National Gypsum Construction Guide - 12th Edition

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 attempted to 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 and accessibility 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 CSI three-part format and
CSI page format. Additional specification options are provided in
Masterspec and Manu-Spec.
SUB-SECTION HEADING
Each product in the section will be
designated with a sub-section
heading on the appropriate pages.
COLOR ARROW HEAD
Indicates next topic
for a product, i.e.
Description,
Technical Data,
Details,
Specifications,
Recommendations,
Installation.
®
PAGE NUMBER
National Gypsum Company Headquarters
2001 Rexford Road
Charlotte, North Carolina 28211
(704) 365-7300
Internet - www.nationalgypsum.com
COPYRIGHT 2008 NATIONAL GYPSUM COMPANY
Suspended Metal Lath Ceilings
DESCRIPTION
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 tied every 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
TECHNICAL DATA
SIZE AND SPACING OF CHANNEL FOR SUSPENDED CEILINGS
Center to Main Channel
Center Spacing Size of (weight Maximum
of Hangers Cold Rolled per 1000 ft.) Center to Center
Along Channel Channel (305 M) Spacing of Channel
up to 3' 1 1/2" 475 lbs. 4'
(914 mm) (38.1 mm) (216 kg) (1219 mm)
up to 3'6" 1 1/2" 475 lbs. 3'6"
(1067 mm) (38.1 mm) (216 kg) (1067 mm)
up to 4' 1 1/2" 475 lbs. 3'
(1219 mm) (38.1 mm) (216 kg) (914 mm)
DETAILS
3/4" C.R.
CHANNEL
HANGER WIRE
1 1/2" C.R.
CHANNEL
TIE WIRE
GYPSUM PLASTER
66 CASING BEAD
FLEXIBLE DUST SEAL
FINISHED WALL LINE
SUSPENDED METAL LATH AT WALL (UNRESTRAINED)
09210K
Scale: 3" = 1'-0"
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 be
installed 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.
40 NATIONAL GYPSUM CONVENTIONAL PLASTER SYSTEMS
SIZE AND SPACING OF CHANNEL FOR FURRED
AND SUSPENDED CEILINGS
3/4" (19.0 mm) C.R. Channel Maximum
Center to Center Cross Furring 300 lbs. Furring
Spacing of Hangers (136 kg)/1000 ft. (305 M) Spacing
up to 3' (914 mm) 3/8" (9.5 mm) rib lath 24" (610 mm)
up to 3' (914 mm) 3.4 lb. (1.5 kg) flat rib lath 19" (483 mm)
up to 3'6" (1067 mm) 3.4 lb. (1.5 kg) mesh lath 16" (406 mm)
up to 4' (1219 mm) 2.5 lb. (1.1 kg) mesh lath 12" (305 mm)
MAXIMUM SPACING OF SUPPORTS FOR METAL LATH
Type of Lath
Support
Spacing
Weight of Lath
lbs. per sq. yd. (kg/m2 Diamond Mesh
)
(flat expanded) 16" (406 mm) 3.4 (1.9)
Flat Rib 16" (406 mm) 2.75 (1.5)
19" (483 mm) 3.4 (1.9)
3/8" (9.5 mm) Rib 24" (610 mm) 3.4 (1.9)
1 1/2" C.R.
CHANNEL
1 1/2" C.R.
CHANNEL
HANGER WIRE
3/4" C.R.
CHANNEL
GYPSUM
PLASTER
66 CASING BEAD
METAL LATH
METAL LATH
NO. 15
EXPANSION JOINT
LIGHTING TROFFER
SUSPENDED METAL LATH CONTROL JOINT
09210O
09210M
Scale: 1 1/2" = 1'-0"
Scale: 3" = 1'-0"
SUB-SECTION NAME
Repeats the name of the
current sub-section.
TRADEMARKS
The following names are trademarks owned by National
Gypsum Company or its subsidiary, National Gypsum
Properties, LLC:
DURABASE ®
DURASAN ®
EASY FINISH ®
EDGE GRIP TM
EXCELLENCE ACROSS
THE BOARD ®
e 2 XP
E-Z STRIP ®
FIRE-SHIELD ®
FIRE-SHIELD C TM
GOLD BOND ®
GOLD BOND 54 ®
GRIDMARX ®
GRIDSTONE ®
GYPSOLITE ®
HIGH FLEX ®
HI-ABUSE ®
HI-IMPACT ®
KAL-KORE ®
KAL-KORNER BEAD ®
CAD DRAWING FILE
NUMBER
KAL-KOTE ®
KAL-MESH ®
MULTI-FLEX ®
NGC ®
1-800 NATIONAL ®
PERFECT SPRAY ®
PERMABASE ®
PERMABASE FLEX ®
PROFORM ®
SEASPRAY MVR ®
SHAFTLINER ®
SHAFTLINER XP ®
SOUNDBREAK
STA-SMOOTH ®
TRIPLE-T ®
ULTRA TM
UNI-KAL ®
X-KALIBUR ®
XP ®
GRAPHICS, ILLUSTRATIONS AND
PHOTOGRAPHY
Each product grouping is
full of informative graphics and
photography as a visual aid in
identifying products, uses and
installation.
CAD DRAWINGS
These drawings are included where
appropriate to assist architects and
specifiers with detailed drawings.