ICE SUPPLY 



care necessary to produce an absolutely air-tight compart- 

 ment. Once the air is allowed an opening, moisture will be 

 taken in and condensed on the studding, producing decay 

 and destroying the insulating value of the material with 

 which it comes in contact. But even when the air spaces 

 are perfectly constructed they are of short duration, as they 

 soon become leaky, due to shrinkage of lumber and settling 

 of the building. 



After the air spaces were found impracticable, different 

 kinds of manufactured insulating materials came on the mar- 

 ket. In general it may be said that the requirements of a 

 good insulator are that it be a first-class, permanent non- 

 conductor of heat, will not absorb moisture, and be prac- 

 tically fireproof. Most good non-conductors are porous and 

 contain from 90 to 96 per cent of finely divided air spaces. 





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FIG. 2. INSULATING WALL CONSTRUCTION. 



The relative insulating value of wall construction in Type 4 will depend upon 

 whether the shavings are dry, damp or moist. If dry this construction will 

 rank second, and if damp, third, of these methods of wall insulation. 



Nine 



