Architectural Flashing Supply
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CAD detail standards and coordination · Lesson 1 of 4

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.

10 min · 10 slides · 7 questions

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Slide 1 of 10

What a detail is

A detail is a large-scale drawing of one condition, such as flashing built where a roof meets a parapet wall.

It is drawn large so each part can be named, checked and bought. This is a teaching definition by function.

A federal guide specification note says the drawings show base and counter flashings, fascia, drip edges, trim, gutters and expansion joint details.

Sources

Glossary

Detail
A large-scale drawing of one condition, such as how flashing is built where a roof meets a parapet wall. This is a teaching definition by function, not a quotation from a standard.
Callout
A symbol on one sheet, called a section or detail indicator, that points to the sheet where a view is drawn. The VA lists section and detail indicators among the NCS reference symbols.
Layer
A named group of CAD objects. Under the NCS naming the VA describes, the name is a discipline designator, a major group and optionally a minor group and a status, joined by hyphens.
Graphic scale
A drawn scale bar on the same sheet as a scaled view, so the scale survives printing at a different size. The VA requires one for every scaled view.
Mold line
In AFS practice, the sharp-corner path of a flashing section through its bends. AFS measures legs and girth on it, not on the bend radii.
INSUNITS
A drawing-file setting that records the unit the drawing was made in. 0 means unspecified, 1 inches and 4 millimeters. AFS reads it and does not assume inches when it is missing.
Girth
The total flat width of a flashing piece, hems included. AFS can make a girth of up to 48 in, the width of its sheet.