$1.122 billion in 2022 revenue. The biggest commercial roofer in North America. Zero SEC filings. No S-1 has ever been filed. No PE recapitalization, no SPAC, no roll-up participation. Edward B. Dunlap started CentiMark Corporation in the basement of his Pittsburgh home in 1968 with $1,000 and one employee. Fifty-four years later, Tim Dunlap reported $1.122 billion in sales, a 12% increase from the year the company crossed the billion-dollar threshold. The Dunlaps never raised a dollar of outside equity to get there. This post is about why — and what a roofing-company owner being pitched on PE or IPO today should actually take from it.
The setup — a company big enough to go public, long before the idea was fashionable
CentiMark was public-market eligible by the 1990s. They chose not to engage — not because they couldn't qualify, but because they didn't need to.
By the time most roofing PE roll-ups were getting started, CentiMark had already built what they were trying to build — without outside capital, without a single acquisition.
CentiMark's revenue timeline is a study in patient compounding: $98,500 in its first year, $1 million by 1974, $10 million by 1984, $100 million by 1994, $500 million by 2012. Tim Dunlap oversaw the growth from $247.5 million in 2002 to $800 million in 2020 — more than four times the revenue in 19 years, every dollar of it organic. Through the same period, PE-backed roll-ups were building commercial roofing platforms at scale: HCI Equity Partners establishing Highland Commercial Roofing, Great Range Capital, Six Pillars Partners, Aurora Capital.
CentiMark watched all of it. And changed nothing.
The strategic non-event — the liquidity path they chose not to take
The most important decision CentiMark made about capital markets was to make no decision at all, and to build a structure that meant they never had to.
In 1988, when CentiMark was well under $100 million in revenue, Ed Dunlap established an ESOP that gave employees a 30% ownership stake. That single structural move solved two problems at once. It gave employees a financial stake that aligns incentives in ways a paycheck alone doesn't. It gave the Dunlap family a partial liquidity mechanism that didn't require selling the company or taking on outside capital to fund a buyout.
Ed Dunlap watched closely as the "roll-ups" — his term for roofing companies that banded together to draw national business — floundered and came to an inevitable conclusion. His response was to grow organically, avoid public bidding, and build the national reach that made outside capital irrelevant. "Everything was grown in-house. The only thing we acquired was good people in those areas." No bolt-on acquisitions. No recapitalization to fund a growth sprint. No SPAC.
The ESOP is the structural substitute for a traditional exit here. Employees accumulate shares over time. The company funds the trust without external capital. The owner maintains control while creating a wealth-distribution mechanism that pays out continuously, rather than concentrating in a single transaction.
What worked — the four decisions that built a billion-dollar private company
Four choices compounded on each other over 54 years. None of them would have survived intact under a public-market shareholder base.
Decision 1: Zero debt as a strategic weapon
CentiMark holds a 5A1 Dun & Bradstreet rating — the highest possible — based on a net worth of over $50 million, making it one of the only commercial roofing contractors in the country to hold that designation. The company actively promotes its zero-debt balance sheet in recruiting and client proposals as a competitive signal.
During the 2008 recession, leveraged construction companies went under. CentiMark kept growing. During 2020, Tim Dunlap noted the pandemic "actually had a positive impact on our business." A public company in construction typically carries leverage to fund acquisitions and return capital. That leverage creates fragility. No debt means you can say yes when leveraged competitors are frozen, and you can survive downturns without a distressed sale.
Decision 2: The ESOP as a succession substitute
Established in 1988, the ESOP solved the alignment problem that normally forces a liquidity event. Employees own 30% of the business through the ESOP trust. The result: 53% of CentiMark's 3,500 associates average more than five years of tenure. That retention rate is not coincidental. It is the direct output of a workforce that is also an ownership base.
Most roofing owners encounter ESOPs as an exit vehicle. CentiMark used it as a retention and succession mechanism, decades before the owner needed to exit.
Decision 3: Organic growth as cultural consistency
"When you grow an organization organically there is common vision and common direction the whole way through. It's kind of a philosophy of a one-team goal." — John Godwin, SVP, at the $1 billion milestone.
From Pittsburgh to 100+ offices across North America, CentiMark opened each branch rather than buying one. Slower? Yes. But every office runs the same safety protocols, the same service standards, the same sales approach. Acquiring a roofing company means inheriting its culture. Growing organically means you build the culture once and replicate it intact.
Decision 4: The national accounts moat
CentiMark built the first national accounts program in the construction industry — a single point of contact for large corporate clients with facilities across multiple states. That program gave them a structural advantage that smaller regional operators couldn't replicate without scale they didn't have. Revenue tied to Fortune 500 facility maintenance budgets, spread across dozens of states, is insulated from local market downturns. That diversification compounds in value at every exit conversation.
What didn't — the real cost of staying private
Staying private is not without friction. Three things CentiMark had to solve the hard way.
Cost 1: Speed
Organic growth is slower than acquisitions. From $100 million in 1994 to $500 million in 2012 is 18 years. A PE-backed roll-up starting from the same position, with acquisition capital and platform multiples, could reach that revenue in five. CentiMark got there — but the deliberate choice to avoid external capital meant slower headline growth across multiple decades. That trade-off was made intentionally. It still had a cost.
Cost 2: Succession without market validation
When you're private, there's no stock price to anchor the company's value. Succession happens without the objective signal a public market provides. The Dunlap father-son transition (Ed to Tim, formally completed February 1, 2021, after 44 years working in close proximity) was navigated through relationships and preparation, not market mechanisms. Ed Dunlap died July 23, 2022, eight months into Tim's tenure as CEO. The company absorbed that transition without a public continuity signal. That works when the succession has been built over decades. It does not work if you try to engineer it in the three years before retirement.
Cost 3: The ESOP repurchase obligation grows with success
As CentiMark's value has increased, the ESOP trust's obligation to repurchase shares from retiring or departing associates has grown proportionally. A company doing $1 billion in revenue carries a meaningfully larger repurchase liability than the same structure at $100 million. This is the structural tension in any large ESOP: the more the company succeeds, the more expensive it is to buy out departing members. The reason it works at CentiMark is that the ESOP was established in 1988, when valuations were low and the obligation was small. Retrofitting an ESOP onto a mature, highly valued business changes the math substantially.
What roofing owners should steal from it
Five lessons from CentiMark that apply to any owner thinking about capital and liquidity.
Zero debt as a competitive weapon, not just conservatism
Companies with no leverage can move when competitors are frozen. Exit options narrow during downturns — the exact periods when buyers demand discounts. Meaningful debt constrains you at the worst possible moments.
Set up the ESOP earlier than you think you need to
CentiMark established theirs when the company was worth a fraction of its current value. The tax benefits and cultural impact of an ESOP are greatest during growth, not when the owner is years from the door. At $5M–$20M EBITDA, that conversation is worth having now.
Organic growth produces a better culture than acquisitions
Acquired companies come with acquired problems: billing habits, safety cultures, employment relationships you didn't choose. CentiMark's uniformity across 100+ offices and 3,500 associates exists because every office was built from scratch. That shows up in retention numbers, client renewal rates, and ultimately in acquisition multiples if you ever sell.
National accounts capability is a structural moat
Any roofing company can do quality work on a single building. Few can tell a Fortune 500 facilities director they'll manage every location in the country under one contract, one warranty, one contact. CentiMark invented that model. Most competitors haven't built it. That gap is worth more at exit than raw revenue growth.
Staying private is a legitimate exit strategy, not a failed one
The conventional story about roofing-company success ends with a sale. CentiMark became the first commercial roofing and flooring contractor in North America to cross $1 billion in sales through organic growth without ever taking outside equity. That is a compounding private entity distributing wealth continuously, not crystallizing it in a single transaction. Whether that's better than a PE exit depends entirely on what you want. But it's a real choice — and it's rarely presented honestly to roofing owners who get pitched on liquidity events.
A public company of comparable revenue would spend roughly $1.24 million annually on SOX compliance costs alone. That's before management time, audit committees, quarterly guidance pressure, and the shareholder relations machine. CentiMark carries none of that overhead. The consultants pitching PE or IPO are not wrong about the math of a single exit event. They're just not telling you what the company on the other end of that event has to look like, or what it costs to run.
Ed Dunlap built CentiMark in a basement in Pittsburgh with $1,000. He never took outside money. The only people he answered to were his family and his employees — who owned 30% of the outcome. That's a philosophy, held consistently for five decades.
The roll-ups he watched closely? They floundered.
Post 5 of 6 in The Roofing IPO Playbook series.