Dimension Closure — Front vs Back Totals Should the total dimension on the front side of a plan match the total dimension on the back side so that exterior dimensions close properly and the building size is consistent on all elevations?

Introduction / Context:
Dimension sets must close around the building so that overall sizes are consistent across elevations and sections. If the total dimension on one side differs from the opposite side, the plan will not reconcile, causing conflicts in framing, facade elements, and site coordination.

Given Data / Assumptions:

• Exterior dimension strings are controlled to common datums, often exterior face of framing.
• Openings, jogs, and projections are included consistently.
• Drawings reference the same grid and datum across sheets.

Concept / Approach:
Closure means the sum of segment dimensions equals the overall. Matching front and back totals confirms that geometry is consistent and that the plan has not accumulated rounding or transcription errors. Closure also aids in site layout where opposing control lines must locate foundations accurately.

Step-by-Step Solution:
1) Establish overall building width and set it as a control dimension.2) Build chained segments and confirm their sum equals the overall.3) Repeat on the opposite side and compare totals.4) Resolve any discrepancy by correcting segment values or datum references.

Verification / Alternative check:
Overlaying elevations or using CAD constraints shows whether front and back totals align. Clash detection between structure and envelope is reduced when closure is enforced.

Why Other Options Are Wrong:
Incorrect ignores the necessity of closure. Size based qualifiers such as small houses or commercial projects are irrelevant because closure is universal. Only check interior strings misses that exterior control drives many dependent dimensions.

Common Pitfalls:
Mixing dimension baselines; rounding fractional inches inconsistently; omitting small projections that change totals.

Final Answer:
Correct