Ceiling Fastening Systems
Ceiling Fastening Systems Selection and Design 3.3.1
3.3.1.1 Ceiling Fastening Systems Selection
The following sections describe suspended ceiling system
attachment solutions for lay-in panel or acoustical suspended
ceilings. These solutions consist of powder-actuated and
mechanical fasteners that provide the installer with highly
productive, high quality solutions designed to fit the needs of
the particular application.
The primary criterion when determining which solution to
choose will depend on the base material. The innovative Hilti
X-CW and X-CC powder-actuated fastening systems are
intended for use in concrete and concrete over metal deck
base materials. The X-CC ceiling clip assembly may also be
used in steel base materials. The eye-lag ceiling fastening
system is a solution for wood and thin gauge cold-formed steel
base materials.
X-CW Ceiling Wire Assembly
The innovative X-CW ceiling wire assembly contains a powderactuated fastener and integrated steel wire with clamping
washer which eliminates the need for wire wrapping. The
X-CW fastening system is installed with Hilti DX-351-CT
Powder-Actuated Tool and adjusted for the height of the
ceiling system. The X-CC ceiling clip assemblies consist of a
sheet steel clip with a pre-mounted powder-actuated fastener
and may be ordered with or without pre-tied 12 gauge wires
of different lengths. The eye-lag ceiling fastening system is an
efficient solution for supporting direct or indirect hung lay-in
panel suspended ceiling systems from wood and steel deck
base materials.
X-CC Ceiling Clip Assembly
Eye-Lag Fastening System
Hilti Ceiling Attachment System Product Selection Guide
Ceiling Fastening
System
X-CW
X-CC
Eye-Lag Screw
Applicable Base
Material
Concrete,
Lightweight Concrete
over Metal Deck
Concrete,
Lightweight Concrete
over Metal Deck,
Steel
Wood, Sheet Steel
Fastener Types
Recommended
Installation Tools
Wire Type
Section
X-C27, X-C32,
X-U22, X-U27
DX 351-CT
with Pole Tool
Integrated
12 Gauge Wire1
3.3.2
X-C27, X-C32,
X-U22, X-U27,
X-AL-H22, X-AL-H27
DX 351
with Pole Tool
Pre-tied to ceiling clip
or provided by others
3.3.3
EL WS, EL S, EL SD
Telescopic Screw
Ceiling Tool
Provided by others
3.3.4
1 ASTM A641 wire available with Class 1 or regular coating.
Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I Direct Fastening Technical Guide 2015 73
Ceiling Fastening Systems
3.3.1 Ceiling Fastening Systems Selection and Design
3.3.1.2 Ceiling Fastening Systems Design
Figures 1 and 2 illustrate the installation
of a suspended ceiling system as
described in ASTM C635. The ceiling
systems shown are composed of
ceiling panels which are supported by
a suspension system of main runners,
cross runners and wall moulding for
direct hung ceiling systems. Carrying
channels are part of indirect hung ceiling
systems where the main runners are
attached to carrying channels which are
attached to concrete using Hilti ceiling
fastening systems.
The entirety of the suspended ceiling
system depends on the Hilti ceiling
fastening hangers which support the
suspension system main load carrying
members. The spacing between ceiling
fasteners must be determined by the
design architect or engineer of record
based on the loads and building code
requirements or as recommended by
ceiling manufacturer (e.g. Armstrong/
WAVE). Hanger wires must be
wrapped by the installer to the specific
requirements at the point of installation
to the main runner or channel members
as shown in the figures below.
The wires must be wrapped in a similar
fashion at the wire hole for the X-CC
ceiling clip assemblies. The innovative
X-CW ceiling wire assemblies do not
require wire wraps as the integrated
ceiling wire and clamping washer is premounted to the head of the fastener.
Hilti ceiling fastening systems should
not be used for anchorage of seismic
bracing channels and compression
struts. Hilti recommends the use of ICCES AC193 qualified mechanical anchors,
such as Hilti KB-TZ, for attachment of
bracing for suspended ceiling systems.
Reference Section 2.4 for more
discussion on seismic considerations.
Hilti Ceiling
Attachment System
Support Clip
for Main Runners
Wall Moulding
Carrying Channel
Acoustical Tile
Cross Runners
Figure 1: Indirect Hung Ceiling system
(reference ASTM C635)
Spline
(Spanning
Cross Runners)
12 ga.
wire typ.
Hilti Ceiling
Attachment System
Main Runners
3 tight turns
in 1-1/2"
Carry Channel or Main
Runner typ.
Acoustical
Lay-in Panels
Cross Runners
(Spanning
Main Runners)
Wall Moulding
Main Runners
Figure 2: Direct Hung Ceiling System
(reference ASTM C635)
74 Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I Direct Fastening Technical Guide 2015
Ceiling Fastening Systems
Ceiling Fastening Systems Selection and Design 3.3.1
3.3.1.3 Ceiling Fastener Locations when Installing
into Lightweight Concrete over Metal Deck
Hilti Ceiling Fastening System
3000 psi Lightweight Concrete
12"
min. 3-1/4"
3"
3-7/8" min.
Form Deck
Lower Flute Location
Upper Flute Location
Direction
of combined 1-1/8"
load on
Min. Edge
fastener
Distance
(Typical)
Direction
of tension
load on
fastener
(Typical)
3-7/8" min.
7-1/4" min.
Figure 3: Hilti Ceiling Fastening System Location in 3-in.-Deep Composite Floor Deck, Normal Deck Profile Orientation
Hilti Ceiling Fastening System
6"
3000 psi Lightweight Concrete
min. 2-1/2"
1-3/4"
Form Deck
Upper Flute Location
Lower Flute Location
Direction
of combined
load on
fastener
(Typical)
Direction
of tension
7/8"
load on
Min. Edge fastener
Distance (Typical)
1-1/2"
2-1/2"
3-1/2"
Figure 4: Hilti Ceiling Fastening System Location in 1-1/2-in.-Deep Composite Floor Deck, Normal Deck Profile Orientation
Hilti Ceiling Fastening System
6"
3000 psi Lightweight Concrete
Form Deck
Upper Flute Location
Lower Flute Location
Direction
of combined
load on
fastener
(Typical)
Direction
1-3/4" of tension
Min. Edge load on
Distance fastener
(Typical)
min. 2-1/2"
1-3/4"
1-1/2"
3-1/2"
Figure 5: Hilti Ceiling Fastening System Location in 1-1/2-in.-Deep Composite Floor Deck, Inverted Deck Profile Orientation
Hilti, Inc. (US) 1-800-879-8000 | www.us.hilti.com I en español 1-800-879-5000 I Hilti (Canada) Corp. 1-800-363-4458 I www.hilti.ca I Direct Fastening Technical Guide 2015 75