USG Domed Ceilings and Barrel Vaults - Manual (Page 7)

Page 7 of 12
Part 1:
Installation
Instructions
Domes
Step 6 Install secondary Use the primary spokes as a model for hanger locations on the eight (8) secondary spokes. Table 1.2 of the
spokes Construction Specifications indicates the length of the secondary spokes (dimension D). It is important to have
the slots and hanger holes on the primary spokes line up with the ones on the secondary spokes. The only
way to do this is to build the secondary spokes working inward from the perimeter of the dome. Examine
the end of the primary spoke. Measure the distance from the end of the spoke to the first hole
(Figure 10)
(dimension X). Cut the new spoke using the same offset distance and build the new spoke working inward from
the perimeter toward the header
(Figure 10) . Attach the secondary spoke and a hanger wire to the midpoint
of the header (Figure 11) .
Figure 10 – Trim and position secondary spoke
Figure 11 – Attach secondary spoke and hanger wire to midpoint of header
secondary
spoke S2
primary spoke S1
distance to
first cross tee slot
distance to first
cross tee slot
header
X
X
secondary
spoke
header
hanger wire
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