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RESISTANCE.TINGS e e IISTANCE FIRE RATINGS FIRE COL UMN PROTECTIONS-Continued Resistance Based on Standard Fire WALLS AND PARTITIONS-Continued Tests Ratings Fire . Minimum Thicknessl Inches for Rating of - - 4 hrs. 2 hra. Protection of Details Type hr. 3 hrl!. trap steel Concrete. coarse aggregate rock; fill of same material wire tiesP. (9, 26) or Steel Columns 6x6in.or largerm 1 1 1 l}~ 2 I~ 1 2~ 2 I~ .1 in. in. or 12 in. or Concrete, coarse aggregate granite, sandstone, siliceousK gravel or cin- derso; fill of same material; steel wire ties''''. (95) 6 x 6 in. or larger. larger...,..........,.....,...._, 6x6 8x8 12 x larger larger, 1 1 1 I~ 1 1 2 2 1 3 2~ 2 8 x 8 in. or larger. 12 x 12 in. or larger, ., ~.; I t, I I; It I " I I. .; " .1 I I; l . I' ,I !! .t 1 " . Estimated Ratings Members Framed in Wall: None or N oncombustibli:f Minimum Equivalent Thickness. Inches. for Ratings of hrs. 2 hrs. Construction Details of Type hr. 3 4 hrs. slag. or expanded Coarse aggregate, pumice. (43) .,. Coarse aggregate. shale. ( 43) Concrete Masonry Units 2.1 3.2 4.0 4.7 2.6 2.7 3.fs 4.0 4.8 5.0 5.7 5.9 clay or cinders expanded Coarse aggregate. limestone. or unexpanded slag. (43).. aggregate. calcareous 2.8 4.2 5.3 6.2 gravel gravel siliceous aggregate. Coarse (43) Coarse (43) 3.0 4.5 5.7 6.7 Minimum Thiclmessb. Inches for Ratings of 4 hrs. 3 hrs. 2 hrs. hr. Rating Protection in. concrete block. hollow, cinder; fill of cinder con- crete slabs and mortar with I ~ in. mortar between column and blocksr. (29) of Details 3 Type Steel Columns 'I i :1 i " Construction of Details Type 4 hrs. 4 in. gypsum block, solid; corrugated metal ties or ~ in. metal mesh in horizontal joints; gypsum block or poured gypsum fill; ~ ill. gypsum mortar between column and block. (26) , . 'WI 4. 5~ 6~ 7~ 33) (11. Solid walls. Plain Concrete hrs. 4 2 in. gypsum concrete, poured; fill of same material; 4 x 4 in. wire mesh reinforcement wrapped around columnt. (28) 3~ 5 6' 6~ Solid walls. unplastered: Group 1 Aggregatesk, ~ in, maxi- mum size. (11) "".,........".......",.',.,. Group 2 Ag~regatesk. ~ in. maxi- mum size. (11. 33) Reinforced Concrete 4 hrs. in. gypsum block. solid; plastered with ~ in. gypsum and sand plaster; ~ in. 12 gauge metal cramps set in holes drilled in blocks to link adjacent blocks of the same course together; no fill. (28) 2 4 hrs. 2 in. gypsum block. solid; wire lath strips laid in hori- zontal joints; fill of gypsum block and mortar with ~ in. mortar between column and blocks and with ~ in. gypsum and sand plaster on outside. (28).. 4 hrs. 3 in. gypsum block, hollow; covered with ~ in. gypsum and sand plaster; ~ in. 12 gauge metal cramps linking adjacent blocks of same course; ~ in. mortar between column flange and block; no fill. (28) ........ 4 hrs. 4 in. hollow clay tile. two 2 in. layers; ~ in. mortar between tile and column; ~ in. metal mesh in hori- zontal joints;, hollow clay tile fill. (26) I i ~. 'f l. [ I l Solid walls plastered each side with ~ in. portland cement stucco or portland cement or gypsum plaster: Group 1 Aggregatesk. ~ in. maxi- mum size. (11) .....,... Group 2 Aggregatesk. mum size. ( 11 ) 4. 5~ 6~ 7~ 3. 3. 4 5 maxi- in. ~ 3. 4 5 6 Stone Masonry 8 12 thickness. 12 12 Solid wall 4 hrs. 2 in. hollow clay tile plastered with ~ in. 1:3 (by volume) gypsum and sand plaster; ~ in. mortar be- tween tile and column; ~ in. metal mesh in hori- zontal joints; limestone concrete fill. (26).... See note . for definition of equivalent page 47. Letter superscripts refer to notes, · Nonbearing. 4 hrs. page 47. to, notes. Letter superscripts refer 11 . e 46