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9 TH EDITION

National Gypsum Construction Guide

09250/NGC BUYLINE 1100

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HOW TO USE THE NATIONAL GYPSUM COMPANY GYPSUM CONSTRUCTION GUIDE
NATIONAL GYPSUM PRODUCTS FOR ALL YOUR BUILDING NEEDS Your National Gypsum Company “Gypsum Construction Guide” has been carefully developed to provide you with a comprehensive guide to the entire range of National Gypsum products. We have attemptedto give you the most accurate, up-to-date information in a clear, concise, easy-to-read format. Because it is important for us to ensure our guide is user-friendly, we welcome your comments. Please write us at: National Gypsum Company Technical Services Department, 2001 Rexford Road, Charlotte, N.C. 28211 or call 1-800-NATIONAL (1-800-628-4662) U.S.A. or Canada. For your easy reference andaccessibility to this information, we have placed all of our Sweet’s material in this section. For a complete copy of our literature call 1-800-NATIONAL. CAD DRAWINGS AND SPECIFICATIONS To assist you in your design process, all CAD drawings and specifications are available at www.nationalgypsum.com. Computer aided design (CAD) drawings are in DXF, DWG and GIF file formats. Specifications are in CSIthree-part format and CSI page format. Additional specification options are provided in Masterspec and Manu-Spec.

TRADEMARKS
The following names are trademarks owned by National Gypsum Company or its subsidiary, National Gypsum Properties, LLC: DURABASE® DURASAN® EASY FINISH® EDGE GRIPTM E-Z S TRIP® FIRE-SHIELD® FIRE-SHIELD CTM GOLD BOND® GRIDMARXTM GRIDSTONE® GYPSOLITE® HIGH FLEX® HI-ABUSE®HI-IMPACT® KAL-KORE® KAL-KORNER BEAD® KAL-KOTE® KAL-MESH® LITETM MR® MULTI-FLEX® NATIONAL GYPSUM LOGO PERFECT SPRAY® PERMABASE® PERMABASE FLEX® PROFORM® SEASPRAY® SHAFTLINER XPTM SPRAY QUICKTM STA-SMOOTH® TRIPLE-T® ULTRATM UNI-KAL® X-KALIBUR® XP®

SUB-SECTION HEADING Each product in the section will be designated with a sub-section heading on the appropriate pages.

Suspended Metal Lath CeilingsDESCRIPTION
Metal lath suspensions are commonly made below virtually all types of construction for fire-rated and non fire-rated plaster ceilings. Framing of 1 1/2" C.R. channels are spaced up to 4' o.c. perpendicular to joists and are crossfurred with 3/4" C.R. channels spaced according to specifications for types and weight of metal lath. Lath is then properly lapped at sides and ends and tiedevery 6" to the 3/4" channel. Where it is advisable to install unrestrained ceilings, having perimeters separated from adjacent walls or partitions, galvanized casing beads should be installed around the periphery. Metal Lath is frequently used for furred as well as suspended ceilings. Metal lath is used for furring from wood, concrete and steel joists. RECOMMENDATIONS 1. Control joints should beinstalled in ceilings without perimeter relief with a maximum distance between such joints of 30' with a maximum undivided area of 900 sq. ft. With perimeter relief, maximum distance is 50' with maximum undivided area of 2500 sq.ft. 2. Use three-coat plastering on metal lath.

COLOR ARROW HEAD Indicates next topic for a product, i.e. Description, Technical Data, Details, Specifications,Recommendations, Installation.

GRAPHICS, ILLUSTRATIONS AND PHOTOGRAPHY Each product grouping is full of informative graphics and photography as a visual aid in identifying products, uses and installation.

TECHNICAL DATA
SIZE AND SPACING OF CHANNEL FOR SUSPENDED CEILINGS Center to Center Spacing of Hangers Along Channel up to 3' (914 mm) up to 3'6" (1067 mm) up to 4' (1219 mm) Main Channel Size of(weight Maximum Cold Rolled per 1000 ft.) Center to Center Channel (305 M) Spacing of Channel 1 1/2" (38.1 mm) 1 1/2" (38.1 mm) 1 1/2" (38.1 mm) 475 lbs. (216 kg) 475 lbs. (216 kg) 475 lbs. (216 kg) 4' (1219 mm) 3'6" (1067 mm) 3' (914 mm) SIZE AND SPACING OF CHANNEL FOR FURRED AND SUSPENDED CEILINGS Center to Center Spacing of Hangers up to 3' (914 mm) up to 3' (914 mm) up to 3'6" (1067 mm) up to...