Fig. 225.—Girder Plan for 6-Story Building.

FLOOR AND COLUMN CONSTRUCTION FOR SIX-STORY BUILDING.—The building was 91×112 ft.; 56 columns spaced 16 ft. apart carried the girder system shown by Fig. 225, which in turn supported a 3½-in. floor slab. The walls and partitions were not concrete. The following records were kept by the authors:

Forms.—The column forms were built as shown by Fig. 226. The boards were 1½-in. stuff, surfaced on four sides; the yokes were spaced 2 ft. apart. The 1×6-in. pieces were nailed to the 2×4's with 8-d. nails with heads left projecting for easy pulling. The girder forms, Fig. 227, rested on the column forms and on intermediate posts half-way between columns. These intermediate posts were 3×4's with 4×4×12-in. head blocks nailed to their tops and wedges under their bottoms. The girder molds were 1½-in. stuff, and to the side pieces were nailed 1×4-in. cleats; the bottom and side pieces were connected by ⅜×4-in. lag screws spaced 28 ins. apart. The floor slab stringers were carried on the 1×4-in. cleats; they were spaced 28 ins. apart and were not nailed; neither were the 1×6-in. lagging boards nailed to the stringers. The point to be noted is the design and construction of the forms so that they could be put together and taken apart easily. The lumber required for forms for one floor 91×112 ft., or, say, 10,200 sq. ft., was as follows:

Lumber for columns, ft. B. M.9,000
Lumber for 10×10-in. beams, ft. B. M.7,600
Lumber for 5×10-in. beams, ft. B. M.2,700
Intermediate 3×4-in. posts, ft. B. M.1,000
Lagging, 1×6-in. boards, ft. B. M.9,000
Stringers, 3×4 ins., ft. B. M.4,500
———
Total ft. B. M.33,800

Fig. 226.—Column Form for 6-Story Building.

In round numbers, we can say that 34,000 ft. B. M. of lumber were used for 10,000 sq. ft. of floor area, or 3.4 ft. B. M. per 1 sq. ft. Enough forms were provided to erect two complete floors; the forms for the lower floor being removed and erected again for the second floor above, thus using all the lumber three times. With carpenters at $3.50 for 8 hours, the forms were framed ready for erection for $4 per M. ft. B. M. The lumber framed ready to erect cost them:

Lumber, cost per M. ft. B. M.$26.00
Labor, framing per M. ft. B. M.4.00
———
Total per M. ft. B. M.$30.00