Otto Rosenau & Associates, Inc.

Get a Construction Inspection in Seattle, Shoreline or Renton, WA


As an independent approved agency, we provide objective and competent assessment of your project.

Special Inspection and Materials Testing:

ORA’s materials testing and inspection division serves projects throughout the northwest, providing project assistance from the initial site preparation through erection and until the final stages of site development. We provide expertise in testing and inspection of soils, asphalt, concrete, masonry, steel, framing, and fireproofing.

  • Soils & Grading:
  • Soil Compaction
  • Asphalt Compaction
  • Concrete:
  • Reinforced Concrete
  • Pre-Stressed Concrete
  • Post-Tensioned Concrete
  • High-Strength Concrete
  • Light-Weight Concrete
  • Shotcrete
  • Augercast Piling
  • Reinforcing Steel
  • Controlled Density Fill
  • Pervious/ Porous Concrete
  • Masonry:
  • Reinforced Masonry
  • Concrete Masonry Units
  • Brick
  • Steel:
  • Structural Steel Fabrication
  • Structural Erection
  • Steel Decking
  • High-Strength Bolting
  • Welding
  • Nondestructive Testing:
  • Ultrasonic Testing
  • Magnetic Particle Testing
  • Liquid Penetrant Testing
  • Framing:
  • Shearwall Nailing
  • Diaphragm Nailing
  • Holdown Installation
  • Anchor Bolt Verification
  • Screw Attachments
  • Sheathing Attachment
  • Stud-Pack Welding
  • Proprietary Anchors
  • Epoxy Grouting
  • Expansion/ Screw Anchors
  • Fireproofing
  • Spray-Applied
  • Intumescent

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Geotechnical Engineering:

Geotechnical investigations are overseen from start to finish by a registered Professional Engineer who is fully involved in the development of the site investigation, field exploration, evaluation of the field and laboratory testing results to develop appropriate cost-effective design, and construction recommendations. Our engineers remain available throughout the design and construction process to address any questions which may arise or to address changes in plans and conditions.

  • Preliminary Site Evaluations:
  • Geological Setting
  • Environmental and Geologic Hazards
  • Soils-Related Design and Construction Challenges
  • Develop and Direct Subsurface Exploration Programs:
  • Test Pits and/or Borings
  • Quantity, Location, and Depth
  • Hollow-Stem Auger or Mud-Rotary Borings
  • Groundwater Monitoring Methods
  • Bulk, Split-Spoon, or Thin-Walled Tube Samples
  • In-House Laboratory Testing:
  • Index Properties
  • Shear Strength
  • Moisture/ Density
  • Engineering Services:
  • Conventional Shallow Foundation Systems,
  • Deep Foundation Systems
  • Foundation Repair Systems
  • Slope Stability Analysis
  • Slope Stabilization
  • Excavation and Shoring
  • Construction Monitoring/ Inspections:
  • Soil Bearing Verification
  • Fill Placement and Compaction
  • Subgrade Evaluation
  • Erosion Control Evaluation
  • Excavation Stability Monitoring
  • Slope Stability Monitoring
  • Shoring Installation
  • Subsurface Drainage Installation
  • Piling
  • Turbidity Testing
  • Cement Treated Base (CTB)

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Locating Services:

ORA is also equipped to provide locating and ground penetrating radar investigation services. We use advanced equipment to locate embedded objects such as reinforcing steel, prestressed tendons, conduits, and voids.

  • Subsurface Interface Radar Investigation (SIR-2000 and StructureScan Mini)
  • Pachometer
  • Metrotech
  • Boroscope with Digital Imaging
  • Video and Remote Imaging Camera

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Specialties & Consulting:

In addition to the traditional structural special inspection and testing capabilities, ORA has in-house specialty expertise.

  • Floor Flatness & Levelness Testing
  • Waterproofing Inspection
  • Moisture Testing
  • Relative Humidity (Rapid RH)
  • Schmidt Hammer Testing
  • Coating Applications Inspection (Paint – Wet and Dry Mil)
  • Pull Testing
  • Brick Shear Testing
  • Crack Monitoring
  • Video Documentation

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Otto Rosenau & Associates, Inc. (ORA) | 6747 Martin Luther King Jr. Way S. | Seattle, WA 98118-3216 | U.S.A