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Commercial Roofing Contractors
Washington DC, Virginia, & Maryland
For Repair, Maintenance, & Installation

Our commercial roofing division offers a range of commercial roofing services for Washington DC, Virginia, & Maryland, including commercial roof repair, commercial roof maintenance, and commercial roof installation of flat and low-slope roofing systems. We have the expertise and experience necessary to handle a variety of commercial roofing projects, ensuring that your commercial property has a durable and reliable roof. Whether you need a simple repair or a complete roof installation, we can help you find the right solution for your needs.

Commercial Roofing Services in Washington DC, Virginia & Maryland

GoTech Roofing repairs, maintains, restores, and replaces flat and low-slope commercial roofs across Washington DC, Virginia, and Maryland. We work with TPO, EPDM, PVC, modified bitumen, built-up, and metal roofing systems, and with silicone roof coatings.

Roofer torching a modified bitumen membrane seam during a commercial flat roof repair

Commercial Roof Repair

GoTech Roofing repairs leaking commercial flat and low-slope roofs in Washington DC, Virginia, and Maryland, from emergency leak calls to planned repairs. Every repair starts by finding the true source of the leak with a visual survey, thermal infrared imaging, Tramex moisture scanning, and core samples where needed, because water often travels far from where it shows up inside. We repair open seams, failed flashings, curbs, drains, and penetrations on TPO, EPDM, PVC, modified bitumen, and built-up roofs, and tell you in writing whether repair, restoration, or replacement is the better long-term investment.

Roof inspector probing a seam on a white single-ply commercial roof during a maintenance inspection

Commercial Roof Maintenance

A commercial roof maintenance agreement keeps small problems from turning into leaks, tenant disruptions, or premature roof failure. GoTech Roofing inspects your roof at least twice a year, in spring and fall, and after major storms. On each visit we clear drains, reseal flashings and penetrations, and repair minor seam and membrane damage before it spreads. Every visit ends with a written report and photographs, which document the routine maintenance that manufacturer warranties generally require and give owners and facility managers what they need for capital planning.

Roofing crew installing insulation cover board during a large commercial flat roof replacement

Commercial Roof Replacement

When a commercial roof has reached the end of its service life, GoTech Roofing replaces it with a TPO, EPDM, PVC, modified bitumen, built-up, or metal roofing system matched to the building, its drainage, and its budget. Every replacement starts with core samples and moisture scanning to decide between a full tear-off and a re-roof over the existing assembly. It includes tapered insulation to correct ponding, rebuilt drains and curbs, and custom metal edge and coping fabricated in our own shop. As manufacturer-certified installers for Elevate, Carlisle, GAF, and Mule-Hide, we offer manufacturer No Dollar Limit (NDL) warranties of up to 30 years.

Roofer spray-applying a white silicone roof coating over a commercial flat roof with an airless spray gun

Silicone Roof Coating & Restoration

Silicone roof restoration renews an aging but structurally sound commercial roof at a lower cost than replacement. GoTech Roofing first confirms the roof is a restoration candidate with moisture scanning, core samples, and adhesion testing. We replace wet insulation and repair seams and flashings, then spray-apply a high-solids silicone coating that seals the roof, resists ponding water, and reflects the sun's heat. A properly applied system can last 10–20 years or more and qualifies for manufacturer NDL warranties.

What We Do

Recent Commercial Projects Washington DC, Virginia, & Maryland

Hundreds of completed commercial roofing projects, from documented roof replacements and restorations to the everyday repairs that keep buildings watertight.

  • Certifications6 Roofing ManufacturersTrained and certified installer for Elevate, Carlisle, GAF, Mule-Hide, Gaco, and Progressive Materials.
  • 100+ Five-StarCustomer ReviewsFrom commercial and residential clients across the DMV region.
  • A+ BBBRatingRated A+ by the Better Business Bureau.
  • WarrantiesNo Dollar Limit (NDL)Manufacturer-backed 5-30 YR NDL warranties available on qualifying commercial roofing systems.

Documented Case Studies

Each case study documents the existing conditions, the investigation, the specified system, and the verified results of a completed GoTech Roofing commercial project.

Aerial view of the historic turreted office building at 633 Pennsylvania Ave NW, Washington DC, with its white TPO roof and rooftop unitsTPO

Office / Historic · Washington, DC

Historic Office Building TPO Roof Replacement

Four failing Duro-Last roof levels were replaced with Elevate 80-mil TPO. All drains were rebuilt, slopes corrected, and 16 HVAC units and a 2-ton generator raised so the new membrane could be installed beneath them. 30-Year Elevate Red Shield NDL Warranty.

View the case study →
Overhead drone view of the completed white TPO roof on the shopping center at 150 E Wolfe St, Harrisonburg, VA, with rooftop HVAC unitsTPO

Retail · Harrisonburg, VA

Shopping Center TPO Roof Replacement

Three roofs totaling 25,564 SF. Two were re-roofed with Elevate 60-mil TPO and large water-shedding crickets, and a five-year-old third roof was preserved by correcting its drainage. 20-Year Elevate Red Shield NDL Warranty on the re-roofed areas.

View the case study →
Overhead drone view of the completed white TPO roof on the retail center at 7171 New Market Court, Manassas, VATPO

Retail · Manassas, VA

Retail Center TPO Roof Replacement

A failing 25,857 SF Duro-Last roof was torn off and replaced with Elevate 60-mil TPO, with all eight drains rebuilt and longstanding flashing deficiencies corrected while the tenants stayed open. 20-Year Elevate Red Shield NDL Warranty.

View the case study →
Overhead drone view of the embassy building at 1530 P St NW, Washington DC, with new white TPO roof sections framed by green patinated standing seam roofsTPO

Embassy · Washington, DC

Embassy Building TPO Roof Replacement

An 18,675 SF, 39-year-old modified bitumen roof was torn off and replaced with Elevate 60-mil TPO, correcting severe ponding, replacing all twelve drains, and integrating with the existing metal roofs on a compressed schedule. 20-Year Elevate Red Shield NDL Warranty.

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Commercial Roof Repair

Take Advantage of the NEW Section 179 Commercial Roof Deduction

Section 179 allows businesses to deduct the full purchase price of qualifying roof repairs or roof replacement purchased or financed during the tax year. Understanding how this deduction works can help you make better financial decisions for your business.

Section 179 can only be used if you acquired your non-residential property by purchase for use in the active conduct of a trade or business or your rental activities qualify as a business for tax purposes. You can't use it if your rental activity is an investment, not a business. Owning rental property qualifies as a business if you do it to earn a profit and work at it regularly, systematically, and continuously—either by yourself or with the help of a manager, agent, or others. Rental ownership, on the other hand, is an investment, not a business, if you do it to earn a profit but don't work at it regularly, systematically, and continuously.

For detailed information on the NEW Section 179 Commercial Roof Deduction, please visit our page:
Understanding the Section 179 Deduction for a Commercial Roof: A Deep Dive

First Start With A Commercial Roof Inspection

In order for us to advise you on which course of action to take concerning your commercial roof, you will need to find out the current condition of it. GoTech Roofing's Inspectors are certified and have inspected 1,000's of commerical roofs. A commercial roof inspection involves a thorough examination of the roof of a commercial building to assess its condition and identify any potential issues. The inspection is typically performed by a qualified roofing inspector who has the knowledge and experience to evaluate the roof and provide recommendations for repairs or other actions.

The first step in a commercial roof inspection is to visually inspect the roof for signs of visible damage. This may include looking for tears, punctures, or other types of physical damage that can weaken the roof and make it more susceptible to leaks or other problems. The inspector will also look for signs of wear and tear, such as fading, cracking, or other types of degradation that can indicate the roof is approaching the end of its useful life.

In addition to looking for visible signs of damage, the inspector will also check for any evidence of leaks or water damage. This may include looking for water stains on the ceiling, peeling paint, or other indications that water has penetrated the roof. The inspector may also use moisture meters or other specialized equipment to detect hidden leaks or areas of moisture accumulation.

Another important part of a commercial roof inspection is to assess the condition of the roofing materials and determine whether they are still in good condition and capable of providing adequate protection for the building. The inspector will look for signs of degradation or deterioration, such as cracking, splitting, or other types of damage that can compromise the integrity of the roof. They may also check the condition of the roofing seams and flashings, which are critical components that help prevent water from entering the building.

In addition to examining the condition of the roof, the inspector will also evaluate the overall design and installation of the roofing system. This may include checking the slope and drainage of the roof to ensure that water is being directed away from the building, and examining the ventilation system to ensure that it is adequate to prevent moisture buildup and protect the roof from damage. The inspector may also check the condition of any rooftop equipment, such as HVAC units or solar panels, and assess whether they are properly installed and maintained.

Once the inspection is complete, the inspector will provide a written report outlining their findings and recommendations for repairs or other actions. The report will include detailed descriptions of any problems that were identified, along with estimates of the cost and time required to fix them. The inspector will also include photographs and other supporting documentation to help the building owner or manager understand the condition of the roof and make informed decisions about how to address any issues that were identified.

Overall, a commercial roof inspection is an important step in ensuring the long-term health and performance of a building's roof. By identifying potential problems and providing recommendations for repairs or other actions, a commercial roof inspection can help protect the building and its occupants from the damaging effects of water and other environmental factors. For detailed information on a commercial roof inspection, please visit our page:

What Should Happen During a Commercial Roof Inspection?

New Ultra-White TPO Commercial Roof Installation
with All New Custom Metal Coping, Washington DC

GoTech Roofing just finished installing a New Ultra-White TPO Commercial Roof Installation with All New Custom Metal Coping. The existing flat roof was 25 years old and the metal coping was completely rusted and leaking in multiple places. In addition, the flat roof had an incorrect slope and water was severely pooling around the HVAC equipment and the outside roof walls. The GoTech Roofing Team installed multiple water shedding crickets and corrected the roof slope. This video is the next morning after a heavy rain. As you can see, no water pooling now. The Customer was given a Elevate/Firestone Manufacturer 30 Year Warranty.

Top 5 Most Common Commercial Roofing Types

Commercial Roofing Systems Compared
Roof System Typical Lifespan Warranty Available Best Use Relative Cost Maintenance
TPO 25–30 years 5–30 year NDL Most low-slope commercial roofs; energy-efficient white surface $$ Moderate Low
EPDM 20 years 5–20 year NDL Large, simple roofs; cold-climate flexibility $$ Moderate Moderate (seams)
PVC 20–25 years 5–20 year NDL Restaurants and roofs exposed to grease or chemicals $$$ Higher Low
Built-Up (BUR) 25–30 years 5–20 year NDL Roofs needing multi-ply redundancy and foot-traffic resistance $$$ Higher Moderate
Modified Bitumen 15–20 years 5–20 year NDL Smaller roofs, high foot traffic, overlay over existing modified bitumen $$ Moderate Moderate

Lifespans are typical ranges for professionally installed and maintained systems. Warranty terms depend on the manufacturer, system specification, and closeout inspection. NDL = No Dollar Limit manufacturer warranty.

epdm roof system diagram
01

EPDM Roofing

Ethylene Propylene Diene Monomer, also known as rubber roofing
EPDM consists of a large single-layered roll of durable synthetic rubber roofing membrane. It is installed by applying an acrylic bonding agent. It used to be the cheapest of the flat roof options, but since COVID it has become much more expensive. It is also one of the easiest flat roofing solutions to install. Because it is easier to install, property owners can save time and money during installation.

But, there are several disadvantages of EPDM. First, it is black in color and its rubber surface tends to heat up in the sun. This can have a negative impact on the heating & cooling bill of the property owner. Second, because EPDM is made of black rubber, it tends to expand and contract as it heats from the summer sun and cools during the winter. This can lead to seams coming apart over the years. Thus, EPDM flat roof systems need regular inspection and maintenance to stay watertight.

tpo roof system diagram
02

TPO Roofing

Thermoplastic Polyolefin

First introduced in the 1990s, TPO is a flat roofing solution that has become the most popular now. Recently, it has become less expensive than EPDM. TPO is made of a heat-reflective single-ply polypropylene membrane. One of the key advantages of TPO roofing is its durability. It is able to withstand extreme weather conditions, including hail, snow, and strong winds. This makes it an ideal choice for areas with extreme weather conditions. Another advantage of TPO roofing is its flexibility. TPO is a synthetic rubber material, which means it can stretch and move with the building as it expands and contracts with changes in temperature. This can help prevent cracking and other damage that can occur with other roofing materials. TPO roofing is also resistant to UV radiation, which can cause other roofing materials to break down over time.This type of flat roofing material is very lightweight and is laminated. The lamination keeps flat roof problems like algae or fungus from being able to grow on it. TPO is made of a white material. Many property owners like the white color as it reflects the Sun’s heat and helps in lowering the heating & cooling bill. TPO roofing is also relatively easy to install and maintain. It comes in large rolls that can be easily cut to fit the size and shape of the commercial roof. Once it is installed, TPO roofing requires little maintenance and can last for decades with only occasional inspections and repairs. TPO roofing lasts an average of 25 to 30 years.

pvc roof system diagram
03

PVC Roofing

Polyvinyl Chloride

PVC has been around longer than TPO. Like TPO, PVC comes in lighter colors and is therefore highly reflective of the Sun’s heat. It is debated that TPO has a slightly better tear and break resistance and superior weathering than PVC. Having said that, PVC has characteristics that certain customers prefer and/or need. PVC has better chemical resistance than TPO. Oils and greases do not get absorbed into it which would lead to weakening the membrane. With PVC, the welded seams can be rewelded over the roof’s lifetime, and are stronger than the material itself. These characteristics make PVC the preferred flat roof membrane for restaurants and other commercial buildings that have grease traps on the roof. Finally, different from other roofing membranes, PVC trim from manufacturing is entirely recyclable. Post-consumer membranes can be returned and made into new membranes.

built up roofing diagram
04

Built-Up Roofing

Also Known As BUR

Built-Up Roofing has a long track record and has been used in the United States for over 100-years. Built-Up Roofing is often referred to as tar and gravel roofing. Unlike the single-ply roofing options that are so popular today, this type of roofing is created by alternating layers of bitumen and fabrics together to form a “membrane”. That membrane is then finished with an aggregate layer or coating. Typically, underneath a BUR Roof is a rigid insulation layer. After that, there are layers of felts, fabrics, or mats that are saturated with bitumen. The most common being asphalt (which works as a better fire retardant than the others). Other types include cold-applied adhesive or coal tar.

When the roofers are spreading a gooey black substance on their roofs with mops and mechanical spreaders, you probably have been watching them create built-up roofs. Built-up roof finishes often resemble rocky beaches because they contain gravel, slag, and small rocks mixed in with the asphalt. Built-up roofing systems have a variety of options, including mats that reinforce the ply sheets and types of bitumens used.

Modified Bitumen tourch down roofing system diagram
05

Modified Bitumen Roofing

Also Known As Torch Down Roofing

One of the most popular and fastest-growing commerical roofing systems in commercial roof projects is modified bitumen flat roof systems (MBS). To seal the roof, a modified bitumen system uses a special combination of coated basemat layers instead of applying a hot liquid adhesive to the uncoated basemat. Modified bitumen flat roof systems have a reduced installation time when compared to a BUR flat roof systems. Another great advantage of a modified bitumen flat roof system is that you can install it on top of an older modified bitumen flat roof without taking off the old roof. Using this method, the flat roof actually becomes stronger and resists punctures due to the increased layers’ thickness. Not having to pay for the tear-off of the old modified bitumen flat roof systems is a huge cost-savings benefit.

One important factor with Modified Bitumen Roofing is that you can put a new layer on top of existing roof layers. And this makes the Modified Bitumen Roofing even stronger. Thus, Modified Bitumen Roofing can be cheaper than having to spend money on the tear-off of the old roof.

There are two basic types of modified bitumen flat roof systems: 1) Torch-down and 2) Self-adhering:

Flat Roof Torch-Down Systems are installed with the help of specially designed substrates using a special combination of layers to torch-seal the bituminous product layers.

Self-Adhering Flat Roof Systems (SAS) are similar to conventional modified bitumen flat roof systems. The Self-adhering Flat Roof system uses a coated bitumen basemat to provide a waterproof seal on low-sloping and flat roofs. When a torch cannot be used, this product is ideal. Garage roofs or extending porches that intersect with wood or vinyl siding are common places where you will see a Self-Adhering Flat Roof system.

Common Questions

Commercial Roofing FAQ

Direct answers to the questions commercial property owners and facility managers ask most, with examples from our documented projects.

How long does a commercial TPO roof last?

A properly installed commercial TPO roof typically lasts 25–30 years. Lifespan depends on membrane thickness, installation quality, drainage, and maintenance, and manufacturers offer No Dollar Limit (NDL) warranties of 5–30 years on TPO systems. GoTech Roofing installed an Elevate 80-mil TPO system across four roof levels at 633 Pennsylvania Ave NW in Washington, DC that carries a 30-year Elevate Red Shield NDL warranty.

Should I repair or replace my commercial roof?

It depends on what a commercial roof inspection finds. Some roofs can be repaired or restored to extend their service life, while others have failed membranes or saturated insulation that make replacement the better investment. A proper inspection combines a visual survey, moisture scanning, and core samples to tell the difference. At 150 E Wolfe St in Harrisonburg, VA, three roofs on the same shopping center received three different recommendations: two were re-roofed, and a five-year-old third roof was kept in service and its drainage corrected.

Can a new commercial roof be installed over the existing one?

Sometimes: building codes generally allow a new roof over an existing one only when there is no more than one existing roofing system and the assembly below is dry and sound. Wet insulation must be cut out and replaced first, and if two roofing systems are already in place the roof must be removed to the deck. At 150 E Wolfe St in Harrisonburg, VA, core samples showed a single existing system, so two roofs were re-roofed after the wet areas were replaced. At 2801 Pennsylvania Ave SE in Washington, DC, rotted decking along the gutter line required a full tear-off to the wood deck.

What is an NDL warranty on a commercial roof?

An NDL (No Dollar Limit) warranty is a manufacturer warranty that covers repairs to covered leaks for the full warranty term with no cap tied to the original contract price. It is issued by the roofing manufacturer, not the contractor, and only for systems installed by a manufacturer-authorized applicator and approved at closeout inspection. GoTech Roofing projects carry 20-year Elevate Red Shield NDL warranties at the 150 E Wolfe St and 7171 New Market Ct retail centers, and a 30-year Elevate Red Shield NDL warranty at 633 Pennsylvania Ave NW in Washington, DC.

How often should a commercial roof be inspected?

A commercial roof should be inspected at least twice a year, typically in spring and fall, and after any major storm. Regular inspections catch open seams, failed flashings, clogged drains, and ponding water before they become leaks, and manufacturer warranties generally require the owner to maintain the roof. GoTech Roofing commercial roof maintenance agreements schedule these inspections and provide written reports and photographs.

Does the Section 179 deduction apply to a commercial roof replacement?

Yes, in many cases: since the Tax Cuts and Jobs Act took effect in 2018, roofs on nonresidential buildings can qualify for the Section 179 deduction. The property must be used in the active conduct of a trade or business and annual deduction limits apply, so owners should confirm eligibility with a tax professional. GoTech Roofing's guide, Understanding the Section 179 Deduction for a Commercial Roof, explains how the deduction works.

What is the best roofing system for a commercial flat roof?

There is no single best system; the right choice depends on the building's use, roof size, foot traffic, budget, and drainage. TPO is the most popular low-slope system for its 25–30 year lifespan and energy-efficient white surface, PVC is preferred where roofs are exposed to grease or chemicals, and modified bitumen suits smaller roofs with heavy foot traffic. The comparison table on this page lists the typical lifespan, available warranty, best use, relative cost, and maintenance needs of TPO, EPDM, PVC, built-up, and modified bitumen roofs.

Is a roof coating an alternative to commercial roof replacement?

Yes, when the existing roof is a good restoration candidate: a properly applied silicone roof coating system can last 10–20 years or more at a lower cost than replacement. The roof must be structurally sound, and wet insulation and damaged areas must be repaired before the coating is applied. GoTech Roofing restored the modified bitumen roofs at 2105 Mt Vernon Ave in Alexandria, VA and 2330 Columbia Pike in Arlington, VA with Progressive Materials high-solids silicone, each with a 20-year NDL warranty.

Can a commercial roof be replaced while the building is occupied?

Yes: with phased work areas, daily dry-in, and tenant coordination, most commercial roofs can be replaced while the building stays open. Each work area is made watertight at the end of every workday, and rooftop equipment is managed so operations continue below. At 7171 New Market Ct in Manassas, VA, a 25,857 SF roof was replaced while the retail tenants stayed open, and the 150 E Wolfe St shopping center in Harrisonburg, VA remained fully tenanted throughout its 18-working-day project.

How do you find the source of a commercial roof leak?

The source is found by combining a visual roof survey with thermal infrared imaging, Tramex moisture scanning, and core samples, because water often travels far from where it appears inside the building. Infrared and moisture scans map wet insulation across the roof, and core samples confirm what each layer of the assembly is made of and whether it is saturated. At 2330 Columbia Pike in Arlington, VA, core sampling and moisture scanning located wet insulation for replacement, and ponding was traced to a rotted, upturned gutter line that was rebuilt.



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