io6 DAIRYING 



concrete, brick or cement walls can be covered with matched 

 lumber by nailing narrow strips of wood to the wall, and after 

 covering these with waterproof paper, nail on the matched 

 boards; this will take the place of an outside waterproof cover- 

 ing of some kind. When paper is used for protecting walls from 

 dampness each layer of paper should lap over several inches, and 

 two layers are better than one. 



The studding are placed against this outside wall, and a 

 space of six to twelve inches is left for filling with dry shavings, 

 sawdust or some insulating material. On the inner side of the 

 wall around the studding space, matched lumber is nailed, then 

 a layer of paper, then narrow strips of furring, to which is nailed 

 the inside layers of matched lumber; the object of this air space 

 furnished by the narrow strips of furring being to protect the 

 shavings or insulating materials from the dampness of the melt- 

 ing ice. 



These directions are given only to illustrate a way of ob- 

 taining the essential features of insulation, which are, the pro- 

 tection of the insulating material from moisture and from cur- 

 rents of air, both of which may come from the outside and from 

 the inside of the building. 



Any suitable material or combination of materials may be 

 used in building the walls. The principal objects to be attained 

 are efficiency and economy of construction that will keep the 

 insulating material dry a* all times. 



856. The walls of a refrigerator do not need the air space 

 provided by the strip of furring mentioned above, as there should 

 be no dampness coming to the wall from the inside of the room. 

 This inside wall in the refrigerator, however, should be built of 

 odorless wood, which may be either oiled, shellacked or white- 

 washed. It is claimed that a little salt added to the whitewash 

 will prevent its rubbing off when touched. The so-called cold 

 water paints may be used, and to these or to the whitewash some 

 disinfectant may be added to kill molds, and if the place is at all 

 damp, formalin or dilute solution of corrosive sublimate may be 

 used. 



