Codes and Installation Standards

Codes and Installation Standards
Drywall & ShortSpan Grid Systems
About Codes
• provide guidelines for the design and construction of residential and commercial space
• written and maintained by agencies that have no direct authority for enforcement
• generally revised every three years
• adopted, in full or in part, by municipalities that have enforcement powers
Implementation Standards
• define the materials and techniques to be used in complying to the Model Building Codes
• in some cases may be part of the code itself (UBC and IBC)
• typically referenced in the building specifications or drawings
Always Check with Local Building Codes
• municipalities do not necessarily adopt the latest version of a code
• enforcement authorities decide which portions of a code will be applied
• manufacturers and their agents do not have the authority to interpret codes
• local authorities resolve issues that may arise from conflicting codes
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Drywall Grid System — Code and Installation Standards
Drywall & ShortSpan Grid Systems
ASTM
ASTM
ASTM
ASTM
ICC
IBC
DSA
UL
CISCA
UBC
NOA
2-26
C635
Standard Specification for the Manufacture, Performance, and Testing of Metal
Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings
C636
Standard Practice for Installation of Metal Ceiling Suspension Systems for
Acoustical Tile and Lay-in Panels
C645
Standard Specification for Nonstructural Steel Framing Members
C754
Standard Specification for Installation of Steel Framing Members to Receive
Screw-Attached Gypsum Panel Products
ESR-1289 International Code Council Evaluation Service
International Building Code
RR25348
City of Los Angeles Research Report
PA105
Division of the State Architect (California)
Underwriters Laboratories Inc. Fire Resistance Directory
Ceiling & Interior Systems Construction Association
25-2
Uniform Building Code Standard (section 25.210, exception 2)
04-0716.03 Dade/Broward County, Florida Product Approval
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
The following pages provide some basic handling and installation techniques when
using Armstrong Drywall Grid Systems. For specific component information, refer to
the Drywall Grid System Overview section. For technical information, detail drawings,
CAD design assistance, installation information or other technical services, contact
TechLine at 1 877 ARMSTRONG (276-7876).
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
Hanger Wire Hole
Triple Lock
Main Beam
Splice
Rotary
Stitching
Type “F”
Rout
Hanger Wire Hole
Primary
Rout
Type “F”
Rout
Fire Expansion
Relief Notch
1/4″
13/32″
1-1/2″
Armstrong Drywall Grid System HD8901 15/16″ face main beam features
15/16″
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
Hanger Wire Hole
SuperLock
Main Beam
Clip
Double Row Type “F”
Rotary
Rout
Stitching
Hanger Wire Hole
Primary
Rout
Type “F”
Rout
Fire Expansion
Relief Notch
1/4″
ScrewStop
Reverse Hem
9/16″
1-11/16″
Armstrong Drywall Grid System HD8906 1-1/2″ face main beam features
1-1/2″
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
1/4″
9/16″
1-11/16″
15/16″
XL2 Staked-on
clip
Double row
Rotary
Stitching
ScrewStop
Reverse Hem
(1-1/2” face only)
1/4″
9/16″
1-1/2″
Armstrong Drywall Grid System cross tee features
1-1/2″
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
HD8901 and HD8906 Rout Spacing
1-3/4"
Type “F”
Rout
Primary
Rout
Type “F”
Rout
Type “F”
Rout
Primary
Rout
Type “F”
Rout
8"
on center
NOTE: Refer to rout location drawings for full range of main beam
and cross tee rout locations. (pages 2-9 through 2-12)
Additional Routs on main beam and cross tees for type “F” fixture installation
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
HD8906F08 Knockout Locations
Knockout
8″ on center
NOTE: Refer to rout location drawings for full range of main beam
and cross tee rout locations. (pages 2-9 through 2-12)
Faceted Main Beam HD8906F08 knockout spacing
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
HD8906F16 Knockout Locations
Knockout
16″ on center
NOTE: First knockout starts 4″ from one end.
NOTE: Refer to rout location drawings for full range of main beam
and cross tee rout locations. (pages 2-9 through 2-12)
Faceted Main Beam HD8906F16 knockout spacing (Directional Main Beam)
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
Channel or
Angle Molding
Drywall
Main Beam
Cross Tee
Drywall Grid System typical installation
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Basic Drywall Grid Installation
Drywall & ShortSpan Grid Systems
Main Beam
Cross Tee
NOTE: Class A non-rated installation.
For Fire Resistive installations follow
specific UL design requirements.
Gypsum
Board
Drywall Grid System
Gypsum board attaches to cross tees only (allows for 48″ or 50″ main beam spacing)
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How to Secure a Single Cross Tee
Drywall & ShortSpan Grid Systems
OPTION A
Split the clip through the rout
and bend
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OPTION B
Cut off cross tee end detail and
screw through both flanges
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Typical Drywall Installation
Drywall & ShortSpan Grid Systems
Main Beams can be installed
50″ on center using 50″ cross
tee (XL8947P) for type “F”
fixture placement either
perpendicular or parallel to
the main beam
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Wire Loading
Drywall & ShortSpan Grid Systems
9 Gauge Wire Breaking Strength
and Technical Data
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12 Gauge Wire Breaking Strength
and Technical Data
9 Gauge Wire
12 Gauge Wire
Diameter .148”
Galvanized Steel
Diameter .105”
Galvanized Steel
740 lbs.
Breaking Point
375 lbs.
Breaking Point
3 Turns in 3”
Per ASTM C 636
3 Turns in 3”
Per ASTM C 636
500 lbs. Pullout –
Hanger Wire Hole
500 lbs. Pullout –
Hanger Wire Hole
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Yoke Wire Hung Ceilings
Drywall & ShortSpan Grid Systems
Another method to install hanger wires around an object in the plenum is to utilize
a single or double yoke wire technique.
Rule: to form the 45 degree angle, the vertical location of the tension ring is always
half the distance of the span at the structure.
Single Yoke
45˚
5/8” Type USS
Flat Washer
or Equivalent
5/8” Type USS
Flat Washer
or Equivalent
NOTE: Maintain wire spacing at a maximum 4′ on center.
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Yoke Wire Hung Ceilings
Drywall & ShortSpan Grid Systems
Double Yoke
45 Max.
5/8” Type USS
Flat Washer
or Equivalent
NOTE: Maintain wire spacing at a
maximum 4′ on center.
Gypsum Wall Board
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Trapeze Supported Loads
Installing a trapeze is a technique to support multiple hanger wires under obstructions, such as trunk
lines, cable trays or other objects in the plenum. In some cases the trapeze may effect the ceiling height
and must be kept small. In other cases steel studs may be used to span the distance required.
Drywall & ShortSpan Grid Systems
Cable Trays
Elec. Conduit/Water Lines
HVAC DUCT
Duct
Strap
Telephone Lines
Acoustical or Drywall Ceilings
Hanger Wire
Trapeze Support Independent of Equipment
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Main Beam
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4‘ O. C.
Max.
Trapeze Loading per ASTM C 636
Drywall & ShortSpan Grid Systems
Members
1-1/2n
Gauge
0′ - 4′
4′ - 8′
8′ - 12′
12′ - 16′
16′ - 20′
16
1-1/2″ CRC
NA
NA
NA
NA
P-2000
NA
CRC
16
1-5/8n
Unistrut
14
P-1100
12
P-1000
20
6CSJ-20
Bridge Mid
18
6n
Steel Stud
NA
NA
6CSJ-18
Bridge Mid
NA
16
6CSJ-16
Bridge Mid
NOTE: Bridging is required at mid span when steel stud members are greater than 8′- 0″ in length. Bridging may be 1-1/2″ CRC or
main runner screw attached to hold vertical and prevent cocking. No wire is required at mid span.
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