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seismic-technical-guide-perimeter-cross-tees-en-SC2511.pdf Seismic Technical Guide Technical Document Perimeter Cross Tees with ACM7 Seismic Clip USG® offers numerous D® suspension systems cross tees designed to function with the ACM7 Seismic Clip ONN USG ACM7 seismic clip in all seismic design categories A-F. Use this guide to ensure that the connection of the perimeter cross tees with the ACM7 seismic clip functions to meet the prior to designing and installing a ceiling system. 1 in. In a 2 ft. x 2 ft. layout, the 4 ft. cross tees are typically utilized at the perimeter and cut to size to meet the perimeter wall. This is an economical method as both ends of the 4 ft. cross tee can be used for cuts smaller than 2 ft. and produces no additional waste versus cutting a 2 ft. cross tee. The following layouts illustrate these differences. Standard Non-Seismic Tee Patterns KEY Main Tee 4 ft. Cross Tee 2 ft. Cross Tee 2 ft. x 4 ft. For a 2 ft. x 4 ft. ceiling layout, full-length main tees (red lines) are spaced 4 ft. on Tee Layout center (o.c.), as measured from the center of one tee to the center of the next, with 4 ft. cross tees (blue lines) installed perpendicular, 2 ft. o.c. 2 ft. x 2 ft. For a 2 ft. x 2 ft. ceiling layout, additional 2 ft. cross tees (green lines) are installed Tee Layout parallel to the main tees, and installed at the perimeter. 2 ft. x 2 ft. For this 2 ft. x 2 ft. ceiling layout, additional 2 ft. cross tees Tee Layout (green lines) are installed parallel to the main tees and 4 ft. (alternative) cross tees are installed at the perimeter perpendicular to the main tees at 2 ft. o.c. 2 Standard Seismic Tee Patterns with USG ACM7 Seismic Clip KEY Main Tee USG ACM7 Seismic Clip 4 ft. Cross Tee Pop Rivet 2 ft. Cross Tee Surrounding Wall Perimeter Trim USG ACM7 Seismic Clips USG ACM7 Seismic Clips and Pop Rivets 2 ft. x 4 ft. Tight / Fixed SideTight / Fixed Side Tee Layout Floating / Unattached SideFloating / Unattached Side Tight / Fixed SideTight / Fixed Side Floating / Unattached SideFloating / Unattached Side 2 ft. x 2 ft. 2 ft. x 2 ft. Tee Layout Tight / Fixed Side Tight / Fixed Side Tee Layout Floating / Unattached Side Floating / Unattached Side Tight / Fixed Side Tight / Fixed Side Floating / Unattached Side Floating / Unattached Side 2 ft. x 2 ft. Tight / Fixed Side Tight / Fixed Side Tee Layout (alternative) Floating / Unattached Side Floating / Unattached Side Tight / Fixed Side Tight / Fixed Side Floating / Unattached Side Floating / Unattached Side 3 USG ACM7 Seismic Clip M7 7 /" 8 7/" 8 Side Front 1 in. Tee Height 1" 1-1/2 in. Tee Height 1 1/" 2 1-5/8 in. Tee Height 5 1/" 8 1-3/4 in. Tee Height 1 3/" 4 Note: ¾ in. gap shown is typical for seismic design categories D-F. 3/8 in. gap is typical for seismic design category C. 4 Tight / Fixed Side USG ACM7 Seismic Clip Perimeter Cross Tee Options 1-1/2 in. or greater. Use the following guidelines to ensure that the connection of the 2 ft. perimeter cross tees with the ACM7 seismic clip functions to meet the required seismic design criteria. 1. Utilize 4 ft. cross tees for all perimeter tees. Standard Installation: 2. Utilize both 4 ft. and 2 ft. cross tees around the perimeter. – 4 ft. Cross Tees with the USG ACM7 Seismic Clip: Standard Installation: – 2 ft. Cross Tees with the USG ACM7 Seismic Clip: The following seismic clip installation guidelines apply: Installation: Insert a Type S screw through the center of slot in the ACM7 seismic clip and through the web of the Seismic Designn Category C Installation: 2 ft. cross tee. The screw will provide vertical support of the tee-ends while allowing lateral movement. Do not tighten this screw as this will restrict the lateral movement of the tee. Construction: Seismic Disgn Category D, E & F Installation: through the web of the 2 ft. cross tee. The screw will provide vertical support of the tee-ends while allowing lateral movement. Do not tighten this screw as this will restrict the lateral movement of the tee. from the perimeter and through the web of the 2 ft. cross tee. This fastener will restrict any lateral movement of the tee. It is not necessary to tighten this screw.. Construction: Floating / Unattached Side Tight / Fixed Side 5 PurposeSafety First! Product InformationL.A. Research Report See usg.com for the most up-to-This seismic technical guide Compliance Follow good safety/industrial (STG) is intended as a resource D brand suspension systems hygiene practices during date product information. ONN for design professionals, to manufactured by USG Interiors, installation. Wear appropriate Installation promote more uniform criteria Inc., have been reviewed and personal protective equipment. Must be installed in compliance for plan review and jobsite are approved by listing in the Read MSDS and literature with ASTM C636, ASTM E580, following L.A. Research Report inspection of projects. This CISCA, and standard industry STG indicates an accept-number: 25764.installation. practices. able method for achieving Notice compliance with applicable Code Compliance We shall not be liable for codes and regulations, although The information presented incidental and consequential other methods proposed by is correct to the best of our damages, directly or indirectly design professionals may be knowledge at the date of sustained, nor for any loss considered and adopted. issuance. Because codes caused by application of these continue to evolve, check ICC Evaluation Service, Inc., goods not in accordance with current printed instructions or Report Compliance designing and installing a ceiling Suspension systems for other than the intended use. system. Other restrictions and manufactured by USG Interiors, Our liability is expressly limited to exemptions may apply. This replacement of defective goods. Inc., have been reviewed and is only intended as a quick are approved by listing in Any claim shall be deemed reference. ICC-ES Evaluation Report 1222. waived unless made in writing to us within thirty (30) days from Evaluation Reports are subject to reexamination, revision and date it was or reasonably should possible cancellation. Please have been discovered. refer to usgdesignstudio.com or usg.com for current reports. 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