56 
BULLETIN 
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 hi construction the 
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Fig. 23. — B. T. U. transmitted per square foot per 24 hours 
per degree difference in temperature. 
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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 
