Material takeoffs and quantity reconciliation
How a drawing set and schedule become runs, pieces, strips, sheets, pounds and accessory counts, what fixes those numbers, a nine-step worked example, and the checks that find a defect before it reaches the shop.
4 lessons · about 46 min · 12 diagrams · 0 videos
Version 1.0.0
Builds on these modules
Lessons
0 of 4 complete
Lesson 1 · 10 min · 10 slides · 7 questions
Material takeoffs and quantity reconciliation: principles and terminology
What a takeoff is and is not, the vocabulary of runs, pieces, girth, strips and sheets, the five quantities that are never mixed, how a schedule is read, and who uses the numbers.
You will be able to: Define takeoff, run, piece, girth, strip, sheet, net and gross; say what a takeoff contains and does not contain; and trace one number from a drawing schedule to the shop.
Not startedStart →Lesson 2 · 12 min · 11 slides · 9 questions
Material takeoffs and quantity reconciliation: materials, standards and design constraints
How the 48 in sheet turns a girth into strips, AFS's standard and maximum piece lengths, what Drexel and Petersen print for lengths, cleats, nails and splice plates, mill widths, gauge and weight, drawing units, and where SMACNA fits.
You will be able to: Name what fixes the numbers in a takeoff: the 48 in sheet, strips per sheet, AFS's two piece lengths, a manufacturer's stock lengths and accessories, gauge and weight, drawing units, and where standards fit.
Not startedStart →Lesson 3 · 13 min · 12 slides · 8 questions
Material takeoffs and quantity reconciliation: methods and worked application
The nine-step method on an example job: runs and units, a stated piece basis, girth and strips per sheet, packing the sheets by width, where the extra metal goes, weights, accessories, the flat allowance, six checks, and who reads, measures and confirms.
You will be able to: Carry an example job from schedule to pieces, strips, sheets, pounds and accessory counts in nine steps, state the assumptions behind each number, and run six reconciliation checks.
Not startedStart →Lesson 4 · 11 min · 12 slides · 6 questions
Material takeoffs and quantity reconciliation: defects, verification and case study
Nine takeoff defects with their checks and corrections, among them a wall height read as a flashing leg, a double count, a wrong unit scale, a count rounded down, a sheet count from area, and a girth with the wrong hem, plus what a reviewer should be able to rebuild.
You will be able to: Diagnose a takeoff defect from its symptom, name its cause, choose the check that proves it and the correction, and document evidence a reviewer can rebuild.
Not startedStart →
Practical task
Produce a takeoff job packet for an invented set of three flashing runs (one 24 ga galvanized profile, a second profile and a cleat, each with a stated run in feet): state the piece basis, work girth, strips, sheets, weight and accessory counts from sourced numbers, run the six reconciliation checks, and then reconcile a second figure, a measured run, against the typed one.
Hand in
- A decision rationale: the schedule rows used, the units, the piece basis chosen (10 ft standard or 126 in maximum) and why, with each source named
- A marked-up detail or section for each profile showing its legs, with the girth added up and the leg dimensions taken only from dimensions on the flashing itself
- Material and measurement assumptions: run in inches, material and gauge exactly as the schedule states them (or "not specified"), the girth basis (drawn legs or legs plus hem allowance), the weight per square foot and its source
- A calculation sheet: pieces per run, strips per sheet for each girth, sheets packed by width for each material and gauge, net and gross area and weight, and accessory counts with the manufacturer rule used
- A quality checklist with the six reconciliation checks completed and any gap explained
- A defect analysis for one seeded error (a wall height read as a leg, a run counted twice, a wrong units code, or a count rounded down): symptom, cause, the check that proves it, the correction and the evidence it now passes
Rubric
| Criterion | Meets the standard when |
|---|---|
| Sources | Every value names its owner: an AFS register for AFS limits, girths and weights; a manufacturer's guide for its own lengths, cleats, nails and splice plates; the drawing for runs and units. |
| Piece basis | The packet states which piece length it counted on, shows the division and the round-up, and keeps the short remainder piece in the count. |
| Girth and strips | Each girth is the sum of leg lengths from dimensions on the flashing, is checked against the 48 in sheet, and gives strips per sheet by rounding down. |
| Packing | Strips are packed by width for each material and gauge, the sheet count is checked against the width minimum, and the area-only count is shown as a check, not used to order. |
| Weight and accessories | Weight is area times the register weight per square foot, labelled a planning weight; accessory counts follow the manufacturer rule quoted and are checked against its parts list. |
| Reconciliation | All six checks are shown with numbers, a second independent figure is reconciled with the first, and every gap has a written cause. |
| Defect analysis | The defect is described as symptom, cause, check and correction, with the evidence that the corrected number passes. |
| No assumptions or prices | Nothing the drawing does not state is guessed, no blank is a zero, and no price or dollar figure appears anywhere in the packet. |