62 HARVESTING, STORING, AND MARKETING 



and Pennsylvania, filling the space with this material will 

 provide adequate insulation. The thickness of the insulating 

 material should be increased in more severe climates. Other 

 cheap insulation materials are sawdust and mill shavings. 

 It is essential that the insulation material, of whatever nature, 

 be kept dry. 



For insulating purposes the following information from 

 the Engineering Department of Pennsylvania State College 

 is presented. One inch cork board is approximately equal in 

 value to: 



1 inch granulated cork. 8 inches dry soil. 



1 inch Celotex. 48 inches wet soil. 



1 inch insulite or insulex. 12 inches brick. 



IVs inches sawdust. 12 inches hollow tile. 



1% inches shavings. 24 inches concrete. 



3^4 inches wood. 30 inches stone. 



Brick, stone, hollow tile, concrete, etc., do not insulate 

 sufficiently without interior layers of non-conducting mate- 

 rials. Interlocking tile waterproofed on the inner and outer 

 walls provides good insulation at a moderate cost, as well as 

 protection from fire. Corkboard, wood fiber, hair^ asbestos, 

 mineral wool, cinders, and mica are some of the newer insulat- 

 ing materials. 



The ceiling should have from 4 to 6 inches of insulation. 

 Frequently it consists of granulated cork spread evenly over the 

 matched boards, but a foot or more of finely broken or well- 

 packed straw is also satisfactory. 



An earth floor overlain by a wood floor raised 6 to 8 inches 

 on stringers or concrete sills gives good humidity conditions. 

 Rodents may be controlled by covering the earth floor with 

 wire netting or hardware cloth of i^-inch mesh. 



A concrete driveway should be provided directly through 

 the building so that fruit may be unloaded conveniently at 

 any point. This driveway may be filled with fruit after the 

 rest of the house is full. 



