Groundwater should also be checked before construction.In such cases, the concrete will absorb water from above and take runoff from areas around it These could become more problematic if the grade of the ground around the slab slope towards the water source. You should also watch out for sprinkler systems. Natural occurrences like rain and snow could pose a risk.Spots of water leakage, which may be as a result of unprofessional installation of the plumbing system.Here are some of the most common sources of moisture in concrete floors. Sources of Moisture in Concrete in a Work Site This will measure the presence and quantity of moisture throughout the depth of the slab. This is done using special moisture probes embedded in the concrete substrate. Relative Humidity Testing (ASTM F2170) is a more accurate testing method. Keep in mind that this test type is not testing the moisture condition that matters over the long haul. However, this test only measures the moisture in the top 1/2 inch of the concrete slab and is prone to inaccuracy due to ambient conditions. The rate of evaporation is calculated based on the weight differential. To perform this test, the calcium chloride is placed in a sealed dish where it will absorb the moisture evaporating from the slab. The calcium chloride test uses the weight differential of calcium chloride salt placed on the surface of the slab for over 72-hours to determine if there is a moisture problem. This is also known as the moisture vapor emission rate (MVER) test and takes just about 72 hours to produce results. If you notice condensed moisture accumulation under the plastic after then, it indicates a problem.Īnother test to try out for quicker results is the Calcium Chloride Test (ASTM F 1869). To perform this, you’ll need to duct tape an 18-inch square piece of plastic onto the exposed side of the concrete and leave it on for sixteen (16) hours. Tests to Check for Moisture in Concrete SlabsĬonsidered one of the simplest test methods for determining whether there may be moisture in concrete, the ASTM D 4263 Concrete Moisture Test could provide you some information to work with. Cracking, lifting, bubbling, or peeling of the floor surface.Signs of delamination on flooring that uses adhesive and/or grout during installation.Damp spots on the floor or areas of darker discoloration.Condensed moisture vapor can deposit alkali/salt, which looks like white residue, on the floor.But if you're not yet sure, there are some signs to look out for. You should be able to notice that there is moisture on the concrete floor right away. This is known as moisture vapor transmission and can lead to problems associated with moisture on concrete floors. While you won't have to worry about the moisture near the surface as it will evaporate, moisture from below or within the concrete will tend to migrate up and through the concrete, escaping through the path of least resistance. From the concrete mix itself to the soil under the slab, there are several areas that could be at fault when you notice this problem.Ĭoncrete is naturally porous. Moisture issues on concrete floors could be due to many reasons. If left unchecked, it could lead to problems like rotting hardwood, damping carpet, and coating delamination. Concrete floor moisture can be a cause for concern regardless of the location it shows up in an apartment or building.
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