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© Infrastructure Health & Safety Association (IHSA) 41 • Institute for Work & Health (IWH) Calculating Load Weights Using Area (Use Table 1.3 in M035) When weights are based on area and a standard size or gauge: • Weight = area × unit weight in lbs/ft 2 • Calculate the area in ft 2 • Convert the area to weight When weights are based on area and thickness in inches: • Weight = area × thickness in inches × weight in lbs/ft 2 • Calculate the area in ft 2 • Convert the area to weight Example 1: Calculate the weight of a solid 2" gypsum-sand plaster partition with the following dimensions. Step 1: Calculate the area. Area = L × W = 8 ft × 4 ft = 32 ft 2 Step 2: Locate the unit weight in Table 1.3 Weights of Materials (Based on Surface Area). Solid 2" gypsum-sand plaster = 20 lbs/ft 2 Step 3: Calculate the weight. Weight = area × unit weight/ft 2 = 32 ft 2 × 20 lbs/ft 2 = 640 lbs

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