Creating
Code-Compliant Designs
Advertising supplement provided by
National Gypsum Company
Item 2 discusses steel studs as shown
in the design. Steel studs need to be channel-shaped and fabricated
from minimum 25 MSG corrosion-protected steel. You are referred
to item four’s chart (Figure 5) for minimum widths depending
on the hourly rating you chose for your project. Note that
the assembly calls for the studs to be cut 3/8-to-3/4-in.
less than assembly height to allow for heat expansion.
The one-hour assembly shown in the drawing shows batt or
blanket insulation. Again, item four’s chart (Figure
5) will tell you if insulation is required. If insulation
is not required, you may add it to your wall if desired.
Gypsum board orientation, thickness and core type is described
in item 4. For instance, a double layer, two-hour wall should
be constructed with the first layer vertically applied with
joints centered over a stud while the outer layer can be applied
vertically or horizontally (see Figure 5 for minimum stud
depth and thickness of panels). Notice on Figure 5 that a
one-hour wall assembled with 2-1/2" minimum stud depth
and a single layer of 1/2-in. Type C wallboard requires mineral
wool insulation. This is the only design option that requires
insulation.
Type X or type C are also designated under item 4. The chart
tells us that all the systems require either 1/2" or
5/8" type C except for two of the systems. The single
and double-layer assemblies using 5/8" drywall can be
type X. (Each manufacturer has its own core designations for
type X and type C. Refer to the back of your Vol. 1 UL Directory
for reference).
Item 5 concentrates on fasteners. Although not shown in the
drawing, Type S or S-12 steel screws are required. Length
and spacing of fasteners can change with each system.
Item 6 is not shown in the drawing , but describes the joint
treatment necessary to complete the assembly. One point to
remember: only the outside layer requires tape and joint treatment.
Finally, number 7 and 8 are optional and refer to furring
channels and siding, brick or stucco applications. If the
project calls for siding, brick or stucco, these products
must meet the requirements of the local building code.
Try one more.
Question: What is an assembly number for a wooden floor system
using drywall?
You should come up with the letter designation L or M, and
500-599series. An assembly within this designation is L558.
When you are finished, you should be comfortable finding
your way around the UL Directories, and your newfound familiarity
should save you considerable time and aggravation in the design
of fire-rated structures.
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Click
for Additional Required Reading
As part of this CES learning activity,
you are required to read some additional
material.
Note:
Read PDF
page 11 containing a description of assembly L558
as an essential part of this continuing education course.
The rest
of this information is provided as an additional related
resource.
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