Exampleĥ0% solids by volume = 16 (wet mils) x 0.5 (50% solids by volume) = 8 dry mils. Solids by weight should not be used in this formula. To determine dry mils (or how much is left when the solvents are gone), multiply 16 (wet mils) times the solids content (by volume) of the particular liquid. Another way to state this is that one gallon of any liquid, applied over a 100 square foot surface, will be 16 mils thick when wet. Calculating Theoretical CoverageĪny liquid, when applied at a thickness of one mil (1/1000 inch) will cover 1604 square feet per gallon. Use a percentage factor of between 3% to 10%, depending on the contractor’s experience and efficiency. Miscellaneous LossĪ miscellaneous factor must be added to the theoretical coverage rate to cover losses due to material left in containers, equipment problems, etc. Consider using wind screens and add wind loss to your coating calculations. Wind Lossĭuring spray applications, up to 30% of the coating may be lost due to wind. Items to consider are: Shot-blasted ConcreteĮven though the surface texture appears to be fairly smooth, this surface may require 5%–15% additional material than the theoretical amount. Therefore, it is very important that additional material be added to the theoretical quantities to ensure that the proper coating thickness is applied. When coatings are applied over concrete, many factors such as the surface texture, overspray loss, container residue, equipment characteristics, and applicator technique will directly affect the amount of coating material required to meet the designed in-place dry film thickness (DFT). Therefore, published coverage rates should only be used as a guide for estimating material requirements for a given job.Īctual coverage will be less than theoretical coverage. Manufacturers publish theoretical coverages instead of actual coverages because they cannot anticipate job or surface conditions. Theoretical coverages are those calculated for glass-smooth surfaces with no allowances made for loss. Waterproofing and Traffic Application Table.
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