July through September is when Florida paving superintendents make weather-based go/no-go calls every single morning. Push when conditions allow – and you stay on schedule. Push when conditions don’t allow – and you place pavement that fails verification testing, gets cored out and rebuilt at your cost, and adds weeks to the schedule anyway.
Here’s the field-test criteria experienced Florida paving superintendents use to make the call.
The hard rules (these never bend)
Standing water on the surface. Do not pave. Period. Water in the mix and underneath the new asphalt destroys the bond and creates premature stripping. No experienced crew lift over wet pavement.
Surface temperature below specification. FDOT Section 330 requires minimum surface temperatures depending on lift thickness and mix type. SP-12.5 surface course requires surface temps above 50°F for thin lifts. In Florida that’s almost never an issue mid-summer, but watch dawn morning starts in November-February.
Active rain during placement. Stop the paver. Stop deliveries. The mix loses temperature and gets contaminated. Restart only after surface dries.
The judgment calls
These are where superintendents earn their pay:
Recent rain, now dry. Surface looks dry, but how recently did it rain? If the rain ended within the past 4 hours and the air is humid, the base may still hold moisture even though the surface looks OK. Test with a hand-feel: lay your palm on the pavement for 30 seconds. If your hand comes up damp, it’s too wet to pave on.
Forecast rain mid-shift. You can start a shift with rain forecast for 3pm. The question is what you’ll do at 2:30 when the radar shows the cell approaching. Plan the pull-back: which trucks already loaded need to be redirected, which areas of the spread need to be sealed before the rain hits.
High humidity, no rain expected. Florida summer days routinely hit 85% relative humidity with no rain in forecast. This is fine for paving – humidity in the air doesn’t affect mix bonding. But it does slow mix cooling, which can affect compaction window. Compaction crews need to stay closer to the paver.
Equipment and crew adjustments for wet-weather risk
When you’re operating in the July-September window, a few practical adjustments:
- Tarps on every truck. Loaded trucks waiting at the project site need to be tarped against sudden showers. Cold-stiff mix from a wet load is rejected at the paver.
- Pop-up shelters for compaction crews. Brief showers may pause the paver but not the rollers – rollers can finish compaction of placed material before rain hits.
- Pre-staged emergency tarps. Heavy-duty tarps positioned to cover placed material in case of sudden cell.
- Radar app on every supervisor’s phone. RadarScope, Weatherbug, or similar – checked every 30 minutes during shift in active weather.
When to pause for a day, not just an hour
If by 9am the day looks like:
- 60%+ chance of rain through afternoon
- Multiple cells already on radar approaching from the Gulf
- Field surface damp from overnight thunderstorm
… the right call is to cancel the shift and not place mix. Restock the plant queue with the next day’s loads. Send the crew home. The cost of one canceled shift is far less than the cost of placing 1,500 tons that fail density and have to be milled out.
For owner contracts with rain-day clauses, document everything – radar screenshots, supervisor logs, time of cancellation. The documentation matters when the owner asks why the day was canceled.
How VLJ schedules around wet weather
We forecast crew and truck assignments 48-72 hours out and review the call daily through the wet season. On projects we run for primes, we share our morning weather assessment with the prime’s superintendent by 6am – go, pause-pending-recheck, or full-day cancel. Predictable communication beats heroic execution every time during Florida’s rainy season.
If you’ve got a Florida paving project running July-September and want a sub who’ll communicate the weather call clearly, reach out.
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Related Resources
- Our Services
- Weather and the Worksite – Planning for the Unpredictable
- What Happens When Innovation Meets the Work Zone
Running a Florida paving project this summer? Talk to VLJ Construction Services.
