USG Domed Ceilings and Barrel Vaults - Manual (Page 6)

Page 6 of 12
Part 1:
Installation
Instructions
Domes
Step 5 2. Table 1. of the Construction Specifications indicates the correct position of each header (dimension A).
(continued) Position and attach all headers and temporarily hold them in place with spring clamps (Figure 8) . Use the
cross-tee holes on the primary spoke as a guide for positioning. The web of the header should fall in line
with a cross-tee hole on the spoke (1/16). The spring clamps will allow you to adjust the positions.
Figure 8 – Hold headers in place with spring clamps
Tip: If the headers seem tight and you’re having difficulty lining up the slots on the spokes, double-check
the lengths of the headers to make sure they’re trimmed properly. All eight (8) headers must be cut to the
same length.
3. Once all headers are in position, clamp the intersection and permanently attach the headers to the spokes
using self-drilling screws (Figure 9) . For best results, use #8 x 1/2 washer-head self-drilling screws.
4. Examine each of the spokes from one end to make sure they are not twisted or pushed out of line at the
header intersections. If header adjustments are needed, make them now.
Figure 9 – Screw-attach headers
header H1
A
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