CAD detail standards and coordination
How a flashing detail is found in a drawing set, organized by layer, scale and unit, annotated, checked against tested assemblies and AFS limits, and coordinated with the specification.
4 lessons · about 40 min · 14 diagrams · 0 videos
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0 of 4 complete
Lesson 1 · 10 min · 10 slides · 7 questions
CAD detail standards and coordination: principles and terminology
What a flashing detail is, how a drawing set and the National CAD Standard organize it, how layers, scale and units work, and how AFS draws a section.
You will be able to: Find a flashing detail from its callout, confirm its scale and units, say what a layer name tells software, and state what a detail does and does not promise.
Not startedStart →Lesson 2 · 11 min · 12 slides · 7 questions
CAD detail standards and coordination: materials, standards and design constraints
Metal and thickness, flat-face rules, movement and joints, the tested assembly, what the specification adds, joint spacing, AFS limits and the order a coping goes on.
You will be able to: List the facts a flashing detail must carry so it can be fabricated, checked and installed, and name the document that governs each one.
Not startedStart →Lesson 3 · 9 min · 11 slides · 6 questions
CAD detail standards and coordination: methods and worked application
An eight-step detail packet method, with four worked examples: girth against the 48 in limit, a tested row lookup, expansion joint counts and piece counts.
You will be able to: Apply an eight-step method to a coping detail, with units, limits and the tested row checked, and record assumptions and open questions.
Not startedStart →Lesson 4 · 10 min · 11 slides · 6 questions
CAD detail standards and coordination: defects, verification and case study
Eight common detail defects with corrections, a review checklist, the case where a 36 in wall height was read as a coping leg, and what to send with a packet.
You will be able to: Diagnose a drawing or coordination defect, state the corrective options, and document the evidence for review, including the wall-height case.
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Practical task
Build a detail packet for a coping on a 12 in wide parapet wall with a 4 in face and 3 in back leg: a marked-up section on the mold line with legs lettered and the unit stated, the metal named with its thickness, the girth checked against 48 in, the tested row looked up, the joint spacing stated for a 100 ft run, and the assumptions and written questions recorded.
Hand in
- A decision rationale: which documents govern each fact on the detail (specification, tested assembly data, AFS limits) and why
- A marked-up section on the mold line: legs lettered, unit and scale stated, material and thickness, hem type and return, cleat and fasteners
- An assumptions sheet with units: wall width, fit allowance, metal, piece length and joint spacing, each labeled as a source value, a manufacturer value or an assumption
- A quality checklist built from the ten review tests, each marked pass, fail or ask
- A defect analysis for one defect found in a sample detail: what was seen, the document it breaks, the correction and the evidence kept
Rubric
| Criterion | Meets the standard when |
|---|---|
| Units and frame | The unit, scale and layer names are stated before any dimension, and no unit is assumed. |
| Girth and limits | The flat width is worked with units, hems included, and compared with the 48 in limit and the piece length limits. |
| Tested row | The row applied matches the exact metal, face height and wall width, is labeled as a manufacturer value, and names the factor-of-safety owner. |
| Joint spacing | The spacing cites the document it comes from and does not present one project's number as a national rule. |
| Records | Every assumption is listed, and each unresolved discrepancy in the contract documents is written as a question to the party who decides, and the rule that applies under that contract for a drawing and specification difference is stated. |