Working in the Heat: Surviving Summer Site Work

UK heatwaves are no joke on site, especially not with parts of England approaching 40 degrees celsius this summer. Hot weather brings a few challenges for trades and construction workers, so if you’re working in the heat outside, here’s a few things you & your crew should keep in mind when the sun’s beating down.

Materials Curing Fast? You’re Not Imagining It

Hot weather speeds up concrete curing, reducing strength and causing cracks. This means don’t skip planning mix times, and avoid pouring in peak afternoon heat if you can, as early setting means less workability time.

Screeds also dry unevenly in heat and it shows! Cracks, curling, and weak spots can show up if not managed properly, so it’s a good idea to keep surfaces shaded or misted if possible and use retarders or additives if working in hotter conditions is unavoidable. Generally, the best temperature range for screeds drying tends to be between 10°C and 20°C – so if the temperature is really spiking it might be best to reschedule that pour.

Piping Hot – Drainage Work in the Heat

Drainage pipes and heat don’t really mix either, as PVC pipes expand in high temperatures and joints can loosen or warp. That “perfect fit” at 8am might already leak by 3pm, so make sure to leave expansion gaps and check alignment after laying, especially on long runs or sunny trench lines.

And speaking of trenches, those also dry out fast and shift when the weather heats up. It’s no fun if a sunbaked trench cracks or collapses without warning when dry ground becomes brittle, so you shouldn’t assume yesterday’s trench is still fine. It’s better to play it safe and re-check trench walls daily, and also use proper shoring or shielding, even on “shallow” digs.

Keeping Cool

Heat also affects your energy, focus, safety, and your body. And you sweat more than you think! Even on cooler summer days, manual work causes serious fluid loss.  And no, the occasional cuppa doesn’t cut it – you need actual water.

Dehydration leads to muscle cramps, headaches, fatigue and poor focus, so it’s wise to keep a water bottle on hand and sip often. And keep an eye out for dizziness, headaches, confusion and dry mouth. These are early warning signs for heat exhaustion and if you leave it for too long, it will get serious. So know the signs, sit down, cool off, drink water, and get help if it doesn’t pass quickly.

When your body overheats, everything suffers from decision-making to grip strength and stamina. You’ll also get clumsier and more likely to mess up, which can get dangerous especially if you’re operating machinery. So remember to take plenty of short breaks in shade, rotate the tough jobs, and rest before you feel dizzy, not after.

Sunburn Slows You Down

Yep, sunscreen feels greasy, then ends up on your gloves. But UV burns are no joke, and not just for natural gingers!

UV radiation also reflects off the ground, surfaces, tools, even water puddles. You can even sunburn under scaffolding if you’re not careful, so slather that high SPF sunscreen on exposed skin, reapply every few hours, and don’t skip your neck or ears!

Shade up where possible and wear a brimmed hat if you can, not just a cap. Polarised sunglasses will help reduce glare and protect your eyes.

Don’t Ignore the Gear

Hard hats can feel suffocating in summer, but if your job requires them, then ditching them is risky. Sunstroke and falling objects are both very real threats, but the good news is vented helmets or sweatbands make a big difference during long stints outside.

Similarly, some hi-vis gear does feel like wearing a plastic bag in summer, especially with sticky, humid UK heat. That doesn’t mean skipping it – just pick smarter. Lightweight, breathable PPE is worth the investment. So are wraparound shades, a decent sun hat, and summer-friendly gloves that grip well in heat.

Early Starts Beat Midday Heat

Check weather forecasts before pouring or laying, and if you can shift your hours to avoid peak heat, do it. The sun’s usually strongest between 11am and 3pm and that’s when most issues hit, so if possible try to get the heavy work done early, and save finishing and lighter tasks for later in the day if you can.

And Finally – Look Out for the Team

It’s easy to miss the signs of heat stress in yourself. Sometimes your mate will spot it first. We know no one wants to be the one who keels over mid-shift, but ignoring the signs doesn’t make you stronger – it makes you vulnerable. So keep an eye on each other and if someone’s acting off or not themselves, speak up and check in.

Plan ahead, stay hydrated, and look out for your mates.

Got tips for working in the heat? Share them with us – we’d love to hear what works for you!

Frequently Asked Questions