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<br /> <br />Test Closure Wall <br /> <br />3 Same as Tests and 2. <br />(Continued) <br /> <br />Test Results <br /> <br />depths greater than <br />approximately 15 in. <br />This type closure will <br />work, but it is im- <br />practical because it <br />takes too much caulk- <br />ing, time, and care to <br />seal it against the <br />wall and floor. <br /> <br />The upper part of the wall deflected toward the water for low water <br /> <br />depths as had been the case in the 8- by 26-ft brick-veneer prototype wall <br /> <br />tests. <br /> <br />Wall 2 <br /> <br />Since adequately reducing the flow of water through the brick-veneer wall <br /> <br />was difficult, it was decided to use a double brick wall with a water barrier <br /> <br />between the two layers of brick. The height of the second wall was to be a <br /> <br />reasonable distance above the expected flood level. This wall was constructed <br /> <br />as follows: <br /> <br />o A one-layer brick wall was constructed and coated with asphalt cement. <br />Roofing felt (Figure 38) was embedded in the asphalt cement in one half <br />of the wall, and polyethylene was embedded in the other half (Fig- <br />ure 40). Another layer of asphalt cement was put over the felt and <br />polyethylene to form the water barrier. The barrier was also cupped <br />and attached to the floor to keep water from penetrating the wall. <br /> <br />o Another layer of brick was constructed in front of the water barrier to <br />protect the barrier and also to conceal it for appearance. <br /> <br />. The double wall added rigidity and strength, allowing more support <br />against a greater depth of floodwaters. <br /> <br />. Channels were attached to the brick at the sides of the door space and <br />angles were fixed at the base to hold a piece of plastic coated plywood <br />as a closure (Figure 40). Two sheets of plywood (Figure 41) were used <br />to check water penetration of the barrier. The second sheet of plywood <br />was placed on the same side of the barrier as the water was applied to <br />check: <br /> <br />o Critical location of the closure. <br /> <br />. Time involved for space between the two sheets of plywood to fill <br />with water. <br /> <br />39 <br />