About 50 pounds
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Well, darling, a 4 x 8 plywood sheet has a total area of 32 square feet. To convert that to square meters, you simply divide by 10.764, giving you approximately 2.97 square meters. So, in short, there are about 2.97 square meters in a 4 x 8 plywood sheet.
13 ft by 23 ft = 299 ft2 and one standard sheet of plywood is 4 ft by ft = 32 ft2. 299 / 32 = 9.34 sheets, so you will need to purchase 10 sheets of plywood.
It depends on the density of the plywood. This site shows some plywood densities in kg/m^3. Let's say your plywood is 500 kg/m^3 (which is at the low end of the plywood densities isted on that page). Converting the dimensions of the plywood to meters gives the following: height: 4 ft = 4 ft * (12 in/ft) * (2.54 cm/in) * (1m/100cm) = 1.22 m width: 8 ft = 8 ft * (12 in/ft) * (2.54 cm/in) * (1m/100cm) = 2.44 m thickness: 18 mm * (1m/1000mm) = .018 m The volume of the plywood is height * weight * thickness = 1.22 * 2.44 * .018 = .0535 m^3. Weight is density * volume. So, at 500 kg/m^3, the plywood would weigh: 500*.0535 = 26.8 kg. 1 kg is approximately 2.2 pounds, so 26.8 kg is 26.8 kg * (2.2 lb/kg) = 58.9 pounds. If, however for example, your plywood is 700 kg/m^3, it would weigh 40% more, or 82.5 pounds.
38 divided by 4 is 9.5
assuming standard sheet is 4 x 8 = 32 square feet roof is 29 x 45 = 1305 sq ft you need 1305/32 = 41 sheets