Construction Proof Input Form
Formula Used
The calculator builds a weighted proof strength score from logic, evidence, risk, cost, time, and approval readiness.
- Logic Ratio = Validated Steps ÷ Total Steps × 100
- Evidence Ratio = Complete Evidence ÷ Total Evidence × 100
- Risk Adjustment = 100 − Risk Score × 10
- Cost Adjustment = 100 − limited cost penalty
- Time Adjustment = 100 − limited delay penalty
- Proof Strength = Logic 30% + Evidence 25% + Risk 20% + Cost 10% + Time 5% + Approval 10%
This model supports construction review. It does not replace licensed engineering judgment or local code approval.
How To Use This Calculator
- Enter the project name, proof type, and reviewer name.
- Add the total number of proof steps.
- Enter how many steps have been validated.
- Add evidence counts, risk score, cost impact, and time impact.
- Write statements in the claim column.
- Write matching reasons in the reason column.
- Press the calculate button.
- Review the result, chart, CSV, and PDF export.
Example Data Table
| Step | Construction Claim | Reason Or Evidence | Status |
|---|---|---|---|
| 1 | Footing depth matches approved drawing. | Survey level and drawing F-102 confirm depth. | Validated |
| 2 | Rebar cover follows specification. | Spacer blocks and inspection photos support cover. | Validated |
| 3 | Concrete strength is acceptable. | Test cylinder report is attached. | Pending |
| 4 | Change does not delay critical path. | Updated schedule shows four float days. | Validated |
Construction Two Column Proof Guide
Purpose
A two column proof helps a construction team explain a decision. The left column lists each claim. The right column gives the reason, document, measurement, code note, or inspection record that supports it. This format is simple. It is also useful during approvals, disputes, change reviews, and site meetings.
Why It Matters
Construction work depends on clear evidence. A supervisor may say that a beam is correct. A client may ask why. The proof should show the drawing reference, site measurement, material record, and inspection result. When every claim has a reason, the review becomes faster. The calculator scores that readiness.
Proof Strength
The score uses several factors. Logic completion checks how many steps are validated. Evidence strength checks missing support. Risk adjustment lowers the score when field risk is high. Cost and time adjustments show possible project impact. Approval weight adds management confidence. Together, these values create a practical proof strength result.
Site Use
Use the tool before sending a request for information, variation, inspection note, or change order. Enter all important steps. Match every claim with a reason. Keep wording short. Add evidence from drawings, specifications, delivery notes, photos, test reports, and site diaries. Then review weak areas before submission.
Better Decisions
A high score means the proof is organized and supported. A low score means the proof needs more evidence or less risk. The result does not approve the work by itself. It helps teams prepare a cleaner record. This improves communication between engineers, contractors, consultants, and clients.
FAQs
1. What is a two column proof in construction?
It is a structured table. One column shows claims. The other column shows reasons, records, or evidence. It helps teams prove that a construction decision is logical, supported, and ready for review.
2. Can this calculator approve construction work?
No. It supports review and documentation. Final approval should come from the responsible engineer, consultant, client, authority, or qualified project reviewer.
3. What does proof strength mean?
Proof strength is a weighted score. It measures validated steps, evidence quality, risk, cost impact, delay impact, and approval readiness.
4. What evidence should I include?
Use drawings, specifications, inspection reports, test results, site photos, delivery notes, calculations, measurements, permits, and approved method statements.
5. Why does risk reduce the score?
Higher risk means the proof needs stronger support. Safety, quality, legal, and schedule risks can weaken an otherwise logical construction proof.
6. Can I use this for change orders?
Yes. It works well for change orders. List the change claim in one column. Add drawings, instructions, cost notes, and time reasons in the other column.
7. Why are cost and time included?
Construction decisions often affect budget and schedule. Cost and time inputs help show whether the proof has commercial and planning impact.
8. What score is considered good?
A score above 85 is excellent. A score from 70 to 84 is strong. Lower scores usually need better evidence, fewer gaps, or risk reduction.