Low temperatures slow the chemical reaction that hardens concrete, which prolongs both finishing times and strength gain. Rain adds surface water that can mark the finish and dilute the paste if the area isn’t protected.

• Finishing: Cool weather keeps the surface workable for longer, but you’ll need patience before final trowelling. Never finish while water is on the surface.
• Strength: Expect slower early strength, so allow extra curing time before foot traffic and significantly more before vehicles or fixings.
• Surface quality: Unprotected rain can cause discolouration and weak edges. Have your covers ready before you start.

Plan around shorter days

We recommend booking a morning delivery. It gives you the longest window to place, strike off and set up curing protection before it begins getting darker and colder. Plus, you’ll still have some daylight to inspect the surface and secure everything properly.

With volumetric on-site mixing, Erris Concrete pours to suit how fast you can finish, and you can pause between sections if a rain comes along and hinders the pouring. Use our online concrete calculator to estimate your area’s volume, then request a quote.

Control slump without watering it up

More water raises the water-cement ratio, which typically means lower strength, more shrinkage and a greater risk of cracking and dusting. With volumetric batching, together we agree on the slump before mixing starts. If conditions change, it can be adjusted at the truck by dosing admixture or tuning the mix, so the water-cement ratio stays under control.

Materials are also kept separate until the moment they’re batched, so there isn’t any need to be racing the time to pour before the mix dries. Workability is maintained as you go.

Rain-ready placement and protection

Light showers can often be managed. Heavy, prolonged rain usually means you should postpone. If you do go ahead:

• Prepare falls so water sheds off the slab rather than pooling.
• Keep sheeting to hand and cover as soon as finishing is complete, remember to weigh the edges down to protect against wind.
• Protect slab edges and fresh arrises, which are the most vulnerable to washout.

Cold-weather curing

Cold, damp air slows strength gain, so build protection into your plan:

• Insulate: Use curing blankets or insulated sheets, especially overnight.
• Retain moisture: Plastic sheeting keeps humidity in for proper hydration.
• Allow extra time: Thin paths may be walkable in 24 to 48 hours, but heavy loads need far longer. Full strength commonly develops over 28 days, and cold stretches that further. Always check the surface and edges before loading steps or vehicles.

Ready to pour?

If conditions look unpredictable, talk to us about pacing your pour and adjusting the slump on site, so you can finish neatly and protect the area the same day. Use our calculator to estimate your volume, then get in touch to secure your delivery time.