- Author
-
National Bureau of Standards
- Title
- Fire-Endurance Tests of Wood-Joisted Floors With Ceilings of Lightweight Plasters on Metal Lath.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
Test 272; Test 281; TR10218-20; FP2984
December 15, 1950
21 p.
- Keywords
-
fire endurance tests
|
wood
|
floors
|
ceilings
|
plaster
- Abstract
- Fire-endurance tests were made of two wood-joisted floors, 13 ft 6 in. wide by 17 ft 4 in. long, Test Nos. 272 and 281. Each had a ceiling of lightweight plasters on metal lath. The tests were made in cooperation with the Metal Lath Manufacturers Association to obtain data from which fire-resistance ratings were derived. The choices of the two types of lightweight plaster aggregates and the thicknesses selected were based on the results of three exploratory tests, Nos. 239, 240, and 241. For test No. 272, the plaster aggregate was vermiculite and for test No. 281, perlite. The plaster on one-half the ceiling of the first was from one manufacturer; that on the other half from another; and the ceiling of the second was covered with a mixture containing equal parts of plasters of the two manufacturers.