56 



BULLETIN 98, U. S. DEPARTMENT OF AGRICULTURE. 



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together. No cement should be used in the joints, but only on the 

 back of the blocks. 



The floors should be of concrete and should preferably be laid 

 solidly on the insulating material. The insulating blocks should be 

 laid in asphalt and coated over the top with hot asphalt and then 2 

 inches of concrete laid directly on the insulating material and finished 

 with a coat of 1 inch of Portland cement. 



In cold-storage rooms designed for storing milk and milk products 

 an insulation should be used that will take a waterproof interior 



finish, such as Portland or 

 other hydraulic cement, or 

 vitrified hollow tile laid up 

 in cement mortar. This 

 construction permits of 

 being thoroughly washed 

 out with either hot or cold 

 water without injury to it 

 or to the insulation proper. 

 Wooden floors have 

 proved very unsatisfactory, 

 as they rot out in a com- 

 paratively short time, due 

 to the fact that they are 

 more or less absorbent and 

 can not be readily cleaned 

 and therefore retain odors 

 that may be injurious to 

 delicate goods. The abil- 

 ity to keep storage rooms, 

 especially where used for 

 storing dairy products, in 

 a sanitary condition by 

 thoroughly washing will be 

 appreciated by dairymen. 

 When brick or concrete 

 are used in construction the 

 exterior of the walls should be coated with some efficient waterproof- 

 ing compound; the walls should be thoroughly dried out, however, 

 before the compound is applied. The customary method has been to 

 waterproof the interior of the walls, allowing the outside moisture to 

 soak through the walls until it reaches the inner film of the waterproof- 

 ing compound. It is much better to waterproof the outside surface of 

 the walls, thereby preventing the moisture from penetrating through 

 to the inner side. In cold-storage rooms the doors perhaps afford 

 the weakest point in the insulation. While their insulation is of 



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 per degree difference in temperature. 



