roof. Seam strengths are reportedly 3 to 4 times those of EPDM's adhesive and tape seams. TPO is highly resistant to tears, impacts, and punctures with good flexibility to allow for building movement. TPO's are available in white, light gray, and black with thicknesses of either 45 mils (.045") or 60 mils (.060"). The width of the membrane depends on the manufacturer but they usually come in widths of six to six-and-a-half feet and are one-hundred feet in length.
TPO membranes are installed fully-adhered, mechanically-attached or ballasted. Fully-adhered means that the roof is glued to the substrate using a special adhesive. What actually happens is the glue creates a chemical bond with the membrane. Ballasted simply means the membrane is loose laid over the top of the roof, sealed at all penetrations and around the perimeter, and then a ballast is put on it to hold it in place.
Ballast usually consists of smooth, round, river rock 2" to 3" in diameter and is applied at a rate of 1,000 to 1,200 pounds per roof square. Sometimes concrete pavers are used in their place. These average 20 pounds per square foot. Mechanically-attached membranes are those that use some type of special screw-type fastener to secure it. The type of fastener will depend on the type of substrate but all fasteners are generally screw-type fasteners.
- Fully-adhered means that the roof is glued to the substrate using a special adhesive, where the glue creates a chemical bond with the membrane.
- Mechanically-attached membranes are those that use some type of special screw-type fastener to secure it. The type of fastener will depend on the type of substrate, but all fasteners are generally screw-type fasteners.
Learn about the Advantages of Single-Ply (TPO) Roofing Systems.