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CAD detail standards and coordination · Lesson 3 of 4

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.

9 min · 11 slides · 6 questions

All lessons in this module
Slide 1 of 11

The eight-step packet

The packet method has eight steps: pull the documents, set the frame, draw on the mold line, annotate, check AFS limits, check the tested row, coordinate with neighbors, and record assumptions.

Each step names the document it leans on, so a reviewer can trace it.

The eight-step detail packetProcess flow of eight numbered steps: identify the condition and pull every document; set unit, scale and layers; draw on the mold line and letter the legs; annotate metal, thickness, finish, hem and cleat; check AFS limits; check the tested row; coordinate with neighboring details; record assumptions and raise written questions. After step 5 a decision asks whether the section is inside AFS limits; if not, the section is redesigned and drawing resumes at step 3.1Identify the condition,pull every document2Set unit, scale, layers3Draw on the mold line,letter the legs4Annotate metal, thickness,finish, hem, cleat5Check AFS limits,girth 48 in or less6Check the tested row7Coordinate withneighboring details8Record assumptions,raise written questionsInside limits?yesnoRedesignthe section

Process flow of eight numbered steps with a decision after step 5: identify the condition and pull every document; set unit, scale and layers; draw on the mold line and letter the legs; annotate; check AFS limits; check the tested row; coordinate with neighbors; record assumptions and written questions. If the section is not inside limits it is redesigned and drawing resumes at step 3.

1
Identify the condition and pull every governing document
2
Set the unit, scale and layer names before drawing
3
Draw the section on the mold line and letter the legs
4
Annotate metal, thickness, finish, hem and return, cleat and fasteners
5
Check AFS limits: girth 48 in or less, piece length
6
Check the tested row against the exact assembly
7
Coordinate with the neighboring details
8
Record assumptions and raise written questions
Step 5 is in AFS red because its limits are AFS register values; step 6 is in steel blue because the tested row is a manufacturer value. A teaching sequence, not a standard.

Sources

Glossary

Detail packet
In this module, a detail plus its documented basis: the marked-up drawing, the units and metal assumed, the limits checked, the tested row cited and the open questions. This is a teaching definition.
Fit allowance
Extra width added to a coping so it fits over the wall. AFS's generator adds 1/2 in, following the Drexel Snap Coping-Max guide drawing; it is not a general rule for every coping.
Sustained pressure
The pressure Drexel publishes for an exact edge assembly in an ES-1 test row. Negative means outward. The design engineer applies the factor of safety.
Written question
A request, in writing, to the party who decides a question about the contract documents. Under the federal clause a discrepancy in the figures, the drawings or the specifications goes to the Contracting Officer, who answers in writing; a plain difference between drawings and specifications is settled by the clause itself, with the specifications governing. Other contracts follow their own terms.