![]() ![]() The modern stucco we have today is made of Portland cement materials, sand, and water.Īll the materials mentioned are mixed to create a plaster that can be spread on walls, ceilings, or other structures, to make a smooth, hard surface once hardened and dried. ![]() Traditional stucco is made from lime, sand, and water. Plus, the material does not require much maintenance, making it a popular exterior material choice for DIY projects. Despite its low cost, stucco is durable, doesn’t rot quickly, and can resist fungus well. Portland Cement Plaster ( stucco) is a construction material widely used on indoor and outdoor building surfaces. How To Stucco a Concrete Wall – Step by Step Guide.Perhaps other readers can share information on this subject. However, we don't know how much the absorption would affect adhesive performance, or if this absorption possibility was considered when the 3-pound limit was set. And we can assume that most of the moisture or solvent in the flooring adhesive is available for absorption by the floor. We can estimate the total amount of moisture or solvent in the adhesive that's lost under ambient conditions. The average total moisture loss from all adhesives tested was about 120 pounds per 1,000 square feet of floor area. The final moisture or solvent loss averaged about 48% for all samples tested, although one sample lost 84% of its initial weight. Ninety percent of the total moisture or solvent loss occurred within 24 hours after initial adhesive placement. This water loss represents about 15 to 20 pounds of moisture per 1,000 square feet of floor area. Of the eight tile adhesives tested, average weight loss at the manufacturers' stated open time was about 10% of the initial weight. However, on an absorptive surface, some of the solvent or water would be expected to enter the substrate. Because the plastic plate was nonabsorptive, all of the weight loss could be attributed to evaporation. By measuring differences between starting weight and subsequent weighings, we could then determine how much moisture or solvent was lost with time. We weighed the plates right after placing the adhesive, after the manufacturers' stated open time, and at various times after that until a constant weight resulted. We used a tile trowel to place 80 to 100 square inches of tile adhesive (about a 9-inch-square tile size) on a hard 1/4-inch-thick pre-weighed plastic plate. During the testing, we considered the same issue, so we performed some laboratory drying tests to determine the amount of water or solvent lost due to evaporation or absorption by the concrete substrate. Mow much moisture is likely to be absorbed, and is this value enough to affect flooring performance?Ī.: We performed pull-off tests to evaluate the effect of water-vapor emissions on floor-covering adhesive strength (search the Concrete Construction article archive for "Effect of Water-Vapor Emissions of Floor-Covering Adhesives," January 1999). We asked the concrete contractor and the flooring installer if they know how much moisture might be absorbed, but neither one was sure. Before applying the floor covering, we plan to wait until the emission rate reaches the 3-pound limit, but we've heard that the concrete surface can absorb moisture from the flooring adhesive. The floor-covering manufacturer requires a maximum water-vapor emission rate of 3 pounds/1,000 square feet/24 hours. Q.: We're the general contractor for a commercial building in which the concrete floor will receive a moisture-sensitive covering. ![]()
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