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Installation

Instructions

Domed Ceilings and

Barrel Vaults

USG Drywall Suspension System

These installation instructions are divided into two parts: Part 1 applies to domed ceilings, and Part 2 applies

to vaulted ceilings. Note: For installation instructions for vaulted ceilings with domed ends, follow Part I for

domed ceilings to build the ends first.

To ensure proper installation, read all instructions before you begin. Check the enclosed Bill of Materials to

be sure that all parts and equipment are present and undamaged. Note: Parts will be permanently damaged if

installed incorrectly.

To generate a set of construction specifications on-line, go to www.usg.com > Resources > Online Tools.

Parts

Construction specifications (supplied separately) Bill of materials (BOM)

Custom curved tees

DGHUB Dome hub (if specified on BOM) DGSP180 Main tee splice plates (if specified on BOM)

DGLW Cross tees (if specified on BOM) DGWC24 Wall attachment clips (if specified on BOM)

Supplies

Hanger wire Self-drilling screws

Tools

In addition to standard 16 to 32 spring clamps Locking “C” clamp

grid installation tools,

you should have:

Technical Service 800 USG.4YOU

Samples, Literature 888 874.2450

Customer Service 800 950.3839

usg.com

12-ga. galvanized steel wire in

straight lengths

#2 Philips round washer-

head or similar

Summary of content (12 pages)

PAGE 1
Installation Instructions Page 1 of 12 Domed Ceilings and Barrel Vaults USG Drywall Suspension System These installation instructions are divided into two parts: Part 1 applies to domed ceilings, and Part 2 applies to vaulted ceilings. Note: For installation instructions for vaulted ceilings with domed ends, follow Part I for domed ceilings to build the ends first. To ensure proper installation, read all instructions before you begin.
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Domes Part 1: Installation Instructions Page of 12 Step 1 Gather construction Dome construction specifications are prepared specifically for each dome, and may be provided by the architect, specifications your USG representative, or you can generate a set on-line at www.usg.com > Resources > Online Tools. These specifications include important tables, diagrams, and dimensions that you will need to install a dome successfully. For additional help, contact your USG representative.
PAGE 3
Part 1: Installation Instructions Domes Page of 12 Tip: Tip: Extra hanger holes are provided to help work around obstructions; however, the space between any two hanger wires must not exceed 32 (every fourth hole). It may be easier to mark hanger locations on a tape measure or a long stick and use this as a template against the ceiling.
PAGE 4
Part 1: Installation Instructions Domes Page of 12 Step 4 Assemble and hang The first row in Table 1.2 of the Construction Specifications indicates the arc length required for each of primary spokes primary spokes (dimension D). Prepare each spoke by measuring along the arc of the tee and trimming the the end to the required length. Depending on the size of the dome, several tees may need to be connected to form the length required.
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Domes Part 1: Installation Instructions Page of 12 Step 5 Add headers to expand spokes Steps 5-7 are not needed for domes smaller than 10-1/2 in diameter (dimension L). If your dome is smaller 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.
PAGE 6
Part 1: Installation Instructions Domes Page of 12 Step 5 2. Table 1.3 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.
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Part 1: Installation Instructions Domes Page of 12 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.
PAGE 8
Domes Part 1: Installation Instructions Page of 12 Step 7 Install additional headers and spokes Additional headers and secondary spokes are generally needed for domes larger than 21 in diameter (dimension L). For construction of additional headers and spokes, refer to tables 1.2 and 1.3 of the Construction Specifications. Progression of assembly is H1, S2, H2, S3, and so on (Figure 12).
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Barrel Vaults Part 2: Installation Instructions Page of 12 Step 1 Gather construction Vault construction specifications are specifications your USG representative, or you can Step 2 Install hanger wires Curved prepared specifically for each vault and may be provided by the architect, generate a set on line at www.usg.com > Resources > Online Tools. The construction specifications include important tables, diagrams and dimensions that you will need to complete the vault successfully.
PAGE 10
Barrel Vaults Part 2: Installation Instructions Page 10 of 12 Step 3 Install main tee ribs T he construction specifications indicate the total arc length required for each main-tee rib (dimension G). Begin constructing each rib by hanging a main tee at the apex. Hang the main tee so that a cross-tee slot is at the apex (Figure 16). Work outward at both ends, connecting curved tees as needed using splice plates provided (Figure 17). Grid face elevations (measured from perimeter) are shown in Table 2.
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Barrel Vaults Part 2: Installation Instructions Page 11 of 12 Step 5 Cut and terminate For perimeter cuts, cut in and terminate cross tees at both ends of the vault. cross tees for 1. If the vault terminates at a perpendicular wall, attach a complete main-tee rib against the wall using wall perimeter cuts attachment clips (Figure 19). Space the clips about 4 on center (every sixth slot). Use the ledge of this rib to attach cross tees.
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Technical Service 800 USG.4YOU Samples, Literature 888 874.2450 Customer Service 800 950.3839 usg.com Literature number AC3157 Product Information See usg.com for the most up-to-date product information. Note All products described here may not be available in all geographic markets and are subject to change without notice. Consult your local sales office or representative for information. Manufactured by USG Interiors, Inc.