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Visual reference library

Compare visible wood symptoms and assembly details. Use visual observations to frame an investigation without treating appearance as a diagnosis.

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Record and method references

Keep four kinds of information separate

Keep four kinds of information separate
Example: staining near a fastener is an observation. Corrosion is one possible explanation; appearance alone does not verify it. Open diagram, transcript and download

Observation: What you can directly see or measure.

Hypothesis: A possible explanation to investigate.

Evidence: A record that tests the explanation.

Decision: A documented action by the responsible person.

Describe the direction of distortion

Describe the direction of distortion
Describe direction and location before discussing cause. These vocabulary distinctions do not grade a board or establish safe use. Open diagram, transcript and download

Cup: Curvature across a board’s width.

Bow: Curvature along the face length.

Crook: Curvature along an edge.

Twist: Corners depart from one plane.

Three scales make a useful photo record

Three scales make a useful photo record
Photograph only from a safe position. A scale beside the surface cannot reveal hidden depth, condition or load capacity. Open diagram, transcript and download

Overview: Show the component within its surroundings.

Context: Show neighboring boards, supports and water paths.

Detail: Show the feature with a safe, visible scale.

Repeat: Use the same location and preserve original files.