Dew point chart6/19/2023 ![]() The relative humidity and temperature need to be taken in the environment you are coating. However, the temperature and relative humidity outside is not always the same as inside. If the floor is outside, or in an outside garage, or in new construction with no influence of HVAC, this statement is true. “The weather man says the dew point is 40 degrees today and my slab is 50 degrees, so I’m good to coat.” In some cases, this is correct. For example, in 100% RH, if you put a wet rag outside, even if the temperature is 85 degrees, it will never dry because the air is already completely saturated with moisture and the moisture from the rag has nowhere to go. This is because when the relative humidity is at 100%, moisture can no longer evaporate into the air because it is completely saturated. Also, it is worth noting for complete understanding that at 100% humidity, the dew point is equal to the air temperature. The concrete slab can contain condensed moisture on the surface, causing adhesion, cure, and film issues. This is why most technical data sheets will say not to coat a floor within 5 degrees of the dew point. This means that if your floor temperature is 45 degrees or lower, coating the floor is a risk. ![]() Below is a table showing the relationship between temperature, humidity and dew point.Īs you can see, if the air temperature is 75 degrees and the relative humidity of the room is 35%, the dew point would be 45 degrees. If the slab of concrete is at a temperature that is lower than the dew point of the room, condensation will form on the concrete, creating all sorts of issues with your coating such as compromised bond and possible finish issues such as fisheyes and color inconsistencies. ![]() The same goes for a floor during a coatings job. This is because the glass has a temperature below the dew point in the room. When you put a cold glass in a humid room, condensation forms on the glass. NICHE SYSTEMS – Custom Polymer Flooring Solutionsĭew point is defined as the atmospheric temperature below which water droplets begin to condense and dew can form.Glass Flake-Reinforced Lining Systems for Steel Tanks.Fiberglass-Reinforced Vinyl Ester Lining Systems.Mica Flake-Reinforced Vinyl Ester Coating & Lining Systems.PROLINE SYSTEMS – Linings & Containment Solutions.PROTECT SYSTEMS – High Performance Polymer Flooring.
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