94 



COST OF FORMS. 



In keeping costs on forms the first cost per 1,000 ft. B. 

 M. of lumber, the number of times used, labor cost of 

 erecting, labor cost of oiling and patching, labor cost of 

 wrecking, cost of labor cutting nails, etc., all expressed 

 in M. ft. of B. M. should all be carefully kept. It is also 

 well to keep the number of square feet of forms exposed to 

 the concrete. A dry concrete will allow forms to be removed 

 the next morning; however, the shores should not be re- 

 moved for 4 to 6 weeks. When very wet concrete is used, 

 forms should not be removed for 48 hours. In large 

 arches forms are not removed in less than 14 to 28 days. 

 Floor forms are usually left in place about a week 

 sometimes two weeks. By using panel construction the 

 cost of forms can be greatly reduced. By using a laborer 

 with 2 carpenters ordinary forms for walls, arches, etc., 

 can be framed and erected for $10.15 per 1,000 ft. B. M. ; 

 wrecked for $2.56 per 1,000 ft. B. M. With panels the 

 additional cost per 1,000 ft. B. M. amounts to about $0.86 

 for each move. 



Factory buildings reinforced throughout, Including foot- 

 ings, outside and inside columns, walls, girders, beams, 

 floor slabs, roof and stairs, will cost $20 per cu. yd. of con- 

 crete placed. Of this, 25 to 35% will be forms, including 

 material, erection and removal. This quotation will vary, 

 of course, greatly, depending on price of material and 

 labor, design and number of times the forms can be used. 

 With proper design and good carpenters, forms can some- 

 times be used 3 to 4 times. On buildings with typical 

 panels, beams and girders, and 8 to 10 stories, the forms 

 might run to $6 a cu. yd. in places. On the other hand, 

 a 2 or 4 story building which was very much cut up 

 might run as high as $7 or $8 per cu. yd. 



In plain floor slabs using expanded metal, Clinton wire, 

 etc., forms may cost from $2.20 to $3.25 per cu. yd. on a 

 16 ft. span, and loads 400 Ib. and 100 Ib. respectively. For 

 beam and plate construction (Ransome system), $5.50 to 

 $10.50 per cu. yd., and loads 500 Ib. and 100 Ib. respectively. 



Forms for floors cost from 4 1 / to 6 cents per sq. ft., in- 

 cluding everything. Wall forms (4 in. walls) cost from 8 

 to 11 cents per sq. ft. of wall. Column forms 22 cents 

 per linear ft., the quantity of concrete being 3.7 cu. yd. 

 per 100 linear feet of column. 



For floor work the prices range from 10 to 20 cents per 

 sq. ft.; wall work, 5 cents. Of course, this is a case 

 where the forms can be used several times. 



