Mixing in the Winter. What You Need to Know
When the temperature drops and the rain sets in, every builder faces the same question: should you still mix?
Winter brings its own set of challenges, from slower curing times to damaged tools and knowing when (and how) to mix safely can save you time, money, and a lot of frustration.
Can You Mix in Wet Weather?
You can but you shouldn’t always. Light rain or damp conditions aren’t usually a problem, but heavy rain or freezing temperatures can completely ruin your mix. Too much water dilutes the cement paste, reducing strength and durability once it cures. When the temperature drops below five degrees, the chemical reaction that hardens the mix slows dramatically or even stops altogether. And if water in the mix freezes before it sets, it expands and creates internal cracks. Once that happens, the integrity of your concrete or mortar is compromised from day one.
How Wet Weather Damages Your Mixer
Your mix isn’t the only thing that suffers in winter weather. Prolonged exposure to rain and frost can cause lasting damage to your mixer too. Damp conditions can lead to moisture seeping into the motor housing, causing corrosion or short circuits that eventually lead to power failure. Metal components, especially around the drum and bearings, are also at higher risk of rusting if left wet. And when you’re mixing in the rain, mud, grit, and slurry often stick to the inside of the drum, making it harder to clean and increasing long-term wear.
Tips for Safer Winter Mixing
If you have to mix in cold or wet conditions, there are a few simple steps that make a big difference. Set up a shelter such as a gazebo, tarp, or scaffold sheet to keep the rain off your mixer and materials. Use slightly warm water to help maintain the chemical reaction and stop freezing in the early stages. Keep sand and cement dry by storing them off the ground and covered, as damp sand can throw your mix ratio off completely. Always clean and dry your mixer after every use to prevent rust and buildup, and check your power leads to make sure they’re outdoor-rated and kept raised off wet ground.
When to Avoid Mixing Altogether
There are times when it’s better to wait. Avoid mixing if temperatures are below two or three degrees, if heavy rain or frost is forecast within 24 hours, or if your materials are already damp or frozen. Waiting for better conditions can save you a wasted batch and a lot of rework.
Final Word
Winter work doesn’t have to stop but it does demand extra care. Protect your materials, keep your mixer clean and dry, and know when to call it a day. A little patience (and the right kit) goes a long way toward getting the job done safely and properly.
Built by builders, for builders. CemixFlo makes every mix faster, cleaner, and easier whatever the weather.