The Cook County news-herald. [volume] (Grand Marais, Cook County, Minn.) 1909-current, 1915-11-11
Wooden Ice House.
Vie.wN

Wooden Ice House, insulated With S;
vi,
prepared by the United States Depart
ment Of Agriculture.)
Generally speaking, the construction
OF an ice house is a question of econ
ony for the dairyman. The cost of
harvesting and storing, interest on the
money invested, repairs, and depreci-
alton on the building should Offset the
saving in the melting of ice; beyond
this it is not good policy to go.
The location Of the house should be
such as to shield it as much as pos
siklo fr9u the wind and from the d.
rect rays of the sun.
The function of an ice house is to
prevent the outside heat from pass
Ing into the interior and melting tho
Ice; therefore the problem is to mini
mize tho passage of heat by interpos-
ing in the walls a material or a con-
struction which will resist it's transfer
from the outer to the inner side of
the building. There is no material
kIown that will entirely prevent the
passage Of heat; however, there are
materials which offer a high resis-
lance and are termed nonconductors
or insulators. The best insulators ap-
pear to be those that contain the
greatest amount of entrapped air con-
fined In the smallest possible spaces.
Formerly 1t was the practice in con-
structing buildings for the storage of
Ice or for cold-storage purposes to
provide series Of air spaces some of
which were as much as IL inches
wide, the supposition being that they
were dead-air spaces. AS a matter of
fact, however, as the air in contact
with the cooler surface fell while that
In contact with the warmer surface
rose, it produced circulation tending
to equalize the temperature of the
sides of the air space. Therefore an
air space inch wide is practically
as good as one IL inches wide. Air
circulation is valuable, however, be-
tween the insulated ceiling and the
roof of an ice house in order to break
up the heat radiation through the roof.
NO entrance or exit of air should
be allowed to take place in a room
where ice is stored, especially at or
near the ground line, as the cold cur
rents of air at the bottom will filter
through. If the walls and foundations
ire kept absolutely tight at the bot
tom, an opening at the top has but
little effect, as the warm air entering
will remain at the top of the room.
When 1t is necessary to remove ice
from the house, the door should be
kept open as short time as possible,
and where covering material is used
the ice should be carefully covered.
In properly insulated house great
advantage is that no covering is re-
quired. The ice is packed on the floor
uf the room, depending on the insu-
lated walls and floor for protection
from the outside heat. But in the
cheaper houses it is better to cover
the ice with some material, such as
sawdust or mill shavings. A layer of
tie Insulating material should be
placed directly on the floor and the
Ice stacked thereon: there should also
be layer packed between the ice and
the wallis. Ice should never be placed
directly on the ground, soil being a
fairly good conductor of heat, espe-
cially when wet, as the floors of all
Ice houses are sure to be-. The larger
percentage Of waste, however, is due
20 the entrance of heat through the in
sulation Of the walls and floor: conse-
quently they should be carefully con-
structed.
Insulation.
AS sawdust and shavings are shown
in some of the typical designs, it is
not to be understood that they are the
best insulators for this class of build
ings. They are used because they are
cheap and can be haa in any part Of
the country, and If kept dry are good
insulators. It is a very difficult prob
lem, however, to keep them dry, and
when they are to be used great care
should be exercised in the construc-
ton Of the walls in order to keep out
the moisture.
Planing-mill shavings are better
thaa sawdust for insulating purposes;
they are elastic, do not settle readily,
and do not absorb moisture so read
fly as sawdust; and, most important.
are free from dirt, bark, or chips.
When used as filling for walls or CELL
ing, they should be we'll packed into
place to prevent settling
Sawdust has in the past been used
to great extent in rural districts for
insulating walls Of small cold-storage
buildings, due to the fact that it is
available In most country districts
and usually without cost. 1t is not a
very satisfactory material for insulat-
ing purposes, however, as it is al
ways more or less damp. Further.
more the dampness not only destroys
its insulating value, put it favors the
growth Of mold and rot, first in the
xavdns. its~ly and then In the walls