Penetrations, curbs, skylights and equipment
The terms, materials and order of work for flashing pipes, equipment curbs and skylights, which document sets each dimension, and how to inspect and record the finished detail.
4 lessons · about 33 min · 7 diagrams · 6 videos
Version 1.0.0
Related Academy lessons
Lessons
0 of 4 complete
Lesson 1 · 7 min · 7 slides · 5 questions
Penetrations, curbs, skylights and equipment: principles and terminology
The vocabulary of roof penetrations and equipment curbs, the code duty to flash roof openings, when a cricket is required, and why a skylight is a fall hazard before it is a flashing job.
You will be able to: Define curb, base flashing, counterflashing, cap flashing, rain collar, pitch pocket and cricket, say where each belongs, and state the fall-protection duty at a skylight or roof opening.
Not startedStart →Lesson 2 · 7 min · 8 slides · 5 questions
Penetrations, curbs, skylights and equipment: materials, standards and design constraints
Which metals and thicknesses the published details call for, how the 8 inch, 4 inch and 18 inch figures differ by source, and how to keep unlike metals apart.
You will be able to: Name the metal minimums published for penetration flashings, tell which document each height or lap comes from, and explain why the governing document, not a remembered number, sets the dimension on a job.
Not startedStart →Lesson 3 · 10 min · 11 slides · 6 questions
Penetrations, curbs, skylights and equipment: methods and worked application
The layers at an equipment curb, a pipe and a standing seam panel, when a pitch pocket is the last resort, and two worked examples that size a pocket side piece and a curb run.
You will be able to: Choose a curb, collar, boot or pocket for a penetration, put the layers in the right order for a curb or a pipe, and work out the girth and piece count for the metal with every input labelled.
Not startedStart →Lesson 4 · 9 min · 11 slides · 5 questions
Penetrations, curbs, skylights and equipment: defects, verification and case study
The defects that let water in at penetrations, a checklist that ties each check to its source, and two cases: a real skylight fall report and a hypothetical leak worked through the checklist.
You will be able to: Spot the common defects at a curb, pipe, pocket and skylight, check a finished detail against a source-labelled checklist, record the evidence with photographs, and explain the skylight fall in the Washington report.
Not startedStart →
Practical task
Produce a job packet for one rooftop-unit curb and one pipe on a low-slope roof: name the governing documents, mark up a section sketch of the curb and the pipe, work out the girth and piece count of the metal, and list the checks you would make with the source of each.
Hand in
- A one-page list of the governing documents for the job (specification, owner standard, roof maker, equipment or skylight maker, locally adopted code) and which dimension each one sets
- A marked-up section sketch of the curb and the pipe with heights, laps and clearances labelled with the document each comes from
- A girth and piece-count calculation for the counterflashing, with every input and assumption written down and checked against the AFS limits
- An inspection checklist with a photo list, and an analysis of one defect you could expect, with the corrective option
Rubric
| Criterion | Meets the standard when |
|---|---|
| Governing documents | Names the documents that apply and does not present one maker’s or one owner’s number as a code rule. |
| Sketch | Shows base flashing under counterflashing, an upslope diverter or cricket where the width or roof type calls for one, and a pipe collar with clearance, flange and rain collar, each dimension labelled with its source. |
| Calculation | Adds the legs and the hem allowance to a sharp-corner girth, checks it against the 48 in girth and 126 in piece limits, and states the assumptions. |
| Inspection | Lists checks for height, lap, fasteners, sealant, diverter, pocket condition, metal contact and skylight protection, each tied to a source. |
| Safety | States how skylights and roof openings are protected before the work starts, citing 29 CFR 1926.501(b)(4). |