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

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478 CORK INSULATION<br />

case of other goods of different manufacture, but so far as we can<br />

see the main difference is in their water c<strong>on</strong>tent and c<strong>on</strong>sistency. The<br />

liquid emulsi<strong>on</strong> flows like cream and can be applied like a paint to<br />

metal, st<strong>on</strong>e and wood surfaces with a cheap fibre brush or a spray,<br />

while the thick emulsi<strong>on</strong>, or asphalt mortar, simply c<strong>on</strong>tains less water.<br />

It is plastic and can be troweled <strong>on</strong>, successfully taking the place of<br />

cement or gypsum plaster and forming <strong>on</strong>e c<strong>on</strong>tinuous waterproof<br />

sheet, requiring no scoring.<br />

Securing Air Tightness.—Tests have been made to ascertain the<br />

degree of air tightness obtained with various <strong>cork</strong> coatings. When<br />

exposed to forty pounds per square foot excess air pressure <strong>on</strong> <strong>on</strong>e<br />

side of an insulated wall, the rate of air leakage was in <strong>on</strong>e case,<br />

unprotected, 240 cubic feet of free air, 75 cubic feet when the first<br />

coat had been applied, and 10 cubic feet after the sec<strong>on</strong>d coat (presumably<br />

plaster) had been applied. When Korkphalt (asphalt) was<br />

used in joints the leakage without finish was 222 cubic feet air; 0.036<br />

cubic feet after a coat of Krodeproof asphalt emulsi<strong>on</strong> had been ap-<br />

plied, and no loss whatever after this had been covered with a coat of<br />

Korkseal asphalt mortar. This type of asphalt finish is therefore<br />

indispensable in dry ice cream hardening rooms and other places<br />

where an excess air pressure is being created by forcing air with a<br />

fan over the cooling coils in the bunker.<br />

Modern C<strong>on</strong>structi<strong>on</strong>.—This approved method of erecting <strong>cork</strong>board<br />

<str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> will be best understood by describing the various<br />

operati<strong>on</strong>s required when insulating mas<strong>on</strong>ry walls:<br />

In the first place the surface to be insulated must be made as flat<br />

as possible because no crevices or hollow spaces can be allowed<br />

behind the smooth flat <strong>cork</strong>board. Such cavities are apt to hold<br />

water of c<strong>on</strong>densati<strong>on</strong>, freezing to ice, which requires more space<br />

and thus breaks the b<strong>on</strong>d between <strong>cork</strong> and surface. C<strong>on</strong>crete walls<br />

may be smooth enough, but other c<strong>on</strong>structi<strong>on</strong>s usually require trueing<br />

up with cement mortar or plaster.<br />

Next apply over the flat wall that has been freed of all dirt and<br />

dust at least <strong>on</strong>e coat of asphalt emulsi<strong>on</strong> for the purpose of filling<br />

every pore and providing a base for the asphalted <strong>cork</strong>board. Spraying<br />

the emulsi<strong>on</strong> <strong>on</strong> under an air pressure of fifty pounds or more<br />

will drive in the asphalt more effectively and cheaper than can be<br />

d<strong>on</strong>e by hand. Two coats will be better than <strong>on</strong>e. Also the wall<br />

need not be dry because the emulsi<strong>on</strong> c<strong>on</strong>tains water, while hot<br />

asphalt should not be laid direct against any cold wall because it<br />

will chill and c<strong>on</strong>tract at <strong>on</strong>cet leaving pin holes, and it will not b<strong>on</strong>e?<br />

well with the wall. The emulsified asphalt also should be kept from<br />

freezing during applicati<strong>on</strong>, and it will flow much better if the air<br />

tempterature is not below 45° F.<br />

The first course of <strong>cork</strong>board is to be erected in a dip coat of hot<br />

asphalt, starting this course level and breaking all joints. The sec<strong>on</strong>d

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