| Specifications
notes to architect
1. GRIP STRUT Safety Gratings are intended for general purpose use in plants and
process facilities by industry, commerce, and public utilities, and on air, water, and
surface, for both mobile and stationary equipment.
2. GRIP STRUT Safety Grating Stair Treads
are intended for utility stairs and fire escapes in commercial, public and private
buildings where local code permits. They are not intended for staircases used regularly by
the general public where flat closed surfaces are desired.
3. These specifications are presented as a
general guide to the architect or structural engineer in preparing project specifications.
Allowable loads, spans and other limiting conditions presented in this catalog offer
product data for use in design and construction. These products must not be used without
prior structural design by a qualified engineer or architect.
4. All supports should provide a smooth,
level, 11/2" minimum bearing surface, free of burrs, bridging, welds or other
irregularities.
5. Random cut ends and diagonal or circular
cut exposed edges should be banded with a bar at least I/e" thick and equal to the
overall grating thickness welded at contact points at the discretion of the design
engineer.
6. Bolted connections, except stair or ladder
tread attachment to stringer channels, may be replaced by welded connections that develop
the same strength.
7. Miniature "Specifications
Drawings" of GRIP STRUT Grating Products, G-413, and full-scale "Design Drawings
for Stair Systems", G-404, are available, at no cost, for use in design and drawing
preparation. Also available, U.S.G. folder "OSHA Standards for Walking-Working
Surfaces", G-583, to help designers comply with regulations. They are available from
GRIPSTRUT Safety Grating distributors.
Part 1: general
1.1 scope
The contractor shall furnish and install GRIP STRUT Grating and Stair Treads, as
specified, in all areas where shown on the drawings.
1.2 qualifications
All GRIP STRUT Grating, Stair Tread and accessories, unless otherwise -indicated, shall be
manufactured by GS Metals, and shall be installed in accordance with its current printed
directions.
1.3 submittals
The contractor shall furnish shop drawings of grating layout, framing and supports, unit
dimensions and sections, type and location of fasteners and welds.
1.4 storage and handling
All materials shall be stored and handled to avoid damage. Damaged or deteriorated
materials shall be removed from the premises.
Part 2: products
2.1 grating materials
a. Type: (GRIP STRUT Safety Grating) (GRIP STRUT Safety
Grating Walkway) (GRIP STRUT Non-serrated Grating).
b. Metal: (carbon steel) (hot dipped, mill-galvanized
steel) (stainless steel alloy Types 304 and 316L) (aluminum alloy 5052-H32).
c. Finish: (mill-galvanized before fabrication, ASTM
A525) (black, unpainted, oiled) (aluminum mill finish) (stainless steel Type 304-2D
finish) (Stainless steel Type 316L-2B finish).
d. Metal gauge: (14-ga. steel) (12-ga. steel) (16-ga.
stainless steel) (.080" and .100" aluminum).
e. Section width: (43/4") (7") (91/2")
(1 13/4") (1 83/4") (24")
f. Channel height: Safety Grating (11/2")
(2") (21/2") (3"), Walkway Grating-41/2".
g. Standard lengths: 10' and 12' (other lengths to
order).
h. Openings: Openings shall be 17/8" long and
11/16" wide as measured 90' to the side channel.
i. Open area: The entire surface shall
provide at least 36% open area and not more than 45% open area.
j. Reticulated pattern: The reticulated pattern,
approximately 5/16" high, shall contain a minimum of 500 teeth per sq. ft.
k. Slip resistance: The material will conform to
Federal Specification RR-G-1602A for slip resistance.
2.2 stair tread materials
a. Type: (GRIP STRUT Safety Stair Tread) (GRIP STRUT
Stair Tread) (Standard Nosing) (Abrasive Nosing).
b. Metal: (carbon steel) (hot dipped, mill-galvanized
steel) (stainless steel alloy Types 304 and 316L) (aluminum alloy 5052-H32).
c. Finish: (mill-galvanized before fabrication, ASTM
A525) (black, unpainted oiled) (aluminum mill finish) (stainless steel Type 304-2D finish)
(stainless steel Type 316L-2B finish).
d. Gauge: (14-ga. steel) (12-ga. steel) (16-ga.
stainless steel) (.080" and .100" aluminum).
e. Tread depth: (2 dia. 4" wide) (3 dia.
7"wide)(4dia.91/2"wide)(5dia.113/4"wide).
f. Channel height: (11/2") (2").
g. Span or width of staircase: (24") (30-)
(36") (48").
h. Openings: Openings shall be 17/8' long and
"/16" wide as measured 90' to the side channel.
i. Open area: The entire surface shall
provide at least 30% open area and not more than 45% open area.
j. Reticulated pattern: The reticulated pattern,
approximately 5/16" high, shall contain a minimum of 500 teeth per sq. ft.
k. Slip resistance: The material will conform to
Federal Specification RR-G-1602A for slip resistance.
2.3 accessories
a. Anchor and clamp assembly: Catalog Nos. ACA-1 5, 20,
25 and 30. Electro-galvanized with (1 1/2") (2") (21/2") (3") J-bolts,
nuts, washers.
b. GRIP STRUT anchoring device: Catalog No. 12262.
mill-galvanized (use with 5/16" carriage bolts with square shank, nuts, washers
obtained locally).
c. GRIP STRUT splice package: Catalog No. SP-10DU-7
includes: 10 ga. mill-galvanized 7" plate with 7/16" X 11/4" bolts, hex
nuts, washers with recommended use in connecting continuous panels end-to-end only over
supports; Catalog No. SP-10DU-30 includes 12 ga. mill-galvanized 30" C-channel plate
with 1/2" x 11/4' hex head cap screws, washers and hex nuts with recommended use in
connecting continuous panels end-to-end in clear spans.
Part 3: execution
3.1 condition of surfaces
Prior to grating installation, contractor shall inspect supports for correct size, layout
and alignment and verify that surfaces to receive grating are free of debris. The
contractor shall report to the design or consulting engineer or owner's agent in writing
any defects considered detrimental to proper application of grating so defects can be
remedied before grating is applied.
3.2 grating installation
install grating in accordance with manufacturer's recommendations and shop drawings.
Position grating sections flat and square with ends bearing min. 11/2" on supporting
structure. Keep grating sections at least 1/4" away from vertical steel sections and
1/2" from concrete walls. Allow clearance at joints between sections of max.
1/4" at side channels and max. 3/8" at ends. Band random cut ends and diagonal
or circular cut exposed edges with a min. 1/8" thick bar welded at contact points at
the discretion of the design engineer.
Join abutting ends of GRIP STRUT Walkway sections with GRIP
STRUT Splice Packages bolted to outside of side rails or welded as specified.
3.3 grating attachment
Attach grating to supports without warp or deflection as follows:
a. Single plank application-Secure— plank ends
to supporting members at every point of contact. Use two GRIP STRUT Anchoring Devices and
5/16" carriage bolts and nuts at each end or secure both side channels at each end to
supports by fusion welding with 1/8" fillet welds, 1" long.
b. Multiple plank application-Secure —perimeter
plank to supporting members at every point of contact and intermediate grating sections
with at least one attachment each end of plank, on alternate sides. For added rigidity
when span exceeds (6'0') (8'0"), attach side channels of adjacent plank together (at
mid-point of span).
c. Welded attachment-Secure —side channels to
supports by fusion welding with 1/8" fillet welds, l' long. Weld adjacent planks
together with 1/8" fillet welds, 1" long, 24" o.c. staggered top and
bottom.
d. Clamp and bolt attachment—Secure
intermediate planks to supports using ACA anchor and clamp assemble. Use GRIP STRUT
Anchoring Device #12262 with 5/16" carriage bolts and nuts for securing perimeter
planks. Fasten adjacent side rails together with 3/8" machine bolts and nuts and
locally drilled holes.
3.4 Stair tread installation
Install GRIP STRUT Stair Treads shown on the drawings or as herein specified. Fasten
treads to stair stringers with 3/8" x 1" machine bolts and nuts. |
