114 Concrete Silos 



by placing five or six bolts % inch by 4 inches in a 

 perpendicular line 3 or 4 inches outside of the door 

 post. These bolts may be passed through the metal 

 lath with the nuts on the outside. As the plastering 

 progresses, care should be taken that the bolts are 

 made to project perpendicularly from the wall. 



The mixture for the scratch coat consists of 1 part 

 of cement, 2% parts of sand, and 10 per cent as much 

 hydrated lime as cement. About 1 bushel of hair to 

 every 300 square feet of surface to be covered must be 

 used in this first coat. For the plastering of a silo 16 

 by 30 feet, about 7 sacks of hydrated lime and 5 bush- 

 els of hair will be required. The lime should be soaked 

 up 10 or 12 hours before it is to be used. The hair 

 should be thoroughly beaten part on a barn floor, and 

 after being soaked several hours should be carefully 

 picked to pieces and worked into the lime putty which 

 has been prepared. If care is used, the hair will be 

 thoroughly mixed with the lime and the mixture can 

 be added to each batch of the cement mortar as it is 

 being prepared for use. It will take about 1% pailfuls 

 to each 2 bag batch of mortar. It will be well for the 

 plasterer to make some estimate as to the right amount 

 of this to use in each batch, so as to have enough to 

 use for the whole scratch-coat. This coat will require 

 about 13 two-bag batches of mortar for 16x30 foot 

 silo. 



Two good plasterers will be required, and four 

 tenders, two to measure materials and mix the mortar, 

 one to carry and elevate it to the proper platform, and 

 the fourth to receive the mortar on the platform and 

 place it on the mortar-boards. This last man should 

 do all the moving and shifting work, so that the plas- 

 terers may not be delayed at any time. 



