ICE SUPPLY 



placed in the wall should be packed in at the rate of 12 Ibs. 

 per cu. ft. Any greater density destroys its insulating 

 value. Workmen do not like to handle mineral wool, as it 

 pricks the hands and little pieces floating in the air are hard 

 on eyes and lungs, all of which may cause the work to be 

 slighted. 



One of the most efficient and high grade insulating 

 materials available is cork. It, perhaps, comes as near ful- 

 filling all the requirements of a good insulator as any mate- 

 rial used, as it is made up of innumerable sealed air cells, 

 which prevent the passage of both heat and moisture. Cork 

 is very slow burning and when coated with cement becomes 

 practically fireproof. It also has the advantage of being 

 odorless, clean, elastic and durable. 



Cork may be had in either sheet, block or granulated 

 form. The sheets are of two varieties, the pure cork and 

 impregnated. Cork sheets come in thicknesses of i, 2 and 

 3 inches, and are usually 12x36 inches. It is very convenient 

 to handle and very efficient, as only a small space need be 

 sacrificed in insulation. There is no danger of its settling 

 in the walls and by applying a cement finish a permanent, 

 damp proof and fireproof insulator is provided. Eight to 

 ten pounds of granulated cork per cubic foot makes a good 

 insulator. While cork will not absorb moisture to any 

 considerable extent, it will rot if exposed to constant wet- 

 ting and drying. For this reason the damp proofing is 

 important. Where ground cork is used in floors it should 

 be covered with a double thickness of matched boards, be- 

 tween which two layers of waterproof paper have been 

 placed. Where sheet cork is used in floor construction the 

 sheets should be set in hot pitch or asphalt and the exposed 

 surface completely covered with the preparation before 

 applying the cement coating. Sheet cork used on wood 

 floors should be covered the same as the granulated cork. 

 For ordinary cold storage rooms and ice houses a 3-inch 

 layer of sheet cork is sufficient and will cost from four to 

 six cents per square foot per inch of thickness. 



Hair is nature's insulator. It is very efficient and quite 

 indestructible. Twenty-four inch widths of hair quilt are 

 applied between furring strips and paper. No nails should 



Eleven 



