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Contact Information: Joseph Corliss 12300 Twinbrook Pky-Suite 600C Rockville, MD 20852 301-443-4205 jcorliss@hqe.ihs.com Activity: Structural Keyword: Wood Trusses CSO No.:06130 Background: Bolted wood trusses were used as roof supports for the Warm Springs facility. Settlement and some lateral movement related to the trusses was noted in some window wall and interior finished areas. Lessons Learned: The wood in large bolted trusses has a tendency to shrink with age as it driesout and the bolted connections will show minor displacement. Recommended Action: During the first several years a preventive maintenance plan of periodic inspection and tightening of the bolted connections should be adopted. If excessive vertical displacement is noted the truss can be jacked in place before tightening the bolted connections. Location: Warm Springs Health and Wellness Center - Warm Springs, OR Program: OEHE/DFPC Date: 08/31/2001