Cork insulation; a complete illustrated textbook on cork insulation ...

216 CORK INSULATION
joists of such ceiling and join it with floor (ceiling) <strong>insulation</strong>
above. In old buildings containing concrete ceiling slabs so
supported as to make cutting through for continuous insula-
tion impossible or not feasible, the wall <strong>insulation</strong> is some-
times carried out on the underside of ceiling a distance of 3
feet and then the entire floor area above is insulated.
The effect of this is to obtain an insulating value at the
uninsulated perimeter of the concrete slab of something in
excess of 36 inches of concrete, which will suffice for normal
temperatures, and places much the greater part of the ceiling
<strong>insulation</strong> on the floor above.
In old buildings of such design that continuous <strong>insulation</strong>
is not possible or feasible, then the <strong>insulation</strong> must be applied
to the underside of wood sheathed joists, or to the under-
side of concrete slab and around all beams and girders. Great
care should then be taken to properly prepare the surfaces
for such <strong>insulation</strong>, to properly apply it, and then finally to
finish such <strong>insulation</strong> off in accordance with the most approved
modern practice. Especial care should be taken to carry the
<strong>insulation</strong> around all beams and girders, it never being permissible
to construct any kind of false ceiling at the bottom
line of beams or girders and apply <strong>insulation</strong> to such false
work, leaving closed air spaces above, because such spaces
will fill with water and the <strong>insulation</strong> will fail. If the height
between floors of the building is greater than required for the
cold storage rooms, then false ceilings hung from above are
permissable if they leave enough space between for good
ventilation. For rooms of moderate width, under the sarr>e
conditions, where there will never be extra weight applied on
top of the cold storage room ceiling construction, T-irons are
frequently supported on the side wall <strong>insulation</strong>, 12 inches
apart, to support two layers of corkboard, one above and one
below, to form a self-supporting cork ceiling of satisfactory
utility.
:
98.—Doors and Windows.—The three principal heat losses
that occur in the average cold storage room, after it has been
brought to temperature, are
(a) Heat leakage through the insulated floor, walls and ceiling.
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