Heritage Concrete Service Corp
FinisherForecast
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ACI 305R · 306R · 308R · 305.1
Pour conditions · Updated every hour

Pour or Wait?
Know Before You Roll

Pour condition intelligence built for concrete finishers — not the general public. Rain risk, evaporation rate, safe pour windows, and crew decisions before the truck rolls.

Built by Heritage Concrete — Sanford, NC
ACI 305R · 306R · 308R certified checks
Free for contractors in NC
Get Your Job Site Pour Forecast — Free
Works for any US city, zip code, or address
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Safe Pour Window
Exact hours when conditions are safe — not just a Go/No-Go. Know your start time before the truck leaves the plant.
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Crack Risk, Not Just Weather
Evaporation rate, humidity, wind, and temp combined into one plastic shrinkage risk score with plain-English explanations.
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What to Add to the Mix
Specific admixture recommendations — retarder, accelerator, fiber — based on today's exact job site conditions.
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5-Day Pour Outlook
See which days are safe to schedule, which need extra crew, and which to reschedule — before the GC calls.
Pulling conditions for your job site...
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Viewing:
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Good pour conditions today
All ACI pour checks pass — concrete should behave normally.
Hourly pour risk
POUR OK
CAUTION
NO POUR
Pour outlook
Recommended admixtures
Finisher guidance — today
Why concrete cracks — in plain english
ACI standard checks
Concrete Volume Calculator
Calculate how many cubic yards you need for any job. Add multiple sections, set your waste factor, and get a ready-to-order quantity.
Pour shape
ft
ft
in
Common: 4" residential, 5–6" driveway, 6" commercial
Additional areas
Waste & overage factor
Always order more than you calculate. Running short mid-pour causes cold joints that weaken the slab. +5% is standard for simple rectangular pours, +10–15% for odd shapes or rough subgrade.
Volume required
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cubic yards
Cubic feet
—ft³
Sq footage
—ft²
80lb bags
—bags
60lb bags
—bags
Ordering tips
Enter your dimensions on the left to see how many cubic yards you need.
Always order more than your exact calculation — running short mid-pour causes cold joints.
Call your Heritage Concrete plant at least 24 hours in advance for large pours over 5 CY.
Confirm mix design (PSI), slump, and fiber requirements when you call in the order.
Live Radar
Real-time precipitation radar — updated every 10 minutes. Use the search below to jump to your job site location.
Search a job site first
Go to the Pour Forecast tab, search your job site location, and then come back here to see live radar for that area.
Radar key:
Light rain
Moderate rain
Heavy rain
Very heavy
Extreme
Updates every 10 min · Powered by RainViewer
Loading radar...
Concrete pour radar guide
Any green/blue on radar nearby — Do not start a pour. Rain could arrive before concrete sets.
Clear radar within 50 miles — Check the movement direction. If cells are moving toward you, give yourself a 2-hour buffer.
Completely clear radar — Safe window. Use the Pour Forecast tab to confirm the full 24-hour outlook before committing to the pour.
Evaporation Rate Calculator
ACI 305R — Plastic Shrinkage Cracking Risk · lb/ft²/hr
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ACI 305R Action Threshold: 0.20 lb/ft²/hr
When evaporation exceeds 0.20, take immediate precautions. Erect windbreaks, apply evaporation retarder, use fogging, or provide shade. Do not let the surface dry before finishing.
Air Temperature (°F)
20°F120°F
Concrete Temperature (°F)
40°F130°F
Relative Humidity (%)
0%100%
Wind Speed (mph)
0 mph60 mph
Evaporation Rate
0.00 lb/ft²/hr
0.000.100.20 ⚠0.300.40+
LOW RISK
No precautions needed
ACI 305R Risk Zones
Rate (lb/ft²/hr) Risk Action
< 0.10 LOW No special precautions required.
0.10 – 0.19 MODERATE Consider evaporation retarder. Have fogging ready. Monitor surface.
0.20 – 0.29 HIGH Apply evap retarder. Erect windbreaks. Active fogging required.
≥ 0.30 EXTREME Consider delaying the pour. All protective measures simultaneously.
Calculation method
Based on the ACI 305R nomograph empirical formula: E = 5(Tc2.5 − r · Ta2.5)(1 + 0.4 V) × 10−6 Tc = concrete surface temp (°F)  ·  Ta = air temp (°F)  ·  r = relative humidity (decimal)  ·  V = wind speed (mph)