Current through Register 1531, September 27, 2024
Special inspections for sprayed
fire-resistant materials applied to floor, roof and wall assemblies and
structural members shall be in accordance with Sections 1704.12.1 through
1704.12.6. Special inspections shall be based on the
fire-resistance design as designated in the approved construction
documents. The tests set forth in this section shall be based on
samplings from specific floor, roof and wall assemblies and structural members.
Special inspections shall be performed after the rough
installation of electrical, automatic sprinkler, mechanical and plumbing
systems and suspension systems for ceilings, where applicable.
1704.12.1
Physical and visual
tests. The special inspections shall include the
following tests and observations to demonstrate compliance with the listing and
the fire-resistance rating:
1. Condition of
substrates.
2. Thickness of
application.
3. Density in pounds
per cubic foot (kg/m3).
4. Bond strength adhesion/cohesion.
5. Condition of finished
application.
1704.12.2
Structural member surface conditions. The surfaces shall be
prepared in accordance with the approved fire-resistance
design and the written instructions of approved manufacturers.
The prepared surface of structural members to be sprayed shall be inspected
before the application of the sprayed fire-resistant material.
1704.12.3
Application. The
substrate shall have a minimum ambient temperature before and after application
as specified in the written instructions of approved
manufacturers. The area for application shall be ventilated during and after
application as required by the written instructions of
approved manufacturers.
1704.12.4
Thickness. No more
than 10 percent of the thickness measurements of the sprayed fire-resistant
materials applied to floor, roof and wall assemblies and structural members
shall be less than the thickness required by the approved
fire-resistance design, but in no case less than the minimum allowable
thickness required by Section 1704.12.4.1.
1704.12.4.1
Minimum allowable
thickness. For design thicknesses 1 inch (25 mm) or greater, the minimum
allowable individual thickness shall be the design thickness minus
1/4 inch (6.4 mm). For design
thicknesses less than 1 inch (25 mm), the minimum allowable individual
thickness shall be the design thickness minus 25 percent. Thickness shall be
determined in accordance with ASTM E 605. Samples of the sprayed fire-resistant
materials shall be selected in accordance with Sections 1704.12.4.2 and
1704.12.4.3.
1704.12.4.2
Floor, roof and wall assemblies. The thickness of the sprayed
fire-resistant material applied to floor, roof and wall assemblies shall be
determined in accordance with ASTM E 605, making not less than four
measurements for each 1,000 square feet (93 m2) of
the sprayed area in each
story or portion thereof.
1704.12.4.2.1
Cellular decks.
Thickness measurements shall be selected from a square area, 12 inches by 12
inches (305 mm by 305 mm) in size. A minimum of four measurements shall be
made, located symmetrically within the square area.
1704.12.4.2.2
Fluted decks.
Thickness measurements shall be selected from a square area, 12 inches by 12
inches (305 mm by 305 mm) in size. A minimum of four measurements shall be
made, located symmetrically within the square area, including one each of the
following: valley, crest and sides. The average of the measurements shall be
reported.
1704.12.4.3
Structural members. The thickness of the sprayed fire-resistant
material applied to structural members shall be determined in accordance with
ASTM E 605. Thickness testing shall be performed on not less than 25 percent of
the structural members on each floor.
1704.12.4.3.1
Beams and girders.
At beams and girders thickness measurements shall be made at nine locations
around the beam or girder at each end of a 12-inch (305 mm) length.
1704.12.4.3.2
Joists and
trusses. At joists and trusses, thickness measurements shall be made at
seven locations around the joist or truss at each end of a 12-inch (305 mm)
length.
1704.12.4.3.3
Wide-flanged columns. At wide- flanged columns, thickness measurements
shall be made at 12 locations around the column at each end of a 12-inch (305
mm) length.
1704.12.4.3.4
Hollow structural section and pipe columns. At hollow structural section
and pipe columns, thickness measurements shall be made at a minimum of four
locations around the column at each end of a 12-inch (305 mm) length.
1704.12.5
Density. The density of the sprayed fire-resistant material shall not be
less than the density specified in the approved
fire-resistance design. Density of the sprayed fire-resistant material shall be
determined in accordance with ASTM E 605. The test samples for determining the
density of the sprayed fire-resistant materials shall be selected as follows:
1. From each floor, roof and wall assembly at
the rate of not less than one sample for every 2,500 square feet (232
m2) or portion thereof of the sprayed area in each
story.
2. From
beams, girders, trusses and columns at the rate of not less than one sample for
each type of structural member for each 2,500 square feet (232
m2) of floor area or portion thereof in each
story.
1704.12.6
Bond strength. The
cohesive/adhesive bond strength of the cured sprayed fire-resistant material
applied to floor, roof and wall assemblies and structural members shall not be
less than 150 pounds per square foot (psf) (7.18
kN/m2). The cohesive/adhesive bond strength shall be
determined in accordance with the field test specified in ASTM E 736 by testing
in-place samples of the sprayed fire-resistant material selected in accordance
with Sections 1704.12.6.1 through 1704.12.6.3.
1704.12.6.1
Floor, roof and wall
assemblies. The test samples for determining the cohesive/adhesive bond
strength of the sprayed fire-resistant materials shall be selected from each
floor, roof and wall assembly at the rate of not less than one sample for every
2,500 square feet (232 m2) of the sprayed area in
each story or portion thereof.
1704.12.6.2
Structural members.
The test samples for determining the cohesive/adhesive bond strength of the
sprayed fire-resistant materials shall be selected from beams, girders,
trusses, columns and other structural members at the rate of not less than one
sample for each type of structural member for each 2,500 square feet (232
m2) of floor area or portion thereof in each
story.
1704.12.6.3
Primer, paint and encapsulant bond tests. Bond tests to qualify a
primer, paint or encapsulant shall be conducted when the sprayed fire-resistant
material is applied to a primed, painted or encapsulated surface for which
acceptable bond-strength performance between these coatings and the
fire-resistant material has not been determined. A bonding agent
approved by the SFRM manufacturer shall be applied to a
primed, painted or encapsulated surface where the bond strengths are found to
be less than required values.
