Where can I find information on evaluation, maintenance and repair of existing structures?

• Wood and Timber Condition Assessment Manual
  by Robert J. Ross, Brian K. Brashaw, Xiping Wang, Robert H. White, and Roy F. Pellerin.
  Available at http://www.forestprod.org/mycart/index.php?categoryID=10
  
  Forest Products Society
  2801 Marshall Ct.
  Madison, WI 53705-2295
  
  Website: http://www.forestprod.org
  Phone: (608) 231-1361 ext. 202
  
  
  Here's contact information for the lead author:
  
  Dr. Robert J. Ross
  E-mail: rjross@fs.fed.us
  Phone: (608) 231-9210
  Website: http://www.fpl.fs.fed.us/rwu4723/rwu4719/index.html
  
  
• Other resources:
  
  Evaluation, Maintenance and Upgrading of Wood Structures: A Guide and Commentary. Published by ASCE (Committee on Wood), 1982. Available at https://www.asce.org/bookstore/book.cfm?book=3003
  ISBN # 0872623173
  
  Evaluation and Upgrading of Wood Structures: Case Studies. Published by: ASCE(Proceedings of a session at Structures Congress, 1986). Edited by: Vijay K. A. Gopu. Available at https://www.asce.org/bookstore/book.cfm?book=2984
  ISBN # 0872625508
  
  
• Grading of existing timbers

West Coast Lumber Inspection Bureau (WCLIB) will grade existing timbers. Here's contact information:

WEST COAST LUMBER INSPECTION BUREAU
PO Box 23145
Portland, Oregon 97281-3145
503-639-0651
Fax: 503-684-8928
http://www.wclib.org/

MO-111.1 Inspection of Wood Beams and Trusses (09-01-1985)
NAVFAC Maintenance & Operations Manual
http://www.wbdg.org/ccb/NAVFAC/OPER/mo111_1.pdf

Historical Considerations in Evaluating Timber Structures
R. L. Tuomi and R. C. Moody, Engineers
Forest Products Laboratory U.S. Department of Agriculture
http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr21.pdf


• Fire and Smoke Repair
  
Restoration Industry Association Guidelines for Fire & Smoke Damage Repair, 2nd Edition


• Classic texts online
  
Rankin, William John MacQuorn (1866): Useful Rules and Tables relating to Mensuration, Engineering, Structures, and Machines, Charles Griffn and Company, London, UK.
Includes timber design properties (see p.199).

Johnson, J.B. (1904): The Materials of Construction - A Treatise for Engineers on the Strength of Engineering Materials, Fourth Edition, John Wiley & Sons, New York, USA.
Comprehensive strength of materials text for typical materials of the time, including timber (see p.236-238).

Ketchum, Milo S. (1918): Structural Engineers Handbook - Data for the Design and Construction of Steel Buildings and Bridges, Second Edition, McGraw-Hill Book Company Inc., New York, USA.
Includes timber Bridges and trestles (see p.298).

Jacoby, H.S. (1909): Structural Details or Elements of Design in Timber Framing, John Wiley & Sons, NY, USA.
An early authoritative text on timber detailing, joints, connections, design, and more.