DIY Builds
DIY Builds
Photo: Farid Najafguliyev
How Long Does Concrete Take to Dry Before Rain? Even if it starts raining after a concrete pour, the potential for damage may not be that serious. If you had time to complete the finishing process and the concrete has stiffened (typically 4 to 8 hours after mixing), rainwater may cause little if any damage.
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Pouring Concrete in Rain Predicting the weather is tricky, but you can take steps to prevent rain from ruining your concrete project. By Anne Balogh Pouring concrete in the rain is not only miserable, but it can also lead to problems with the final surface strength. Photo by: ESTELLE R/Shutterstock. Water is a key component of all concrete, mixing with cement and causing it to hydrate and gain strength. But after freshly mixed concrete has been placed, water in the form of a driving rain can do much more harm than good. Pouring concrete in the rain can compromise its strength, increasing the tendency for dusting and scaling to develop. Once the damage is done, it can be hard to rectify and will often ruin the appearance of the finished surface. Don’t let it rain on your parade. Here are some tips for preventing and troubleshooting rain-damaged concrete. Despite modern weather forecasting technology and radar maps, an unexpected rain shower can develop without warning, especially during the wettest months of the year (see these guidelines for placing concrete by region and season). If rain is in the forecast, you should postpone a large concrete pour until conditions improve. Even if rain isn’t predicted, you should always be prepared to cover the concrete work with a tarp or plastic sheeting just in case. Make sure to seal the edges so rainwater can’t seep underneath. Also scope out the jobsite before the project begins, looking for the presence and location of gutters and downspouts. Rainwater gushing from downspouts or cascading over the edge of a roof without gutters will carve a trench into wet concrete if the slab is directly beneath the overflow. Heavy rain after a concrete pour can be concerning if the concrete hasn’t been finished and had enough time for the intial curing process. Photo by: Mr.Note19/Shutterstock
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Even if it starts raining after a concrete pour, the potential for damage may not be that serious. If you had time to complete the finishing process and the concrete has stiffened (typically 4 to 8 hours after mixing), rainwater may cause little if any damage. In fact, once concrete sets, water on the surface is actually beneficial because it aids in hydration and curing. A simple scratch test, using a screwdriver or Mohs concrete surface hardness scratch test kit, can be performed to assess the integrity of the surface and determine if the rain had any impact.
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