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Advanced enclosure failure investigation · Lesson 4 of 4

Advanced enclosure failure investigation: defects, verification and case study

Four verification questions, correct and incorrect installation evidence, a decision flow from evidence to cause family, a documented case pattern, an illustrative scenario and how to write it up.

You will be able to: Check an AFS-made piece against its order, check an installation against the published guide, weigh substrate and load, work an illustrative case, choose corrective options tied to a cause and document the evidence for review.

14 min · 12 slides · 12 questions

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Slide 1 of 12

Was it made to the order?

Check the piece against its saved profile: leg lengths, included bend angles, hem type, gap and fold, blank width, material, gauge and finish.

Measure the included angle between the legs: 180 degrees is straight through and 90 degrees is a right angle.

FlashDraft hem allowance is a visual and quoting simplification, not an exact bend deduction: compare measured legs to the saved leg list.

Sources

Glossary

Saved profile
The FlashDraft drawing of a piece: its legs, bends, hems, material, gauge and finish, against which a delivered piece is checked.
Included bend angle
The angle between the two legs at a bend: 180 degrees is straight through and 90 degrees is a right angle.
Kickout
The part of the cleat the coping drip hooks over, so the coping is held at its lower edge before the roof-side leg is screwed.
ACQ-treated lumber
Wood treated with a copper-based preservative; Drexel's guide says to isolate all metal from it with a membrane.
Design basis
The loads and conditions the engineer of record designed for; a published rating is compared with it with a factor of safety applied.
Evidence log
A written record of each item kept as evidence, where it was photographed in place, and who held it afterward.