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TPO Roofing Contractors in Leesburg & Loudoun County, VA
TPO Roofing Services
TPO roof installation in Loudoun County runs $7 to $12 per square foot installed, and a properly specified system lasts 20 to 30 years depending on membrane thickness.
TPO — thermoplastic polyolefin — is the most widely installed commercial low-slope membrane in the country, and for good reason in this climate. The white reflective surface cuts cooling load through a Virginia summer, and the seams are heat-welded rather than glued, which produces a bond stronger than the membrane itself.
Loudoun Roofing installs and replaces TPO on commercial buildings across Leesburg and Loudoun County — office and flex space, retail, warehouse and light industrial. See commercial roofing for everything else we do, or commercial roof replacement if you’re weighing repair against replacement.
TPO vs EPDM: Which Should You Specify?
These are the two systems most commercial buildings in Loudoun County end up choosing between. Both work. They fail differently and suit different buildings.
TPO
- White and reflective, so it reduces cooling load through the summer. On a building with significant air conditioning demand this is a real operating saving, not a marketing point.
- Heat-welded seams. The sheets are fused, not adhered — the seam ends up stronger than the surrounding membrane.
- Good puncture resistance, which matters on roofs with regular foot traffic for equipment servicing.
- The formulation has changed over the years. Early TPO had a poor reputation and some of it is still repeated; current membranes from established manufacturers are a different product.
EPDM
- Black, so it absorbs heat. A disadvantage in July, arguably an advantage in February — it sheds snow faster.
- Decades of proven performance. The longest real-world track record of any single-ply system.
- Handles freeze-thaw well, and stays flexible at low temperatures.
- Seams are adhered rather than welded, which historically made them the weak point — though seam tape technology has improved considerably.
Which One for Your Building?
TPO usually wins where cooling costs matter — retail, office, anything with heavy rooftop air conditioning — and where the roof gets walked on regularly.
EPDM often makes more sense on a re-roof where the existing system is already EPDM, on buildings where summer cooling load is not a significant cost, and where the simplest possible detailing is preferred.
If you’re replacing an existing roof, what’s already up there carries real weight in the decision. We’ll tell you which we’d specify and why, rather than defaulting to whichever we happen to buy more of.
roofing
Our Services
Roofing Services
Our crews are trained in the latest safety protocols, material handling, and installation techniques. Each member is vetted, insured, and committed to getting the job done right the first time. We frequently complete OSHA-certified safety training and maintain up-to-date licenses.
Membrane Thickness: The Spec That Decides Everything
TPO is sold in different thicknesses measured in mils, and this single choice drives lifespan, warranty tier and price more than anything else in the quote.
- 45-mil — the thinnest commonly specified. Lowest cost, shortest warranty, and rarely worth it on a building you intend to keep.
- 60-mil — the standard specification for commercial work, and what we recommend for most buildings. Good balance of cost and service life.
- 80-mil — for roofs with heavy foot traffic, significant rooftop equipment, or where the longest possible warranty matters.
This is the number to check on every bid you receive. A quote using 45-mil will look cheaper than one using 60-mil and is not the same roof. If a proposal doesn’t state the thickness, ask before comparing it to anything.
Attachment Method
How the membrane is fixed to the roof matters as much as the membrane itself, and it depends on where the building is.
- Mechanically fastened — screwed through to the deck at the seams. Faster and less expensive, and fine on most sheltered sites.
- Fully adhered — bonded across the whole surface. More expensive, better wind uplift performance, and quieter in high wind.
In western Loudoun — Purcellville, Round Hill and out toward the Blue Ridge — wind exposure is materially higher, and a fully adhered system is often worth the premium where a mechanically fastened one would be adequate further east. The National Weather Service office in Sterling issues the high wind warnings for this area.
Insulation
Loudoun County sits in climate zone 4, and the Virginia Uniform Statewide Building Code requires a minimum of R-30 continuous insulation on low-slope commercial roofs with insulation entirely above the deck. That’s a fixed cost in any compliant TPO installation here, and a quote priced well below the going rate is worth checking against it.
Our Installation Process
- Assessment. Free inspection including core samples on a replacement, to establish whether the existing insulation is dry and whether a recover is possible.
- Specification and proposal. Membrane thickness, attachment method, insulation R-value, flashing and penetration count, warranty tier, timeline and cost — itemized so it compares against any other bid.
- Permits. Pulled by us, with staged inspections built into the schedule. Loudoun County Building and Development handles these, and inside Leesburg town limits a Town of Leesburg zoning permit is needed first.
- Installation. Phased so the building keeps operating, with no more deck opened than can be closed the same day.
- Close-out. Manufacturer and workmanship warranties in writing, plus photographic documentation.
We work to National Roofing Contractors Association guidelines on every commercial installation.
Looking After It Afterwards
TPO is low-maintenance rather than no-maintenance, and most manufacturer warranties require documented upkeep to stay valid. We’ve written a detailed guide covering cleaning, inspection intervals and what to watch for — see TPO roof care.
Roofing Materials Tailored for Virginia’s Climate
Virginia’s weather ranges from hot, humid summers to cold, icy winters, placing significant stress on roofing systems. That’s why we recommend proven, high-performance materials for local multi-family properties:
- Architectural Asphalt Shingles: More durable and visually appealing than 3-tab asphalt shingles, these provide superior wind resistance and can last up to 30 years.
- TPO Roofing: Ideal for low-slope or flat roofs, TPO membranes are highly reflective, reducing cooling costs and resisting algae buildup.
- Standing Seam Metal Roofing: Increasingly popular in Northern Virginia, this option offers extreme durability and longevity, lasting up to 50 years with minimal maintenance.
- Roof Coatings: Elastomeric coatings help extend the lifespan of existing roofs by up to 10 years, making them a cost-effective solution for properties not ready for full roof replacement.
What Does a TPO Roof Cost?
$7 to $12 per square foot installed in Loudoun County for a 60-mil system with code-compliant insulation. On a 10,000 square foot building that’s roughly $70,000 to $120,000.
What moves it:
- Membrane thickness — the largest single variable. 45-mil to 80-mil is a meaningful price difference and a meaningful warranty difference.
- Attachment method — fully adhered costs more than mechanically fastened, and is worth it in exposed locations.
- Tear-off or recover — tear-off adds roughly $1 to $3 per square foot. See commercial roof replacement for how that decision gets made.
- Penetrations — every HVAC curb, vent and drain is a detail to flash. A roof crowded with equipment can run 15 to 30% above a clear one of the same size.
- Square footage — larger roofs cost less per foot, noticeably above 50,000 square feet.
Across a 25-year service life, the difference between a 45-mil and a 60-mil system is usually recovered several times over. The cheaper roof on installation day is rarely the cheaper roof.
TPO Roofing Across Loudoun County
Ashburn, Sterling and Dulles — the county’s data centre and light industrial corridor, and where most of our TPO work happens. These buildings carry heavy rooftop cooling equipment, which is exactly where a reflective membrane earns its cost and where the penetration detailing has to be right. Much of this stock went up from the late 1990s, so a good deal of it is now at replacement age.
Leesburg — office and flex space along the Route 7 and Route 15 corridors, plus retail. Older downtown commercial buildings sometimes carry two existing layers already, which forces a tear-off rather than a recover.
Aldie and the Route 50 corridor — mixed commercial and light industrial, and an area we already work in regularly.
Purcellville, Round Hill and western Loudoun — higher wind exposure, which changes the attachment specification as above.
Why Choose Loudoun Roofing
- We state the membrane thickness on every proposal. If a competing bid doesn’t, that’s the first thing to ask them.
- We specify the attachment method for the site, not the one that’s quickest to install. Wind exposure in western Loudoun is genuinely different from Ashburn.
- Licensed and verifiable — check any Virginia contractor licence free through the Department of Professional and Occupational Regulation, ours included.
- Commercial and residential since 2001 — a 20-year membrane warranty is only worth the company standing behind it.
- Itemized proposals that can be compared line for line against any other bid.
Testimonials
What they’re saying about us
✦ What customers say
Customers most often say Loudoun Roofing responds quickly to leaks and storm damage, often the next day, and that owner Esteban inspects both the roof and the attic and sends before-and-after photos of every repair. Many reviewers describe honest advice that fixes the actual problem instead of pushing a full replacement, with fair, detailed estimates. Homeowners across Loudoun County and Northern Virginia also mention on-time crews, spotless cleanup down to the last nail, and Keylah in the office keeping them informed.
AI-generated summary of customer reviews, updated October 9, 2026.
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Frequently Asked Questions
What is TPO roofing?
Thermoplastic polyolefin — a single-ply membrane for flat and low-slope commercial roofs. It’s supplied in rolls and the seams are heat-welded rather than glued, which fuses the sheets into a single surface. The white finish reflects sunlight and reduces cooling load.
How much does TPO roof installation cost?
$7 to $12 per square foot installed in Loudoun County for a 60-mil system with code-compliant insulation — roughly $70,000 to $120,000 on a 10,000 square foot building. Membrane thickness, attachment method and the number of rooftop penetrations move it within that range.
What thickness of TPO should I specify?
60-mil for most commercial buildings. 80-mil where there’s heavy foot traffic or significant rooftop equipment, or where you want the longest available warranty. 45-mil is rarely worth it on a building you intend to keep. Always check which thickness a quote is based on, because it’s the largest single price variable.
TPO or EPDM — which is better?
Neither is universally better. TPO’s reflective surface reduces cooling costs and its heat-welded seams are very strong, which suits buildings with heavy air conditioning demand. EPDM has the longer proven track record and handles freeze-thaw well. On a re-roof, what’s already installed carries real weight in the decision.
Can TPO be installed over an existing roof?
Sometimes. A recover avoids the tear-off cost and disruption, but only where the deck and insulation are dry and the building doesn’t already carry two layers — Virginia’s code limits how many coverings can be stacked. We take core samples before recommending it, because recovering over wet insulation seals the water in and voids the warranty.
How long does a TPO roof installation take?
Most mid-sized commercial buildings take one to three weeks. Roofs crowded with rooftop equipment take longer than the square footage suggests, because the flashing details around each penetration are the slow part.
Will we have to close the building during installation?
No. We phase the work so sections are opened and closed the same day where possible, and stage materials so entrances, loading areas and parking stay usable. Retail and schools get scheduled around trading hours and term dates.
What warranty comes with a TPO roof?
The manufacturer’s warranty on the membrane, typically 15 to 30 years depending on thickness and system specification, plus our workmanship warranty on the installation. Most manufacturer warranties require documented maintenance to remain valid — worth reading the terms rather than filing them.
Is TPO a good choice for Virginia's climate?
Yes, particularly for buildings with significant cooling demand. The reflective surface works hardest in a Northern Virginia summer, and modern TPO formulations handle the freeze-thaw cycling well. In exposed western parts of the county the attachment method matters more than the membrane choice.
Do you repair TPO roofs as well as install them?
Yes. Most TPO repairs involve re-welding a failed seam or patching around a penetration, and both are straightforward when caught early. If the membrane has reached the end of its service life, we’ll tell you that instead of selling you a repair that won’t hold.
