USG Domed Ceilings and Barrel Vaults - Manual (Page 8)

Page 8 of 12
Part 1:
Installation
Instructions
Domes
Step 7 Install additional Additional headers and secondary spokes are generally needed for domes larger than 21 in diameter
headers and spokes (dimension L).
For construction of additional headers and spokes, refer to tables 1.2 and 1. of the Construction
Specifications. Progression of assembly is H1, S2, H2, S, and so on (Figure 12) .
Figure 12 – Assembly progression of headers and spokes
Step 8 Install cross tees Beginning at the perimeter, cut, fit, and screw-attach cross tees into all openings so that the maximum
open space is 16 inches
(Figure 13) . For the length of the perimeter cross tee, refer to the general data in
the construction specifications.
Figure 13 – Cross-tee installation
Tip: Exact locations of cross tees are not critical in this step since their purpose is only to provide a surface for
material attachment.
Step 9 Finish the dome Brace the completed dome suspension system against the surrounding structure as necessary to prevent move-
ment. Apply lath and plaster to the exposed surface of the suspension system as indicated on the architectural
plans. Use S
truCto -B aSe ™ plaster only. Check the architectural plans for any perimeter transition treatments
that may be required. Examples may be found in the USG drywall suspension system brochure (AC12).
cross tees
perimeter cross tees
cut to fit 16" o.c.
S2
S3
H2
H1
S1
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