Ask a roofing contractor what went wrong at their last audit and the answer is almost always the same: subcontractors they could not produce certificates for. The mechanic is simple and unforgiving. Where you cannot prove a sub carried their own coverage, your carrier treats that sub's cost as your payroll and charges you for it at your rate. The certificate of insurance is the piece of paper that stops that happening, and most of the ones sitting in contractor filing cabinets do not do the job they were collected for.
1. What a Certificate Is, and What It Is Not
A certificate of insurance is a summary. It says that on the day it was issued, a policy existed, with those limits, for that named insured, on those dates. It is issued by an agent for information only, it confers no rights, and it does not amend the underlying policy. Every certificate says so in the notice block, and contractors read past it every day.
That means a certificate proves less than people assume, and exactly one thing well: that a policy existed on the issue date. It does not prove the policy is still in force this morning, that it covers roofing work, that it has not been exhausted, or that you are protected by it. Each of those needs something more than the certificate itself.
This is not an argument for ignoring certificates. It is an argument for reading the four things on them that decide whether your audit goes well.
2. Check One: Is the Named Insured the Entity You Actually Hired
The name on the certificate must match the name on the contract and the name on the cheque. A certificate for a limited liability company whose owner you hired personally, or for a trading name that does not match the entity you paid, is the kind of mismatch that gets a certificate thrown out of an audit file six months later.
This sounds pedantic until you watch it happen. Crews change names, subs form new entities, a brother-in-law's company issues the paperwork while a different company does the work. At audit the question is narrow: does the documentation match the payment record? Where it does not, you get charged.
Fix it at the point of hire. The entity you contract with, the entity on the certificate, and the entity you pay should be one entity, and if the sub cannot make those three line up, that is information about the sub.
3. Check Two: Does It Show General Liability AND Workers' Compensation
These are two different problems and one certificate. General liability protects against third-party damage the sub causes; workers' compensation covers the sub's own injured employees. A sub who has one and not the other has left you exposed on the side they are missing, and audits pick up both.
The workers' comp side is where the money is. If a sub's employee is hurt on your job and the sub has no workers' comp, the claim tends to find its way to your policy — and your experience modification factor carries the consequence for three years, long after the job is finished and forgotten.
Independent one-person subs are the recurring argument. Many states allow a sole proprietor to exclude themselves from workers' comp, and many roofing subs do. That exclusion is legitimate, and it is also precisely the situation where your carrier is most likely to treat the person as your employee for rating purposes. Ask what your carrier does with excluded sole proprietors before you build a crew out of them, not after.
4. Check Three: Are You an Additional Insured, and Does the Policy Actually Say So
A tick in the additional insured column of a certificate is a claim about the underlying policy. What makes you an additional insured is an endorsement on the sub's policy, not the certificate. Where the exposure is significant, ask for a copy of the endorsement itself, and read whether it covers ongoing operations, completed operations, or both.
Completed operations is the one roofers get wrong. A roof leak alleged two years after the job is a completed-operations claim, and additional insured status for ongoing operations only will not respond to it. Roofing generates its worst claims long after the crew has left, which makes completed-operations status the part that matters most for your trade.
Waiver of subrogation is the companion item. Without it, the sub's carrier can pay a claim and then come after you to recover. It is a routine endorsement and it is routine to forget to ask for it.
5. Check Four: Are the Dates Still Live, and Who Is Watching Them
A certificate dated in March proves nothing about a job in September. Policies lapse, get cancelled for non-payment, and get non-renewed, and none of those events sends you a letter. The certificate you collected in good faith at the start of the season can be describing a policy that no longer exists.
The practical answer is unglamorous: a tracking sheet with sub name, policy number, expiry date and a reminder ahead of it, and a rule that expired means no work until renewed. Contractors who do this consistently are the ones whose audits are boring.
The bigger discipline is timing. A certificate collected before the sub starts work is protection. A certificate collected after a claim is paperwork. It is the same document; only the sequence differs, and the sequence is the whole point.
6. What Good Looks Like on a Real Job
A crew lead calls on Tuesday: the tear-off crew is short two people and a sub can start Thursday. The version that survives an audit looks like this. Before Thursday you have the sub's certificate in hand, issued to your exact legal entity, showing general liability and workers' compensation with live dates, with you listed as additional insured for ongoing and completed operations and a waiver of subrogation in your favour. The expiry date goes in the same calendar you use for renewals.
The version that produces an audit bill looks almost identical from the outside. The sub works Thursday, the roof goes on, the customer is happy, and the certificate arrives the following month, or never, because by then nobody is chasing it. The work was identical. The exposure was not.
Contractors who get this right usually have one habit in common: the certificate request goes out with the subcontract agreement, not separately, and the office does not schedule a sub whose folder is incomplete. It moves the check from a memory task to a process one, which is the only version that holds up across a busy season.
It is also worth keeping the certificates for as long as your state's statute of repose runs on completed work, not just for the current policy year. Completed-operations claims arrive years later, and the certificate that proves your sub was insured on the day of the job is the document that keeps that claim off your loss run.
7. What This Costs You If You Skip It
At audit, uninsured subcontractor cost is generally added to your rating basis and charged at your class rate. Where your general liability rates on sales and your workers' comp rates on payroll, uncertificated sub payments can hit both. That is why a season of casual paperwork produces an audit bill rather than an audit refund.
The claims side is worse and less predictable. An injured worker with no workers' comp behind them looks for the party that does have coverage, and a completed-operations claim on a roof your sub installed will look for your policy if the sub's cover cannot be established. Neither of those is a paperwork problem at the point it lands; both were paperwork problems six months earlier.
Nothing on this list requires software or a compliance department. It requires the certificate before the ladder goes up, four things read on it, and a date in a diary.
This article is general information for roofing contractors, not legal or coverage advice. Policy wording, statutes and rating rules vary by carrier and by state — read your own forms and talk through your programme with a broker who writes roofing. Get a quote.