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1947-48 Theatre Catalog, 6th Edition, Page 183 (171)

1947-48 Theatre Catalog, 6th Edition
1947-48 Theatre Catalog
1947-48 Theatre Catalog, 6th Edition, Page 183
Page 183


1947-48 Theatre Catalog, 6th Edition, Page 183

expanded mine and plant production and overcome many adverse conditions which have caused vermiculite materials to be in short supply. Output of the principal mine in this country, located at Libby, Montana, and operated by the Universal Zonolite Insulation Company, has been more than doubled. In South Carolina, a large area has been given over to mining vermiculite for distribution principally to the southeast. New expanding plants have been established in Albany, New York; Dearborn, Michigan; Chicago, Illinois, and Minot, North Dakota. In all, there are over twenty-five owned and licensed Zonolite brand vermiculite processing plants in this country.

Of principal interest to theatre owners is vermiculite's extreme light weight. Weighing only 6 to 8 pounds to the cubic foot, depending on the grade, vermiculite in its various finished product forms is capable of reducing many tons of dead load in theatre structures. Weightsaving invariably results in lower costs, because of reduced handling and the elimination of costly construction techniques. This fact alone would invite consideration of vermiculite where new buildings or remodelling is contemplated.

INSULATING PLASTER

Perhaps the most quickly evident saving in installation time because of the light-weight characteristics of vermiculite is where the material is used in the making of a fire-proof, insulating plaster. Plaster aggregate made from vermiculite replaces sand, and is mixed with gypsum and troweled on in the same fashion as sand plaster. In many communities, vermiculite has completely replaced sand and is adopted as standard. Vermiculite plaster offers a definite superiority over sand in its sounddeadening and fireproofmg qualities.

Weight-saving is especially notable Where vermiculite plaster is used to provide fire-proofing of beams, columns, floors, and ceilings. Table 1 shows the resume of fire tests which have been conducted utilizing vermiculite for this purpose.

INSULATING CONCRETE

An equally important adaptation of vermiculite is in'its use for the manu TABLE 2-Properties of various mixes (by volume) of Zonolite insulating concrete, including strength in pounds to the square inch and thermal conductivity, and the materials



Mix by volume







Denshy Cu.". inlbL . bit a Zonolite Per w paragid Stabililed Gallons foo, cement concrete water clSigregate

Whit mix ordinarin used Ior structural root decks.

1947-48 THEATRE CATALOG



TABLE 1-Summary of fire tests on walls, columns and beams, and floors and ceilings incorporating vermiculite. (From the Vermiculite Research Institutes m[he Contribution of Vermiculite to Fire Protective Construction?)



- c onsmucnou

.i'. ,.i'.-.'.



DESCRIPTION RATING AUTHORITY



steel Plate Floor Assembly 2"vermicnlite concrete topping. Suspended ceiling l'vermiculite plaster on metal lath.

Underwriters ' lab. Rot . #27734] 12 [Am









Suspended ceiling of 1 inch vermiculite plaster on metal lath as protection for steel construction. Incombustible construction above ceiling.

Underwriters ' Lab.

4 hra 1m . t2773-1 [20/107

Steel Plate Floors

2*" sand concrete topping. Ceiling of 5 " vermiculite

pllater on mac-1 llth. U. S. Bu'eau of Standards

)MS92 Table Mb

CEILINGS

As above, except i inch vermiculite plaster.





and

Minimum of 2" cinder concrete fill. Suspended ceiling of 7/8 inch vermiculite

plaster on metal lath.



Underwriters ' Lab. Ret. #2669-12/18/39





Minimum of 2" send concrete fill. Suspended ceiling l" vermiculite plaster on metal lath. Dist. x : a" or more

FLOORS

U. 5. Bureau of Standards EMS92 Table 1&5







Cellular Steel Floors

Same as above except distance x, 9" or more.



2"'sand concrete fill

%" vermiculite plaster on metal lath.

2Q" .snnd concrete rill

&" vermiculite plaster on metal lath.



U.s.3ureau of Standards EMS92 - Table #3

True average thickness of the concrete {ill 1 inch greater than shown due to sag in forms.



5 hrs

N

a.

IIIIIII a e

Steel Jols t. Floors



2*" hand concrete fill p

ll" vermiculite plaster on metal lath.

Steel "IF Beam supporting

floor. Undervrltera' Lab.

2"vermic'ilite concrete fill. Fat.1t2773-9/12/lu+

Suspended protection of l" vermiculite plaster on metal lath.

E

Steel "I" Beam Protection

Suspended protection of l" vermiculite plaster on metal lath. Incombu2tible construction above ceiling.

Underwriters ' Lab.

4 *1" Hot. #2773-1/20/uv

Column protected with l" vermiculite plaster on metal lath. Leth spaced 1} inch from column. Space behind lath on flange faces filled with plaster as shown.

COLUMNS AND BEAMS

Undervritera ' Lab. Ret . #2851-1/7/I47

Load bearing Iood stud partition. metal lath Iith 3/4 inch vermiculite plaster

both sides .

underwriters Lab . Est . t2'n3-3/31/m

WMJS

Beam

required for one cubic yard of placed Zonolite water-repellent concrete. (From tlZonolite Concretei, published by the Universal Zonolite Insulation Company.)





Materials required for one cu. yd. of placed

Strength in pounds Zonolite water repellent concrete

per square inch



Thermal



































ConduchHy (ilK"l in B.t.u. ' Compressive Indentation per inch thick- Bugs 2(53'v.:1.0"t'.e 1 th 1" ss 5 . ft. arena"): 5 all": on "liarl liftinnizer portland Stabilized Gallons 6 l-XJ2 3" x 12" x 12" degree' F. Cement concrete WOlEf (y m ers siub aggregme







1.07 9 0.79 6.75 0.69 5 4 0.65 4.5 0.62 3.9 0.60 3.4 0.59 3.0 0.57 2.7 0.56 2.5 0.55 2.3 0.48 1.9 0.46 1.7

lThis mix ordinarily used for insulating roof fill.
1947-48 Theatre Catalog, 6th Edition, Page 183