You need more information to answer this question. A few of the items needed would be the height of the room as well as specifications on the framing (ie. 16" center verses 24" center). Does this addition need a roof? If so what type of roof do you want? Do you considers the decking on the roof part of the lumber? Are there windows? Those will need to be framed out. How many doorways. Etc... As you can see there are so many variables it would be impossible to say based on your question. The ceiling will be 8 foot, The centers will be 16" it does need a roof dont include the decking no windows
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To calculate the amount of lumber needed for the shed, you first need to determine the perimeter of the shed, which is 2(12+20) = 64 feet. Next, calculate the total wall area by multiplying the perimeter by the wall height: 64ft * 8ft = 512 square feet. To find the amount of lumber needed, divide the total wall area by the area covered by each piece of lumber. If you are using standard 8ft long 2x4 lumber, each piece covers 8sq.ft. Therefore, you will need 512sq.ft / 8sq.ft = 64 pieces of lumber for the walls.
To build a 16 x 16 x 8 room, you need to calculate the lumber for the walls and the ceiling. The walls consist of four sides, each 16 feet long and 8 feet high, totaling 512 square feet of wall area. For the ceiling, you need an additional 256 square feet of lumber. Depending on the framing style and the number of windows and doors, you may require additional lumber for studs, plates, and other structural elements.
Depending on the house, it is almost always cheaper to go up instead of out. Foundation work and be about as much as the rest of the addition. Going up avoids this.
To determine the amount of lumber needed for a 30 by 30 shed, you'll need to consider the design, including the walls, roof, and floor. For a basic estimate, you might require around 1,200 to 1,500 board feet of lumber, depending on the type of framing and materials used. Additionally, factor in extra lumber for doors, windows, and any interior framing. It's always best to consult a detailed building plan for a more accurate calculation.
A calculator. Addition.