CAD detail standards and coordination · Lesson 2 of 4

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.

11 min · 12 slides · 7 questions

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Slide 1 of 12

Four facts a detail carries

A fabricator needs four facts from a detail: the metal and its thickness, the geometry, how the joints move, and how it is held.

A federal guide specification asks product data to indicate thicknesses, dimensions, fastenings, anchoring methods and expansion joints.

A New Mexico state template asks shop drawings to show the type and gauge of metal used.

Sources

UFGS 07 60 00 Flashing and Sheet Metal (August 2023, Change 1 05/25) - USACE / NAVFAC / AFCEC (hosted by the Whole Building Design Guide, NIBS)
Section 07 62 00 Sheet Metal Flashing and Trim, template specification (12/2009) - New Mexico Public School Facilities Authority

Glossary

ES-1: The test standard for roof edge systems under simulated wind load: ANSI/SPRI/FM 4435/ES-1, approved November 2022. It tests full-size specimens and gives basic requirements only for the testing.
ED-1: SPRI's design standard for roof edge systems. This module reads the proposed October 2025 revision, which is not an approved edition, and says so wherever it quotes a value.
Cleat: A continuous metal strip that secures a flashing component; a securing piece that is not continuous is a clip. Cleats are generally recommended one gauge heavier than the metal they hold.
Expansion joint: A deliberate break in a long run of metal that lets sections grow and shrink with temperature. Its spacing differs between documents, so the detail states the spacing for its project.
Hem: A folded-back edge on a flashing. AFS draws open hems with a gap, smashed hems closed, and defaults a fold-back of 1/2 in.
Splice plate: A plate behind a gap between lengths of edge metal that stops water getting through while the sections move. ED-1 names it as one way to make a joint.