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1950-51 Theatre Catalog, 9th Edition, Page 112 (92)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 112
Page 112

1950-51 Theatre Catalog, 9th Edition, Page 112

INTERIOR CEILING DECOR can vary with the decorative plan. TOP: The diamond shaped outlines have been painted in one solid color. CENTER: Stenciled ornamentation has been framed mto each diamond.

BOTTOM: Plastered walls and plaster fin

ished arches stenciled into the room's decorative ornamentation.

type joints remained tight in tension, and any cross-grain shrinkage was taken up by slight rotation within the joint. Negligible shortening of the roof arch was anticipated through an initial camber during erection.

Fire-Resisting Qualities

A widespread fallacy lies in the belief that steel is absolutely fireproof, while wood is not. Although it is true that steel is incombustible, it is not fire-resistant, unless all surfaces are protected by fireproofing materials which are capable of insulating it against fire temperatures. If such protection is not provided, steel framing members in compression will collapse under relatively low fire temperatures.

Wood lamella roofs, on the other hand eusing two-inch lamellas for spans up to 67 to 100 feet, in accordance with roofloading conditionsecarry the same fire insurance rates as those for similar roofs supported by unprotected steel trusses. By the very nature of its construction, which eliminates vertical supporting members and is arched high above the floor, the lamella roof escapes early dam< age by fire. Furthermore, as an added safety feature, a good-sized hole may be burned through the network, sheathing, and rooting at any point without causing the entire roof structure to collapse, for loads automatically redistribute themselves to less damaged timbers near the burned-out section.

In addition, the panels formed by the lamellas provide formidable firestops and will halt the rapid spread of fire by the roof structure itself. Since a rather lengthy period of time will elapse before charring of timbers materially weakens a lamella roof structure, any fire can usually be put out long before serious damage is done or the danger of collapse becomes imminent. Lastly, further fire insurance benefits, in addition to those afforded by the slow-burning lamella roof type construction, can be secured by chemical fireproofing of the original lamella lumber, or by installation of a sprinkling system for the roof area which can be set up conveniently and effectively with maximum sprinkler head spacing used.

Earthquake Safety Features Although a relatively small portion of the total earthls surface is subject to earthquake tremors, the lamella roof is a priceless safeguard against serious damage to human life and property in areas where such catastrophes do strike from time to time. If, for example, an earthquake should occur in the vicinity

FIG. 6. Elevation and section of Lamella ioinl showing application oi panel insulation and placing of electrical conduit.

1950-51 Theatre Catalog, 9th Edition, Page 112