USG Domed Ceilings and Barrel Vaults - Manual (Page 5)

Page  of 12
Part 1:
Installation
Instructions
Domes
Step 5 Add headers to Steps -7 are not needed for domes smaller than 10-1/2 in diameter (dimension L). If your dome is smaller
expand spokes than this, headers are not required. Go to Step 8.
For domes 10-1/2 in diameter or larger (dimensions L – see page 4), where spokes get too far apart to support
the dome (48 or more), short pieces of tees, called “headers”, are required to span between the spokes. Table 1.
of the Construction Specifications indicates the length (dimension C) of the headers required. Depending on the
size of the dome, several rows of headers may be required.
1. Prepare eight (8) headers. When cutting headers, they must be trimmed at both ends to avoid interference.
Cut the headers to the length specified in the Construction Specifications (Figure 7A) (dimension C). Snip the
bulb back about 1/4 (Figure 7B) and the face back about /8 (Figure 7C) . It is important that the headers are
all cut to the same length.
Figure 7 – Trim headers at both ends
A
B
C
grid face
grid face
 /
8
"
arc length
"C"
1 / 4
"
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