34 MANAGEMENT OF DAIRY PLANTS 



Such a wall is suitable for a one-story creamery, and is prac- 

 tically as attractive as one made of brick. 



Particular care should be taken that joints are well filled 

 with properly prepared mortar. If not, rain dashed by heavy 

 wind will beat through the wall. Special attention should also 

 be given to assure that ends of blocks are properly joined with 

 mortar. Owing to their construction, this becomes the most 

 diflBcult task in laying tile. 



The principal advantages of hollow tile are its comparative 

 cheapness and low cost of laying. Air spaces in blocks serve 

 as insulation if the walls are absolutely tight in construction. 

 If any particular objection can be made, it is primarily that a 

 hollow-tile wall may be more readily damaged, as by a wagon 

 backing up against it. If a hole is made, the hollow tile affords 

 an excellent hiding place for mice and rats. It is also more 

 difl&cult to make an air-tight wall from hollow tile. 



3. Combination of Brick and Hollow Tile. — This is becoming 

 the more popular material for wall construction. It usually 

 consists of a 4-inch brick for the outside wall, then a 2-inch air 

 space, and finally a 4-inch hollow tile, making a lo-inch wall. 

 The brick and hollow tUe should be securely bonded with 

 headers. This combined material has advantages over hollow 

 tile in that it gives the building an outward appearance of solid 

 brick, and the latter can be laid more easily to form a tight wall. 

 It has the advantage of a solid brick wall in being less expensive 

 and at the same time just as durable, since the inside wall is 

 covered with cement plaster. Inside partitions are usually 

 built from hollow tile exclusively. 



4. Cement Blocks. — The cement blocks used for creamery 

 construction are either 8 inches by 8 inches by 24 inches or 

 else 8 inches by 8 inches by 16 inches in size. These blocks 

 should be double, with two or four wire headers between halves. 

 Those used for outside walls are usually made rock-faced for 

 the sake of appearance; those for inside partitions are smooth- 

 faced. The blocks 'should show good workmanship in construc- 

 tion, be made of good material, and show a sustaining strength, 

 under test, of at least 1,000 pounds per square inch after they 



