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Work · Guided lesson

Audit a revised room and explain system deltas

About 17 minutes · 3 reading + 14 practice and checks
Time includes reading, practice, and questions. Extra videos or further study are optional.
See this course’s project requirements

A checked paper finish takeoff with rooms/openings, net surface areas, specified coverage and waste rules, whole-package quantities and drawing revision impacts.

Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.

What to include

  • Save the finish matrix and rule dictionary before quantities; include the original-case decision evidence and a separate changed-case result.
  • Save three wall rows with rule-specific deduction columns; include the original-case decision evidence and a separate changed-case result.
  • Save flooring takeoff with separate allowance quantities; include the original-case decision evidence and a separate changed-case result.
  • Save three material requirements with units and source rules; include the original-case decision evidence and a separate changed-case result.
  • Save net-order ledger and leftover check by material; include the original-case decision evidence and a separate changed-case result.
  • Save multi-room finish packet with revision/add-deduct reconciliation; include the original-case decision evidence and a separate changed-case result.

Review and revise

Use these criteria to check your work and choose what to improve.

  • The final packet uses the supplied task-specific constraints and all six records agree.
  • Every result can be traced to an identifier, input, calculation or stated decision rule.
  • Changed-case practice updates dependent records and keeps holds or uncertainty visible.
  • The packet states the learner role, authority boundary and specific next verification needed before real work.
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Before you begin

The idea in everyday life

Original fictional workplace practice; paper or a local document is sufficient. The rules and records below are supplied for this exercise, not asserted universal workplace policy. Larch rev 2 changes room 103 wall P1→P2, gross 40/doors 2/windows 3 unchanged. Thus 103 net P2=38 m²rather than old P1 net 35. New P1=101 only 50 m²; new P2=48 m² from room 102 + 38 m² from room 103 = 86 m². Floors unchanged. P1 two finish coats/rate 10; P2 three/rate 12.

The idea

A revision should trace changes from room code through deductions, coats, material totals and orders; the final quantity alone hides whether the right rule changed.

Follow along

Audit a revised room and explain system deltas — worked practice

A revision should trace changes from room code through deductions, coats, material totals and orders; the final quantity alone hides whether the right rule changed.

Larch rev 2 changes room 103 wall P1→P2, gross 40/doors 2/windows 3 unchanged. Thus 103 net P2=38 m²rather than old P1 net 35. New P1=101 only 50 m²; new P2=48 m² from room 102 + 38 m² from room 103 = 86 m². Floors unchanged. P1 two finish coats/rate 10; P2 three/rate 12. Use paper or a local document. Preserve the original case and make a separate changed-case record.

  1. 1. Step 1

    Apply the new 103 system deduction rule.

    You should see: P2 deducts only doors:40−2=38 m².

    Keep the stated identifier, unit and policy alongside this result so another reader can check it.

  2. 2. Step 2

    Reaggregate systems without carrying old 103P1.

    You should see: P1: 50 m²; P2: 86 m².

    Keep the stated identifier, unit and policy alongside this result so another reader can check it.

  3. 3. Step 3

    Recalculate finish litres separately.

    You should see: P1 finish 50×2/10=10L; P2 finish 86×3/12=21.5L.

    Keep the stated identifier, unit and policy alongside this result so another reader can check it.

  4. 4. Step 4

    Save multi-room finish packet with revision/add-deduct reconciliation.

    You should see: P1 finish decreases 7L; P2 increases 9.5L; floor ledger unchanged; primer and orders need their dependent updates.

    Keep the stated identifier, unit and policy alongside this result so another reader can check it.

Now change one thing

Rev2 also changes 103 gross wall area from 40 to 44, other inputs unchanged. What is revised total P2 net wall area?

Your work

What to finish

Save multi-room finish packet with revision/add-deduct reconciliation; include the original-case decision evidence and a separate changed-case result.

Common mistake

Watch for this

Relabeling a room’s finish while keeping the old deduction, coat, subtotal or purchase requirement.

How can I tell I understand it?

Using the supplied identifiers, I can save multi-room finish packet with revision/add-deduct reconciliation. My changed-case record names the revised condition and explains which dependent decision it changes.

Try 3 questions

Quick knowledge check

Answer all 3 questions. Get at least 2 right and the lesson completes automatically.

Not yet passed

You’ll get an explanation for each answer. Signed in? Your results save to your account.

1Why does Larch 103 net change from 35 to 38 after P1→P2?
2What is revised Larch P2 net wall total?
3What Larch record must remain unchanged under wall-only rev 2?
0 of 3 answeredApply the lesson to a short question, then review the explanation.
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Finish this lesson

Pass the check. We’ll save the progress.

Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.

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Sources and further reading

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13-1051.00 - Cost Estimators
Source & access notes · checked 2026-10-01

Occupational task and responsibility context; the exercise policies and quantities are original fictional inputs. Page title and relevant content inspected; no interactive controls or credential process tested.

Access: Readable official page retrieved with the web reader on 2026-10-01.

Reuse: All teaching cases, data, worked steps and questions are original. Link and limited paraphrase for context; no copied source exercises.

17-3011.00 - Architectural and Civil Drafters
Source & access notes · checked 2026-10-01

Occupational task and responsibility context; the exercise policies and quantities are original fictional inputs. Page title and relevant content inspected; no interactive controls or credential process tested.

Access: Readable official page retrieved with the web reader on 2026-10-01.

Reuse: All teaching cases, data, worked steps and questions are original. Link and limited paraphrase for context; no copied source exercises.

Cost Estimating | WBDG - Whole Building Design Guide
Source & access notes · checked 2026-10-01

Public agency or educational context; no source exercises are copied and no simulated threshold is presented as an official rule. Page title and relevant content inspected; no interactive controls or credential process tested.

Access: Readable official page retrieved with the web reader on 2026-10-01.

Reuse: All teaching cases, data, worked steps and questions are original. Link and limited paraphrase for context; no copied source exercises.

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