Edward K. Takahashi, FAIA, FACIA, CCS Expert Witness

Contact Information

  • Company: Edward K. Takahashi Architectural Corporation
  • Phone: (323) 980-8000
  • Fax: (323) 980-8008
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Specialties & Experience

General Specialties: Architecture and Construction Defects

Specialty Focus: Design Defects, Construction Technology, Construction Industry Inter-Relationship, Preparation for Arbitration and Litigation, Peer Reviews, Building Envelope Consultant, AIA Code of Ethics and Professional Conduct.

Education: Bachelor of Architecture, University of Southern California

Years in Practice: 35+

Number of Times Deposed/Testified in Last 4 Yrs: 11


Additional Information

1992, authored "What My Mother Didn't Tell Me About.....Nails" after voluminous nailing deficiencies in shear panels, floor and roof diaphragms of wood-frame construction; which was submitted to Los Angeles Building Department. Within 60 days, Building Officials required use of box nails or 20% common nail values, or use of common nails with certified by the engineer of record or an approved inspection firm for shear panels, floor and roof diaphragms. Developed and had a stainless steel nail gauge manufactured for City of Los Angeles Building Department, after investigation of the 1994 3-story Northridge Meadows Apartment collapse. As Advisory Group member for Consortium of Universities for Research in Earthquake Engineering (CUREE) for repairs of wood frame buildings, funded by FEMA and administered by Cal Tech, recommmemded separate testing of wood frame component tests with common and box nails. CUREE determined "...gun-driven box nails may be on the order of 20% lower than common nails...for wood structural panel walls...". Fire-tested SBS mineral-surfaced cap sheet as underlayment for cement and clay tile Roof Systems. Had strength of Plywood versus Oriented Strand Board (OSB) tested for shear connections with Simpson A-35 Framing Anchors screwed to structural roof diaphragm edges in original dry state and after it was wet and dried. OSB slightly stronger than plywood in original dry conditions. Plywood 25% stronger than OSB after wetting and drying cycles. Former member of American Arbitration Associations Large Complex Case Panel. Assisted and observed fire testing of wood blocking, fiberglass and Cordex/Insulstop cellulose insulation in wood frame double party wall construction. Wood blocking burned through in 40-minutes. All insulation materials were intact after 1-hour and 45 minutes.