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Product selection and substitutions · Lesson 4 of 4

Product selection and substitutions: defects, verification and case study

How a bad substitution shows up, the arithmetic of a lighter gauge, why copying a tested profile does not copy its test, receiving checks, a constructed galvanic case study and how to document it for review.

You will be able to: Diagnose a plausible substitution defect, explain corrective options, and document the evidence a reviewer needs, including when the honest answer is no.

10 min · 10 slides · 8 questions

All lessons in this module
Slide 1 of 10

How substitution failures look

Five symptoms follow from the earlier lessons: edge metal blow-off, corrosion where unlike metals meet, joints that cannot take the movement, a color that does not match, and a warranty dispute.

Each one traces to a row of the comparison that was skipped.

Sources

Glossary

Value engineering
A change made to reduce cost; an IIBEC article by manufacturer staff says value engineering has led to lighter-gauge edge metal that failed.
Certificate of compliance
A document requested from the supplier, per profile fabricated, stating that an edge product complies with ES-1; the IIBEC article calls requesting it good practice.
Receiving inspection
Checking a delivered product against the approval and the submitted documents before it is installed: thickness, metal, color name, finish data, parts, room for movement and the metals on the water path checked against a galvanic series.
Not offered
An AFS comparison status meaning nothing in the AFS catalog or fabrication limits matches what the specification names.