Calculate the Amount of Material Needed to Build Exterior Wood Stud Walls

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  As a rule of thumb I figure the number of studs I need for a wall is 1 stud for every 10 inches around your building. They should be 16 inch centers but every 10 inches will allow for the extra studs needed for the corners, frame window and door openings and so on. For the top plates and bottom shoes just find the total distance around, multiply it by 3 and maybe add a little for wastage and that is the linear feet you would need. The lumber needed to sheath the walls is the total distance around as just now multiplied by the height of the wall (including the trimmer joist and kneewall if you have one), plus 10% for wastage. If sheathing with plywood or particle board just divide the square footage by 30. To find the square footage of the Gable ends divide the width of the gable by 2 and multiply it by the height (at the peak or ridge) plus 10%. Example = 30 ft X 40 ft building = 140 ft around X 9 ft high = 1260 + 10% = 1386 square feet of lumber needed. Example 1260 divided by 30 = 42 sheets. Example for the gable ends, if the building is 30 feet wide and the peak is 5 feet high -- 30 ft divided by 2 = 15 X 5 = 75 + 10% = 82.5 square feet. Plans how to build  outside wood walls.    
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