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Daily Quiz (29)


True or false: Marmorino, a veneer decorative plaster, is not recommended for humid environments such as bathrooms.


According to many coating manufacturers, what is the recommended upper limit of moisture content in a wood substrate before it can be painted?


True or false: Wet adhesion is the ability of a dry coating to adhere to a substrate under wet conditions such as immersion or high humidity.


True or false: A D+D In Depth article argues that the risks of moisture-related, single-wythe CMU wall problems based on the initial selection of the coating and number of repaints cannot be predicted.


True or false: Though the standard ASTM F2170 requires 72 hours to achieve results, one-day results of relative humidity testing of concrete floors with in-situ probes is typically accurate enough to judge if it is acceptable to apply materials that can tolerate higher moisture content.


What organization offers a certification in moisture testing of concrete slabs?


What inspection instrument uses a wet bulb and a dry bulb?


True or false: Relative humidity sensors used to determine moisture content of concrete slabs can produce fairly accurate results within an hour after probes are inserted into a slab, according to a manufacturer of the test equipment.


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered to be the upper limit for successful painting?


How can a hygro thermometer be useful in coating work?


What is another name for wet storage stain?


True or False: The plastic sheet method is a quantitative test for determining the extent of moisture in a concrete slab.


True or False: Relative humidity at the surface of bridge steel may be different from the relative humidity in the atmosphere away from the steel surface.


What does the anhydrous calcium chloride test measure?


True or False? Many coating manufacturers recommend a maximum relative humidity of 40% within a concrete slab before their flooring products are applied.


True or False? Before electronic instruments became available to measure dew point and relative humidity directly, surface temperature thermometers were used to derive these readings.


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered the upper limit for successful painting?


True or False: Air leakage into a building can generate much more moisture than moisture vapor transmission can.


True or false: To hold the blast (prevent re-rusting of blasted steel) inside a tank, one effective measure is to use dehumidification to keep relative humidity below 50%.


True or false: There are no quantitative methods for determining levels of moisture in concrete floor slabs.


True or false: The anhydrous calcium chloride test for measuring moisture in concrete slabs is a qualitative rather than a quantitative test.


True or false: The density of concrete prevents water vapor and gases from moving freely within the matrix.


Instruments used to test moisture in concrete or masonry walls are based on what principle?


True or false: The most accurate meters for detecting moisture within a concrete substrate are based on readings of temperature and humidity.


Why would a test for moisture content of concrete be important prior to application of thick-film elastomeric coatings?


Dried salt deposits on a brick exterior (see photo), resulting from moisture leakage through a wall, are called what?


When assessing the moisture content of wood with a suitable moisture meter, what level of moisture is generally considered the upper limit for successful painting?


True or false: Both relative humidity and temperature differentials from one side to the other can drive moisture vapor through a block wall.


True or false: A moisture content of 30%, as measured by a moisture meter, is generally considered the upper limit for successful painting of wood.


 
 
   

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