Johnson Roofing Concepts, Inc specializes in Single-Ply roofing systems. For more than 38 years we have been installing and servicing commercial and industrial Single-Ply roofing systems. Our commitment to a positive outcome and customer experience makes us the roofing expert you can trust with your next project.
What is Single-Ply Roofing?
Single-Ply roofing is classified as flexible sheets of compounded plastic-derived materials that are used to cover and protect flat and low-sloped buildings. In the last 30 years, single-ply roofing has replaced older materials such as tarpaper, as the go-to roofing material for commercial roofing contractors. When properly installed, single-ply roofing systems offer an inherent advantage over traditional materials due to their strength, flexibility, and high durability.
Types of Single-Ply Systems Johnson Roofing Concepts Offer
• TPO • PVC • EPDM • MODIFIED • STANDING SEAM •
THRMOPLASTIC POLYOLEFIN (TPO)
Thermoplastic Polyolefin (TPO)
Thermoplastic polyolefin (TPO) 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, TPO single-ply roofing membranes continue to provide exceptional resistance to ultraviolet, ozone and chemical exposure. • Installation options are pictured in the table below •
TPO membranes are produced by calendaring with lamination, extrusion with lamination, or extrusion-coating techniques. TPO sheets are a blend of polypropylene and ethylene propylene polymers and usually are reinforced with polyester. TPO sheets contain colorant, flame retardants, UV absorbers and other proprietary substances to achieve desired physical properties.
- Sheet widths range from 6 feet to 12 feet wide
- Sheets are typically 40 mils to 100 mils thick
- Seams are sealed by heat welded with hot air
- TPO membranes commonly are white
Mechanically Attached Roofing System:In order to secure the single-ply membrane to the roof assembly, the membrane is attached with mechanical fasteners through both the insulation and decking material, typically at the seams.
Adhered Roofing System:The single-ply membrane is attached to the topmost surface of the roofing assembly through the use of adhesives, without penetrating the membrane. This method secures the membrane across the entire roofing assembly.
POLYVINYL CHLORIDE (PVC)
Polyvinyl Chloride (PVC)
What is PVC?
PVC roofing is one kind of single ply roofing, which means it consists of one layer manufactured in a factory. A PVC roofing membrane is made of thick, flexible UV-resistant thermoplastic material; it may also contain polyester or fiberglass, resins, pigments, plasticizers and other chemicals. The thickness of the roofing membrane varies by manufacturer.
Versatility of PVC Roofing
Although white is a common color since it reflects the sun’s heat, different colors are available. Lighter colors like tan, grey or cream are preferred, and some newer types of PVC roofing contain reflective elements and are also Energy Star or Cool Roof rated. Some brands of PVC roofing can be customized with colors or logos. Some brands have a design which looks like conventional shingles from a distance.
More About PVC
Reflectivity (for cool roofing)
Thermoplastics are provided in a wide variety of colors, although most often in light (cool) colors for higher reflectivity and, since they soften (by definition), with excess heat. Rather than pure white, light gray, tan, and most custom colors are off-white since roofs get dirty and brilliant white shows dirt the most. Cool roofs are most effective in hot climates where air conditioning and peak loads are of concern.
Probably more than any other membrane system, PVC trim from the manufacturing process can be 100 percent recycled, and post-consumer membranes are already being returned and recycled back into new membranes.
PVC membranes are weldable throughout their lifetime, remaining thermoplastic. This facilitates roof modification for new equipment, solar panels, and routine maintenance.
The life expectancy of a material has the greatest impact on environmental life-cycle assessment calculations. PVC membranes have many decades of proven performance.
Light in Weight
Systems are generally in the 45mil range, weighing roughly 0.25 pounds/square foot. More and more 60+ mil products are being promoted for longer life and greater resistance to impact and abrasion (likely with photovoltaic panels on the roof).
Depending upon the roof deck, mechanically fastened and fully adhered systems are first choices. Sheets can be factory fabricated into wide panels, reducing the number of seams that need to be sealed in the field. Fastener patterns can be modified depending upon expected wind loads. The recent introduction of double welds (the membrane is welded on both sides of the seam fasteners to distribute stresses) greatly increases wind resistance. Virtually all of the thermoplastic single-ply membranes used today have internal scrim reinforcement for better stress distribution and dimensional stability.
Welded seams are stronger than the sheet itself. This is a great advantage in vegetated roofs where root penetration is of concern.
Compatibility with PV
Flexible PV cells can be directly attached to PVC membranes, providing conformability to the substrate and better impact resistance with far fewer penetrations through the roof membrane.
ETHYLENE PROPYLENE DIENE MONOMER (EPDM)
A Single-Ply roofing material manufactured of an elastomeric polymer synthesized from ethylene, propylene, and a small amount of diene monomer. Because of its versatility in application methods, EPDM roofing may be used for any roof shape, slope, or height.
EPDM (ethylene propylene diene monomer) rubber roofing membrane has been an appealing choice for the low-slope commercial roofing industry for more than 40 years, with more than 500,000 warranted roof installations on 20 billion-plus square feet. Annually, EPDM accounts for over 1 billion square feet of new roof coverings in the United States and is the most frequently used roofing material in the marketplace. Building Design and Construction magazine and the National Roofing Contractors Association confirmed in their 2002-2003 market surveys that EPDM continues to be the number one roofing choice of architects, roof consultants and contractors for both new construction and replacement roofing projects.
Firestone SBS Modified Bitumen Roofing Systems incorporate a synthetic rubber-based technology which yields exceptional flexibility, even in extremely low temperatures. SBS membranes may be installed in hot asphalt, cold adhesive or heat welded.
Modified bitumen roof systems can be installed with the common torch method, asphalts, or cold adhesives. A standard SBS modified bitumen roof system is a two-ply system applied in rolls that overlap the edge of the previous roll.
Benefits of Modified Bitumen
♦ Very Durable
♦ Weather Resistant
♦ Easy to Repair
♦ Factory Manufactured rolls are easy to install and ensure quality control
♦ Flexible, expands & contacts easily
STANDING SEAM METAL
Standing Seam Metal Roofing
Standing-seam metal roofing is installed by running continuous metal panels down the length of the roof. These panels are usually made of Galvalume-coated steel but can also be made of aluminum, copper and various other metals. Each 12 to 19 inch wide panel overlaps the other concealing the
seam fasteners with a standing seam which runs continuously from the top of the roof to the edge. This seam can vary in height but is typically 1” to 2-1/2”, thus the name “standing seam.” The panels are held in place with clips that are concealed under the panel, thus allowing the panel to float or move back and forth.
Steel roofs are very durable and much more impact resistant
than shingles as long as you have an acceptable gauge of steel. Some companies
may try to use a thinner gauge of steel than recommended which is much more
flimsy and less durable and creates more oil canning in the panel. A metal roof
installed correctly will often last for more than 50 years. On top of this, metal roofs are fire retardant, recyclable
and require very little maintenance. Money will also be saved on your energy
bills because metal panels painted with lighter colors reflect much more heat
than asphalt shingles. These roofs also add a bright, impressive look to your
home which can really boost the property value.
Installing a standing seam metal roof can be an elaborate process which requires more time and craftsmanship. There are a very few roofing contractors who are able to install this roofing system correctly.