Laserfiche WebLink
<br />Materials Test Results <br /> <br />28. A thorough search was made for coatings which manufacturers claimed <br /> <br /> <br />could be used to seal a wall against a head of water. <br /> <br /> <br />Clear coatings <br /> <br /> <br />29. It was desirable to find a clear coating which would make a wall <br /> <br /> <br />resistant to water penetration. Six proprietary coatings (Table 1) were found <br /> <br /> <br />and tested. Three of the clear coatings will be discussed in this section, <br /> <br /> <br />and the epoxy and polyurethane coatings will be discussed later. Each of <br /> <br /> <br />coatings 1, 2, and 3 could be brushed or sprayed on the wall, and both tech- <br /> <br /> <br />niques were used with each coating. The clear coatings depended on their <br /> <br /> <br />ability to coat and penetrate the wall as they were applied by spray or brush. <br /> <br /> <br />Penetration of the coatings was uncertain on a vertical wall, even when the <br /> <br /> <br />wall was soaked and excess coatings allowed to run down the wall. All of the <br /> <br /> <br />cubes with the clear coatings leaked when filled with water. The coated walls <br /> <br /> <br />did not leak as much as an untreated wall, but did leak excessively. The <br /> <br /> <br />clear coatings were very effective at beading and repelling rainwater, but <br /> <br /> <br />they did not keep the cube from leaking even against a small head of water. <br /> <br /> <br />In general, the results of the clear-coating tests were unsatisfactory. <br /> <br /> <br />Cementitious coatings <br /> <br />30. Six cementitious coatings (coatings 4-9) were obtained for testing. <br /> <br /> <br />Five of these were proprietary products, and one was a formulation made by the <br /> <br /> <br />author at the Waterways Experiment Station (WES). There are many cementitious <br /> <br /> <br />coatings which would probably make brick-veneer walls resistant to water pene- <br /> <br /> <br />tration; however, the above coatings were the ones initially found for test- <br /> <br /> <br />ing. In no way is their use to be construed as indicating a preference for <br /> <br />these coatings over others which were not tested. The cementitious coatings <br /> <br /> <br />developed a good bond with the brick-veneer wall. In general, the cementi- <br /> <br /> <br />tious material made the walls relatively impermeable to a water head for <br /> <br /> <br />heights which are of interest in making homes resistant to floodwaters. Some <br /> <br /> <br />were more successful than others. <br /> <br /> <br />Applications <br /> <br />31. There were two procedures by which the various materials could be <br /> <br /> <br />applied to the surface of a brick-veneer wall. One of the six coatings had to <br /> <br /> <br />be trowelled on the wall, while the others could be mixed to the consistency <br /> <br /> <br />of paint and brushed on the wall. Trowelling on the coating was <br /> <br />12 <br />