Architectural Flashing Supply
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Tier 4 · Advanced Fabrication and Manufacturing

Compound transitions and complex forms

How cones, transitions, unequal and peak miters, crickets and radius pieces differ from straight lengths, how their patterns are calculated and joined by metal, how they are installed to shed water, and how to diagnose and inspect their faults.

4 lessons · about 42 min · 10 diagrams · 6 videos

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Lessons

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  1. Lesson 1 · 10 min · 12 slides · 6 questions

    Compound transitions and complex forms: principles and terminology

    What makes a flashing piece complex: cones, transitions, unequal and peak miters, crickets and radius coping; the words of radial line and triangulation; and the hazards of cut edges, lead solder and flame.

    You will be able to: Tell a straight prism from a complex form, name the three pattern development methods and their terms, and state the safety boundaries for cut edges, solder and hot work.

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  2. Lesson 2 · 10 min · 12 slides · 6 questions

    Compound transitions and complex forms: materials, standards and design constraints

    Specification, maker and code each set rules for complex pieces: approval drawings, soldering and welding by metal, seam minimums, solder alloys, copper tempers, coating flexibility and AFS fabrication limits.

    You will be able to: Find who sets the rules for a complex piece, choose its joint by metal and thickness from the governing specification, and check its flat parts against AFS's published limits.

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  3. Lesson 3 · 12 min · 12 slides · 8 questions

    Compound transitions and complex forms: methods and worked application

    Worked examples with every number shown: a frustum by radial line, square to round true lengths, unequal-width and peak miters, cone on a pitch and seam allowance, then the installation of a pipe sleeve and hood and a cricket.

    You will be able to: Choose a development method, calculate a frustum pattern, square to round true lengths and miter angles with every input and unit recorded, and set out how a pipe sleeve and a cricket are installed so every lap sheds water.

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  4. Lesson 4 · 10 min · 10 slides · 6 questions

    Compound transitions and complex forms: defects, verification and case study

    The faults that ruin complex pieces, worked through with numbers: slant height versus height, true versus plan length, seam allowance, joints and laps; how to verify a pattern and inspect the work; and a chimney and pipe collar case study.

    You will be able to: Diagnose a short cone, a transition that will not reach, a wrong joint or a missing cricket from its cause, choose a correction, and record the evidence a reviewer needs.

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Practical task

Prepare a job packet for one complex piece of your choice: a frustum pipe collar, an on-centre square to round, or a cricket behind a chimney. Record the method and why, the layout numbers with every input and unit, the joint chosen from the governing specification, the installation laps, a quality checklist and one diagnosed defect with its fix.

Hand in

  • A dimensioned sketch of the piece, every dimension labelled with its unit and marked as an example or a site measurement
  • The method chosen (parallel line, radial line or triangulation) with one sentence on why it fits the form
  • The layout numbers: slant height, arc radii and pattern angle with the arc check, or a true length table from a TLD
  • The joint and seam choice for the metal, cited to the clause of the governing specification, and the seam allowance shown outside the stretch-out
  • The installation lap sequence and a quality checklist covering size, thickness, fastening and joining, installation and finish
  • One diagnosed defect: what is wrong, its cause, the correction and the evidence recorded

Rubric

CriterionMeets the standard when
MethodThe method matches the form: radial line only for a right cone or frustum, triangulation for a transition, with the reason stated.
LengthsSlant heights and true lengths are used, never vertical heights or plan lengths, and the arc or TLD check is shown and agrees.
JointThe joint suits the metal and thickness under the cited specification: no solder on aluminum, seams made in the direction of the flow.
InstallationEvery lap sheds water: hood over sleeve, flashing carried over the cricket at the up-slope side; the code or specification trigger for a cricket is cited.
EvidenceThe maker checks needed are named (Petersen's separate print approval for a non-90 miter; consulting the maker, as Drexel's guide specification says, for radius work), and the checklist and defect record are dated and complete.

Module quiz

10 questions drawn from a bank of 26; a new set each attempt. Pass mark 80%.

1. When both sides of a coping peak rise at the same slope, how does the joint line stand?
2. Which of these must exposed metal be free of at completion under UFGS 07 60 00?
3. Which OSHA standard applies to construction work where an employee may be occupationally exposed to lead, such as from lead-bearing solder?
4. In UFGS 07 60 00's two-piece housing option for a single pipe vent, how far does the metal hood lap down over the sleeve at minimum?
5. Under the IRC text as reproduced in the 2021 Seattle Residential Code, a chimney wider than what, measured perpendicular to the slope, needs a cricket?
6. In the case study, why does the 36 in chimney need a cricket?
7. What happens to a square to round laid out with plan lengths instead of true lengths?
8. Above what aluminum thickness does UFGS 07 60 00 call for welding?
9. How long is the stretch-out arc of a radial line cone pattern?
10. At a 90 deg corner, a 12 in coping meets a 16 in coping. At what angle from its long edge is the 12 in piece cut?