. Economic Papers. e generally used for sheathing. If one inchlumber is used it should not be over 8 inches wide in order to preventcupping and splitting from swelling and shrinking. For ordinary cul-vert forms on country roads 2 inch plank 10 to 12 inches wide will befound most satisfactory. They will not warp, may be used over severaltimes and require fewer studs than one inch lumber. Studs should be spaced from 18 to 24 inches for one inch sheathingand from 3 to 5 feet for two inch sheathing. The spacing is dependentupon the wetness of the concrete, the thickness of the wall, and thefinish
. Economic Papers. e generally used for sheathing. If one inchlumber is used it should not be over 8 inches wide in order to preventcupping and splitting from swelling and shrinking. For ordinary cul-vert forms on country roads 2 inch plank 10 to 12 inches wide will befound most satisfactory. They will not warp, may be used over severaltimes and require fewer studs than one inch lumber. Studs should be spaced from 18 to 24 inches for one inch sheathingand from 3 to 5 feet for two inch sheathing. The spacing is dependentupon the wetness of the concrete, the thickness of the wall, and thefinish desired on the surface. For surfaces which are to be coveredwith earth the spacing may be increased. Studs are usually 2x4or 2x6 lumber for one inch sheathing depending on the height ofthe form and the spacing. For two inch sheathing, 2x6, 4x4, 3x6and sometimes 4x6 lumber is used. The carpenter work may ordinarily be done by unskilled labor, but onlarge jobs it will generally pay to use an experienced carpenter. It. Fig. 11.—Methods of bracing forms, (a) Wired forms; (b) Cross-brace; (c) Brace against s(d) Cleat for brace; (e) Support for pipe rail; (/) Brace for side forms. N. C. Geological and Economic Survey. PLATE IV.
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