FLAT JACK® Installation Manual
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loads. TTi provides recommended mounting
configurations of the FLAT JACK® for purposes of meeting
different design load capacities.
4.3 FLAT JACK® Mounting
Configurations vs. Capacities
The FLAT JACK® may be installed in various mounting
configurations to meet different design load capacity
requirements for uplift and lateral loads.
Mounting config-
uration
refers to the position of the mounting bolts that
secure the FLAT JACK® base plate to the roof.
Selecting Mounting Configurations
The maximum uplift load normal to the mounting
surface depends on the location of the mounting bolts
that secure the FLAT JACK® base to the roof. The
following mounting bolt configurations are
recommended:
•
Configuration A: This configuration is for applications
where uplift loads due to wind or other design
considerations (seismic, ice, rain, etc.) are of greatest
concern. See Figure 4-1. Configuration A is for uplift
loads to 500 lbf (2220 N), and so permits wider
spacing under given conditions than the other
configurations.
•
Configuration B: This configuration is for applications
where adjustability is necessary, and uplift loads are
less of a concern. See Figure 4-2. Configuration B is for
uplift loads to 375 lbf (1670 N).
•
Configuration C: This configuration can be used
under favorable uplift loading conditions (up to 140
lbf, or 620 N). See Figure 4-3.
NOTE:
Upload capacity can be traded off against
spacing between mounts when designing the
roof layout.
Configuration A Description
In Configuration A, one fastener must be used in the
lower bolt hole, and another at the end of the bolt slot
closest to the stud.
Summary of Contents for FLAT JACK
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