If your Creve Coeur driveway is due for sealcoat and your roof is due for replacement, the two jobs compete for the same weeks and the same stretch of pavement. The order matters. Seal the driveway after the roofing crew has finished, not before, and plan the sealcoat around the weather that St. Louis gives you in the shoulder seasons. This page walks through why the order matters, what the roof crew leaves on the concrete or asphalt, and what to confirm in writing before anyone rolls a squeegee across the drive.
Why the roof goes first
A roof replacement puts a lot of traffic on the drive. Dumpsters, shingle bundles, the tear-off crew's trucks and the material hauler all come in over the same pavement, and some of them park with loaded wheels for hours at a time. Fresh sealcoat is soft while it cures. A dumpster set on a new coat can leave marks that will not go away, and a tire turning on fresh sealer can scuff it before it hardens. Sealcoat applied before the roof job is usually wasted on the parts the trucks drive over, and it may need to be repaired afterward anyway.
Nails are the other reason. A tear-off drops nails, granule-filled shingle debris, and sometimes small pieces of flashing into the drive and the lawn. Those pieces get rolled into fresh sealer or pressed into the surface while it is still tacky. Sweeping and a magnetic pass after the roof is done are part of the job, and the sealcoat should be the last thing applied to the pavement.
The St. Louis weather window
Sealcoat needs dry weather for the application and enough warm days after it for the product to cure. Most sealers list a minimum air and surface temperature on the label, and they also list a rain window in which the surface must stay dry. In the Creve Coeur area, late spring and early fall usually give the best chance of both. Late October and November often bring cold nights, and once the temperature drops below the label minimum, the sealer may not set the way it should. A sealcoat that goes down on a cold surface can look fine on the first day and then show dull patches or poor adhesion the following spring.
The freeze and thaw cycle is a second concern. Sealer applied in the fall has to survive a winter of salt, snowmelt and repeated freezing before it has fully hardened. If the surface has cracks that were not filled, water gets in during thaw and the cracks widen. Filling cracks before sealing is standard, but the crack filler also has a temperature and cure window, so the crew should be scheduling both steps against the forecast.
What the sequence looks like
- The roof crew finishes the tear-off, the new roof, the cleanup and the magnetic sweep of the lawn and drive.
- The homeowner or a second crew walks the drive and marks any cracks, oil spots, or low areas that held water before the job.
- Cracks are cleaned and filled, and the filler is allowed to cure to the product's instructions.
- The surface is cleaned, dried, and checked for temperature and rain before the sealer goes on.
- The sealer is applied, and the drive is kept clear of vehicles and deliveries for the cure time on the label.
Each step waits on the one before it. If the roof crew is still hauling bundles on the 10th, the sealer should not be on the calendar for the 9th.
What to confirm in writing
Ask whether the sealcoat is in the same contract as the roof or in a separate agreement, because that decides who answers for the surface if a dumpster mark shows up on the sealer. Ask who will perform the sweep and magnetic pass before the sealcoat is applied, and whether that pass is in the roofing scope or the paving scope. Ask for the sealer product name and the label minimums, since those set the earliest date the crew can work. Keys documents the job with a written scope, photos and measurements that you keep, and that scope should say where the dumpster and bundle staging are, so you can point to the exact areas that need protection before the sealer goes down.
If the roof is being done by one company and the driveway by another, ask both companies who will repair marks from the other's work. A written note saying which crew owns the pavement during the roof job prevents a dispute over a tire mark that could have come from either side.
Dumpster and bundle placement
Many Creve Coeur lots have a driveway that is the only hard surface a dumpster can sit on without damaging a lawn. The dumpster base can crack a sealed drive when it is loaded, and the sealer can lift at the corners where the bin rests. Ask where the bin will sit and whether a protective mat or plywood base will go under it. The same goes for pallets of shingles. A pallet on fresh sealer can leave an imprint that looks like a stain for years.
If the driveway was sealed in the spring and the roof was not finished until the fall, the older sealer is usually a sounder surface for the crew than a fresh coat. Asking for the date of the last sealcoat helps you decide whether the surface can take the traffic of a roof job without extra protection.
When the driveway can wait
Not every driveway needs sealing right after the roof. If the surface is in good shape, the crew's traffic is limited, and the weather window closes before the roof is done, it is reasonable to postpone the sealcoat to the next spring. A seal applied too late in the year is often worse than one applied in the following warm season. The point is not to seal at any cost but to seal when the surface is clean, dry, warm enough for the product, and not about to be driven on by a truck carrying a dumpster.