MILL CONSTRUCTION BUILDINGS 



Fig. 7. Framing and Floors in Place in Advance of Walls. 



Basement Creosoted wood block floors for basements or for 

 Floors shop floors give excellent service and are easy for 



workmen to stand on. A floor of this type made 

 of blocks well seasoned before treatment and laying, having 

 the joints made with an approved cement or pitch filler, should 

 last twenty years or more. Seasoning prevents shrinkage in 

 the blocks after laying where used indoors. This is the oppo- 

 site condition to that met in outdoor work. In the creosoting, 

 an empty cell treating process, with five to eight pounds of 

 oil per cubic foot, gives an excellent floor at moderate cost. 

 When not subject to moisture or water soaking, etc., the blocks 

 can be laid with close joints. Under moist conditions, a 1/g- 

 inch joint closed with pitch is advisable. A good specification 

 for a wood block floor is as follows : 



In wet ground, first spread a thoroughly compact layer 

 of cinders or gravel about 6 to 12 inches deep as the sub- 

 foundation. Then place a 4-inch layer of Portland cement 



Page twenty-five 



