PourDay uses the ACI 305R evaporation formula and real-time weather data to calculate your concrete evaporation rate and tell you whether conditions are safe to pour — before your ready-mix crew ever leaves the yard.
You check the weather, make a gut call, and hope for the best. But weather apps weren't built for concrete.
High evaporation conditions accelerate moisture loss, making finishing nearly impossible and compromising the surface before your crew can work it.
When surface moisture evaporates faster than bleed water replaces it, cracks form within hours. Callbacks, repairs, and lost trust follow.
Canceling a pour last minute means idle crews, wasted ready-mix, and schedule chaos. Proactive decisions save thousands per job.
PourDay replaces gut calls with data-driven decisions in seconds.
Launch PourDay on your phone or any device. Input your location and get current weather conditions for your job site.
Using the evaporation rate calculation based on ACI 305R and live weather data — temperature, humidity, wind speed, and concrete temperature — PourDay computes your real-time evaporation rate.
Capture weather, evaporation rate, mix design, and supplier info automatically. Build a complete record your crew and project managers can rely on.
Schedule around or plan for high evaporation based on our 16-day forecast and hourly projections. Stay proactive, not reactive.
Every feature exists because a concrete contractor asked for it.
Real-time evaporation rate computed from current weather conditions, updated continuously throughout the day.
Plan pours up to 16 days out. See projected evaporation rates and status indicators for every day in the forecast window.
Log every pour with conditions, mix design, and outcome. Generate PDF reports for QA documentation and project records.
PourDay works for any job site in the US. Enter your zip code and get hyper-local conditions for your exact location.
No subscription, no paywall, no premium tier. PourDay is built for the concrete industry and free to use.
“Especially with the changes in cement in the last 2 years, if you are not tracking and scheduling around evaporation for slab pours you are putting yourself at risk.”
From ticket to finish, PourDay captures the data that protects your work and keeps your crew accountable.
Record mix details, concrete supplier, and ticket numbers for every load that hits your site.
Automatically capture weather, evaporation rate, and GO/NO GO status at the time of each pour.
When a crack shows up six months later, your pour log proves the conditions were right.
Export pour logs and mix records for project managers, inspectors, and engineers.
ACI 305R recommends taking precautions when the concrete evaporation rate exceeds 0.15 lb/ft²/hr. Above this threshold, surface moisture evaporates faster than bleed water can replace it, causing plastic shrinkage cracking — especially critical with blended cements like Type 1L. PourDay calculates this automatically using live weather data for your job site.
Safe pour conditions depend on four variables: air temperature, relative humidity, wind speed at 18 inches above the slab, and concrete temperature. PourDay plugs your real-time job site weather into the ACI 305R evaporation formula and gives you a GO, CAUTION, or NO GO in seconds — no math, no nomograph.
Plastic shrinkage cracking is caused by high evaporation conditions pulling moisture from fresh concrete before bleed water can replace it. When rates exceed 0.15 lb/ft²/hr, use evaporation retarders, erect wind breaks, adjust pour timing, or lower concrete temperature. PourDay shows you the real-time evaporation rate for your exact job site before every pour.
Evaporation rate measures how fast moisture leaves the surface of fresh concrete. ACI 305R recommends precautions above 0.15 lb/ft²/hr to prevent plastic shrinkage cracking — especially critical with blended cements like Type 1L.
We use Open-Meteo, a professional-grade weather API. 0–3 days is highly reliable. 4–16 days is directional planning guidance.
PourDay works anywhere in the US. Enter your job site zip code and get real-time conditions for your exact location.
Yes. PourDay lets you log every mix design, supplier, and pour — automatically capturing weather conditions and evaporation data at the time of placement. Build a complete history across all your jobs.
Yes. PourDay is completely free for contractors. No subscription, no in-app purchases, no premium tier. We built it to help the industry make better pour decisions.
Real-time evaporation data. Mix and pour logging. Built for concrete crews.