24 inches. Walls shall be herringbone braced or fire stopped with one row of 2" by stud deep blocking so that the maximum concealed space is not over 7'-0". Where so indicated, install two rows of horizontal blocking of stud thickness cut in between studs, for securing corrugated Lintels, not otherwise shown, shall be not metal siding. less than two - 2" x 4" members on edge. for support of plumbing fixtures, Solid blocking case work, etc., shall be installed as required for proper support thereof. d. Sheathing, unless otherwise shown, shall be laid diagonally with driven sides and ends, and nailed as shown or hereinbefore specified. Tongue-and-grooved and shiplapped joints shall be placed so as to provide natural weathering. Two bearings shall intervene between splices in the same board, and two boards shall intervene between splices over the same bearing. Prior to application of composition roofing over roof sheathing, damaged work shall be replaced, loose or cupped boards renailed and all sheathing swept broom clean. e. Furring. of sizes called for on drawings, shall be installed on walls where shown. Furring strips shall be erected plumb and rigid, using wood shims as required. Furring for paneling in metal buildings shall be bolted to wall girts as shown. Wall framing shall be furred as required to conceal all pipe, condult, ducts, ete. in finish areas. f. Posts and Columns shall be accurately set and rigidly anchored as indicated or required. Bottom ends of all posts shall be coated with bituminous paint before setting. g. Stairs, walkways, handrailings, etc., shall be constructed to size and detail shown on the drawings. Stai carriages shall be cut from a single piece of lumber. Risers shall be of uniform height and treads of uniform width, except as otherwise shown. The front edges of treads shall be beveled slightly. Hand and wall railings shall be in one piece for each run. All framing and finish shall be rigidly secured. h. Iadders and catwalks shall be constructed of wood selected from Lumber delivered to the jobsite for structural purposes, so as to be free of structural defects that would make it unsuitable for the use intended. Knots shall not appear in the narrow faces of side rails, cleats Or rungs, and cross-grain shall not exceed a slope of one 8-6