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1950-51 Theatre Catalog, 9th Edition, Page 142 (122)

1950-51 Theatre Catalog, 9th Edition
1950-51 Theatre Catalog
1950-51 Theatre Catalog, 9th Edition, Page 142
Page 142

1950-51 Theatre Catalog, 9th Edition, Page 142

Table II SOUND ABSORPTION COEFFICIENTS (Acoustical Materials Assln Data) Wt.


Thick- Mount- Red. Size per Test ness ing 128 256 512 102420484096Coef. Tested Sq. No.


3/4" 1 .02 .16 .76 .99 .63 .44 .65 12"x12" .71 A48-104

Mounting #l-Adhesive Application. Mounting #7eMechanical Application. Oliicial AMA data-1949 Acoustical Materials Association Bulletin, No. XI.

THE MECHANICAL APPLICATION of Fiberglas acoustical tiles is slightly more technical. Figures Nos. 1 to 5 below. illustrate the use of the recommended Securitee-Standard System. with details of the simple

suspended type and the iurred construction type. Figure 6 is the Securitee-Limited System.

r a nu:

\ S ' i


wt. k\\\\ w. \&atx\\\u$km5 as s\\\\s\\ WWMWWVAYM Him m V r

A" 7 .16 .47 .98 .83 .64 .46 .75 12"x24" .68 A48-105

Fiberglas products primarly designed for thermal insulation purposes are now widely used for acoustical purposes in theatres and theatre-type applications requiring fire-safe, high sound-absorption materials at low cost, where appearance is not a primary factor or where the material is wholly or partially concealed. There will undoubtedly continue to be many such applications to .which Fiberglas products will be well adapted.

An incombustible acoustical ceiling of Fiberglas PF thermal insulation board, supported by aluminum extruded 0T" sections, is one of the new features used in the recently constructed Brooks Recreation Center, Raleigh, N.C. The building, which is the largest of its kind between the District of Columbia and Florida, is of steel and masonry construction with a glass and aluminum front. There are now 24 bowling alleys in operation, and there is room for six more. Opposite the alleys there is a roller skating rink with sufficient room for 1,000 skaters.

From the overhead roof structural members, the contractor dropped 14gauge wire of proper lengths. The wires were inserted and tied through holes which were hand-punched at intervals in the stems of the extruded aluminum itTi, sections. The sections were hung in one direction only, 24 inches on center, and laterally braced with spacer bars. The PF board was spray painted and then laid on the flanges of the suspended ltTis" to form the ceiling proper. The unsanded, painted board presents an unusual and distinctive appearance and provides excellent acoustical properties.

PF board has found widespread use on the West Coast for acoustical treatments

1950-51 Theatre Catalog, 9th Edition, Page 142