Architectural Flashing Supply
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Manufacturing process engineering · Lesson 2 of 4

Manufacturing process engineering: materials, standards and design constraints

AFS’s geometry and thickness limits, what shop review means, why a gauge is a name and thickness is the number, how thickness varies by gauge, and how a bend is developed from mold-line legs.

You will be able to: Identify the limits that bound a flashing process (geometry, material, thickness variation, bend development) and say whose each limit is: AFS’s, a manufacturer’s or a standard’s.

11 min · 11 slides · 8 questions

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Slide 1 of 11

Say whose value it is

Every limit has an owner: AFS, a manufacturer or a standard, and a lesson or a drawing should say which.

Four families of constraint bound a flashing process: geometry, complexity by thickness, thickness variation, and how a bend develops. A manufacturer’s setting is never presented as code, and a typical value is never presented as an AFS measurement.

Sources

Glossary

Shop review
A result from the AFS limits check for a profile that is allowed but that AFS confirms before it is made.
Girth
The total flat width of a profile once unfolded, hem allowances included; AFS’s limit is 48 in, the width of the sheet.
Mold line
The theoretical sharp corner where two legs meet on the same face; AFS dimensions every leg to it.
Bend allowance
In AFS’s bend model, the length of the bend taken along the neutral axis, calculated as the turn angle in radians times the inside radius plus K times the thickness.
K-factor
In AFS’s bend model, the fraction of the thickness, measured from the inside face, at which the neutral axis lies; it must be measured for a given material, thickness and radius.
Nominal thickness
The stated thickness of a gauge in inches, around which a published band gives a minimum and a maximum.