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

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252 CORK INSULATION<br />

106.—Ceilings—Self-supported.<br />

(14) Double layer, T-ir<strong>on</strong>s and Portland cement core.<br />

Up<strong>on</strong> the top edges of the side wall <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> shall be<br />

placed, running the short way of the room,* 2x2xy^-\nch,<br />

CROSS SECTION<br />

("PORTLAND CEMENT PLASTER<br />

CORKBOARD<br />

2"-Z«^" TE.£ IRON<br />

^"PORTLAND CEMENT BACKING<br />

CORKBOARD<br />

FINISH<br />

FIG. 95.—CEILINGS; SELF-SUPPORTING. ARTICLE 106 (14).<br />

or 2x2x5/16-inch T-ir<strong>on</strong>s, spaced at a distance of 12 inches<br />

between the vertical secti<strong>on</strong>s of the T-ir<strong>on</strong>s (not from center<br />

to center). Up<strong>on</strong> the flanges, or horiz<strong>on</strong>tal secti<strong>on</strong>s, of the T-<br />

ir<strong>on</strong>s, <strong>on</strong>e layer of . . .-inch pure <strong>cork</strong>board shall be carefully<br />

put in place, with all joints butted tight. To the top surface<br />

of the <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> shall then be applied a 1-inch thick Portland<br />

cement finish, mixed in the proporti<strong>on</strong> of <strong>on</strong>e part Portland<br />

cement to two parts clean, sharp sand.<br />

To the under side of the first course, a sec<strong>on</strong>d layer of<br />

. . .-inch pure <strong>cork</strong>board shall be erected in a ^-inch bedding<br />

of Portland cement mortar, additi<strong>on</strong>ally secured to the first<br />

with galvanized wire nails, all joints in the sec<strong>on</strong>d course<br />

broken with respect to all joints in the first course and all<br />

joints butted tight. To the surface of the <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> under-<br />

neath shall then be applied a finish as selected.<br />

1 07 .<br />

—<br />

Ceilings.—Wood.<br />

(15) Single layer, in Asphalt cement.<br />

To the reas<strong>on</strong>ably smooth and clean ceiling surface to be<br />

insulated (c<strong>on</strong>sisting of J^-inch T. & G. sheathing to joists),<br />

<strong>on</strong>e layer of . . .-inch pure <strong>cork</strong>board shall be erected in hot<br />

*About 10 feet is the maximum width that may be spanned safely by T-ir<strong>on</strong>s carrying<br />

double layer of <strong>cork</strong>board, and following this specificati<strong>on</strong>. It is not perrnissable<br />

to double the span and center-support the T-ir<strong>on</strong>s by rods fastened to ceiling<br />

of buildino; above ; because water will be c<strong>on</strong>densed <strong>on</strong> the cool surfaces of these rods<br />

and will follow through into ceilini? <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> below, tending to destroy it or otherwise<br />

make it unfit for service within a year.

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