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Corners, transitions and compound geometry · Lesson 2 of 4

Corners, transitions and compound geometry: materials, standards and design constraints

Project specs and system makers set different corner rules: leg lengths, joint-free zones, sealed, welded and soldered corners, gaps, cleats and approval drawings, inside AFS limits.

You will be able to: Find who sets a corner's leg length, joints, gaps and joining method on a job, and keep every number labelled as that spec's or that maker's.

9 min · 9 slides · 6 questions

All lessons in this module
Slide 1 of 9

Who sets the corner rules

For a corner, the project specification governs first, then the tested system's manufacturer. Leg lengths, joints, gaps and joining methods differ between them, so read the documents for the job.

The SMACNA Architectural Sheet Metal Manual (7th edition, 2012) also covers copings and gravel-stop fascia; it is a paid reference, pointed to here and not quoted.

Sources

Glossary

Corner lock
A seam that locks one sheet over the edge of another at a corner; the CDA details a single and a double seam version.
Splice plate
A plate set into the ends of two pieces at a joint, bedded in sealant, so the joint does not rely on the butt alone.
Pre-tinning
Coating the edges of the sheets with solder before they are soldered together.
Joint gap
The space a system leaves between coping sections for thermal movement; each system sets its own, and some lap their lengths instead.
Print approval
A drawing the buyer approves before a non-standard accessory, such as a non-90 miter, is made.