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Commercial Roofing Services
in Washington DC
Business, Commercial, and Industrial Roof Repair And Installation
We understand that roofing problems can spell disaster for businesses, so we strive to identify problems, provide solutions and work with the property owners and managers to ensure as few disruptions as possible.
Whether it’s commercial roof repairs, partial replacement, or complete re-covering systems, you can trust Dominion to do the job quickly and efficiently.
Commercial Roof Repair
- Composition Shingle Repair
- Flat Roof Repair
- Gutter Repair
- Industrial Flat Roof Repair
- Shingle Repair
- Siding Replacement
- Window Repair and Replacement
- Concrete Repair
- Roof Maintenance
- Leak Detection/Full Roof Assessments
- Preventive Roof Maintenance
Asphalt shingles are designed for moderate to steep pitched roofs that shed water quickly. These shingles are sometimes called composition shingles and about 80% of all pitched roofs in the USA are covered with them as they are the most affordable form of roofing available that will last 15 to 20 years. Asphalt shingles are composed of a base layer of fiberglass reinforcing mat and are then coated with asphalt to make the shingle waterproof. Lastly, ceramic granules are embedded on top to block ultra-violet light, protect the surface of the shingle from impact, and give it color.
The most affordable 3-Tab shingles have cutouts or tabs made along their long lower edge causes the shingle to look like three separate pieces when installed even though it’s only one. They are thinner and less expensive (30 to 40 percent less) than the architectural style and are the most popular shingle today.
There are different qualities of shingles that rank their life expectancy from 20 years to lifetime warranties. The thicker 3 dimensional or Architectural is a multi-layer, laminated shingle that produces a 3-dimensional effect on a roof and is heavier and more durable than the less costly 3-tab shingle designs.
The roof is a system comprised of many components, not just the shingles. There is the waterproofing underlayment (ice shield), the water-resistant underlayment (felt), possibly skylights, the attic ventilation, and the flashings- all are important to the success of a long-life system. Manufacturer’s warranties usually run 25 years for 3-Tab and 40 to 50 years for architectural. However, some studies, conducted by roofing manufacturers, have shown that primarily the problems occurring with roofs requiring replacement before their predicted lifespan find the problem lies more in faulty installations rather than roofing materials.
Pitched Roof Installation
Flat/Tapered Roof Installation
Most Commercial building managers with low to high slope roofs look to metal roofing as a way to get a durable long-lasting roof that is both affordable and very quickly installed. Plus, it comes in many styles and colors and is easily coated after installation to provide additional waterproofing, anti-rust, and UV protection.
Metal Roofing is used quite extensively in agricultural roofing applications in the form of 5-V metal roof panels because it is the most affordable metal roofing product out there and will last a long time on a barn. However, this roof is nailed directly to the roof decking and after many years of temperature variations causing expansion and contraction could cause the nail holes to expand then water could seep down into the building. This is not much of a problem in a barn but in another situation, it could be. Changing the 5-V panels to interlocking standing seam panels would prevent leaks from weathered nail holes but would also be more expensive. Contractors can use screw-down fasteners with rubber washers to also alleviate the problem.
Metal panels come in 3 options foam insulation-backed panel, exposed fastener, and seamless interlocking panel. Speed of installation is quick, especially with the larger panels. Metal panels are so light in weight that it works well as a roofing material to put over an old roof without a tear-off.
Slate performs well as a low-maintenance and longed lived roofing material: It is a very dense structure that makes it water repellent, fireproof, and withstands freezing and thawing cycles well. These roofs can easily last 200 years or more (depending on the type of slate used and professional installation methods). Slate durability between the regions of origin differs.
Modified Bitumen Roofing System
This roof is manufactured on the roof with roofing layers of polyester or fiberglass impregnated with bitumen (a black viscous mixture obtained naturally or a petroleum distillation residue). Modified Bitumen roofs are installed by rolling out the roofing material as its being heated with a blow torch to allow the material to adhere to the roof surface. There are also peel and stick membranes available. This roof is stronger and more resistant to weather than the BUR roof.
Modified Bitumen membranes are strong and resist tearing because they are reinforced with fiberglass, polyester, or a combination of the two. The tar or bitumen is the waterproofing substance within the fabrics that when heated with the torch becomes an adhesive to firmly attach itself to the roof deck. Topping off the roofing membrane with gravel is not necessary because they already have a mineral-based granule surface that protects the membrane from UV rays and minor impacts.
EPDM (Ethylene Propylene Diene Monomer) is used to create a single-ply rubberized roofing membrane. EPDM is sold in a range of widths of 7.5 to 50 feet and in 2 thicknesses, 45 and 60 mils. It can be installed as one complete membrane or one with seams connected with adhesives or specially formulated tape.
Built-Up Roofing (BUR)
Tar and Gravel Flat Roof System (BUR)
The Tar and Gravel flat roofing system or Built-Up-Roofing is manufacture on the roof beginning with coal tar heated in a kettle or tanker to a temperature high enough to be easily spread. The tar is applied to the roof surface with a mop or spreader to be followed by a layer of felt or fiberglass fabric (produced in a standard width of 36 inches). Then, repeat the process till you get the number of layers wanted (a four-ply roof means the roof has four layers of roofing membrane). The final layer of tar will be topped with enough gravel to cover the entire roof surface.
The average lifespan of these roofs is 30 years with periodic maintenance (some are still structurally working well beyond 50 years).
This type of roof is self-healing: at temperatures above 70 degrees, the tar begins to soften and flow into lower areas, such as small cracks or punctures within the felt or fiberglass fabric layers.
Synthetic roof underlayment is a newer option compared to asphalt-saturated felt. It has been around since the early 2000s and has become more popular in recent years. Synthetic underlayment has plenty of positive attributes such as longevity, durability, temperature tolerance, heat retention, and more. However, the major drawback with synthetic underlayment is the price, which can sometimes reach prices five times higher than traditional felt rolls.
Thermoplastic is a plastic or synthetic rubber-like substance that softens when heated but hardens upon cooling. TPO membranes are single-ply roofing membranes that come in varying lengths up to 100-feet-long and 6 to 12 feet wide. They are typically 40 to 100 mils thick with a highly reflective white top protecting the dwelling from solar heat gain.
Choice of 3 types of installations attached with fasteners, glued directly to the roof, and seams between TPO membranes are heat welded, as well as, around roof perforations, such as chimneys, vents, cables, and pipes. TPO membranes seams that are heat welded and once cool become a very strong bond.
The TPO sheets contain flame retardants, UV absorbers, and other ingredients to achieve desired properties.
When the TPO membrane ages, the top layer of it will shrink, crack, craze, and generally deteriorate. If the roofing membrane has numerous cracks and has pulled away from the seams, then it may be time to replace the membrane. Generally, most roofs can handle two layers of membrane. However, it may be best to know if there is moisture damage underneath. The insulation may have mold from the moisture damage and need replacement. The wood framing may have also developed rot and need repair.
Polyurea is a liquid or spray coating that is used successfully for waterproofing flat roofs, Polyurea forms a seamless monolithic waterproof coating over surfaces that not only protects against leaks, rust and erosion, it can also stretch and shrink with the surface during climate change.
Polyurea coatings have been proven to be flexible, and durable protection over building materials that are degraded by the Sun’s rays, rain, and other climate changes- we have had 3 decades to study their performance. The formulations have improved during this time and now these coatings are often used to repair Roof surfaces that are leaking. Some formulas will dry within 4 to 6 hours- a big advantage when you need a protected structure back in service.
Metal Exposed Fasteners
Concrete Installation Services
Water Heater Vents Installation
Contact Us Today For Your Commercial Roofing
Have questions about your property’s roofing needs? Contact one of our roofing experts or call DPR at (800) 971-6995 today for more information or to receive a free quote from one of our commercial roofing professionals.
View examples of our recently completed projects. Let us know if you have any questions.
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