WDP & Associates | Consulting Engineers

Creating Lasting Solutions Since 1995

Website

About the firm

WDP & Associates is a Manassas, Virginia-based forensic and specialty structural engineering firm founded in 1995. It specializes in building enclosure consulting, forensic structural engineering, facade investigation and repair, and geotechnical engineering across government, education, healthcare, and institutional markets throughout the Mid-Atlantic, Southeast, and Northeast. With six offices and a staff of 40-plus engineers, WDP has kept structures sound for 30 years by combining advanced diagnostic methods with practical repair design.

Established
1995
Team
Midsize
Firm type
Forensic Engineering · Geotechnical Engineering · Materials Testing · Structural Engineering

Credentials

LEED AP BD+C (staff) · PE licensed in multiple states

People

J. Eric PetersonPE, Principal, Chief Executive Officer

Rex A. CyphersPE, Principal, Chief Operating Officer

Gerald A. DalrymplePE, Founding Principal

A. Rhett WhitlockPhD, PE, Founding Principal

Robert J. NiberPE, Principal, Geotechnical Engineering and Testing & Inspection Division Manager

John M. GrillPE, Senior Associate, Manassas Headquarters Division Manager

Andrew W. WagnerPE, Senior Associate, Central Virginia Division Manager

Benjamin TownsendPE, Associate, New York Division Manager

Timothy A. ApisaLEED AP, Senior Project Manager, Blacksburg Division Manager

Capabilities

Building Enclosure Consulting & Building Science

Service website

Comprehensive building enclosure assessments identifying moisture intrusion, thermal deficiencies, and air leakage through testing, analysis, and repair design.

  • Moisture intrusion investigation and repair design
  • Thermal and air barrier analysis
  • Skylight and roof leakage repair

Forensic Structural Engineering

Service website

Structural failure investigation and distress analysis for existing buildings and infrastructure, with expert reporting for insurance claims and litigation.

  • Structural failure and distress investigation
  • Post-earthquake condition assessments
  • Expert witness and litigation support

Facade Investigation & Repair

Service website

Comprehensive facade assessment, investigation, and repair design for masonry, precast concrete, EIFS, and historic stone cladding systems.

  • Masonry facade restoration
  • Precast concrete and EIFS investigation
  • Hokie stone and historic stone facade analysis
  • Efflorescence investigation and remediation

Geotechnical Engineering & Forensics

Service website

Subsurface investigation, geotechnical analysis, and forensic assessment of soil and foundation-related distress.

  • Subsurface investigation and testing
  • Foundation distress forensics
  • Pavement assessment and life cycle analysis

Construction Materials Testing & Inspection

Service website

Third-party testing and special inspection services for structural concrete, masonry, soils, and steel during construction.

  • Concrete and masonry testing
  • Special inspection services
  • Soil and asphalt testing

Building Enclosure Commissioning

Service website

Independent third-party commissioning of building enclosure systems during new construction to verify design intent and performance.

Emergency Response

Service website

Rapid deployment engineering assessment for storm damage, structural collapse, and emergency events affecting existing buildings.

Litigation & Claims Support

Service website

Expert witness testimony, claims analysis, and technical reporting for construction defect and property damage litigation.

Industries

Education · Federal · Government · Public Safety · Arts & Culture · Healthcare · Aviation · Transportation · Multifamily Residential · Residential · Justice & Corrections · Religious · Senior Living

Projects

Moynihan Train Hall

New York, NY · Transportation

Project details

Forensic and enclosure engineering services for the landmark Moynihan Train Hall conversion.

WV State Capitol Dome & Rotunda Investigation and Restoration

Charleston, WV · Government / Federal

Project details

Structural and facade investigation and restoration design for the West Virginia State Capitol dome and rotunda.

Virginia State Capitol Moisture Intrusion and Skylight Leakage Repair

Richmond, VA · Government / Federal

Project details

Investigation and repair design for moisture intrusion and skylight leakage at the Virginia State Capitol.

Virginia Tech Hokie Stone Efflorescence Study & Facade Analysis

Blacksburg, VA · Higher Education · Client: Virginia Tech

Project details

Efflorescence study and facade analysis and repair services for Hokie stone cladding on Virginia Tech campus.