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

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280 CORK INSULATION<br />

sand* for each thousand square feet of surface. Do not mix<br />

too much mortar at a time, make it fairly stifif, and do not<br />

add any lime.<br />

Portland cement mortar, or "backing," should be uniformly<br />

<strong>on</strong>e-half inch in thickness over the whole surface of the <strong>cork</strong>-<br />

boards and n<strong>on</strong>e should be allowed <strong>on</strong> the sides and ends.<br />

This cement backing is never applied directly to the area to<br />

MG. 1-5. CORKBOARD KRECTED TU CONCRETE WAELS AXD COLL'.MXS<br />

IN PORTLAND CEMENT MORTAR.—xNOTE THE SIMPLE MORTARBOARD<br />

AND HOPPER DEVICE FOR APPLICATION OF THE "BACKING" DE-<br />

SCRIBED IN THE TEXT.<br />

be insulated, as some might suppose, but to the surfaces of the<br />

individual <strong>cork</strong>boards before they are set in place. To facili-<br />

tate the applicati<strong>on</strong> of the cement backing to the <strong>cork</strong>boards,<br />

a mortar board about 4 feet square is equipped with a simple<br />

runway and hopper attachment that is entirely practical and<br />

very satisfactory. Across the top of the mortar board nail<br />

two strips parallel to each other and exactly 12 inches apart,<br />

*1 barrel cement = 4 sacks = 4 cubic feet = 400 pounds; 1 cubic yard sand =<br />

approximately 2,400 pounds—based <strong>on</strong> tables in "C<strong>on</strong>crete, Plain and Re'nforced," by<br />

Taylor and Thomps<strong>on</strong>.

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