Every reusable asset, in one index
9 original SVG diagrams, 11 datasets totalling 1,467 rows in CSV and JSON, 4 embeddable charts, 11 interactive worksheets, and 4 decision-support components. All authored here, all internally linked, all licensed CC BY 4.0 for reuse with attribution.
Diagrams (SVG)
| Asset | Type | What it teaches |
|---|---|---|
| Sub-slab depressurization system | system diagram | How an active system moves soil gas out of the house rather than filtering the air inside it. |
| Foundation types and soil contact | foundation | Why foundation type drives both the mitigation design and the price, and why a crawl space raises a quote. |
| Stack effect and soil-gas entry | airflow | Why radon enters a heated house at all, and why winter readings run higher than summer readings. |
| What to do with a radon result | decision tree | That the first question is test validity, not the number — where most disputed results actually resolve. |
| Radon sequence in a transaction | timeline | Why radon runs out of days in a contract window, and which stages are fixed rather than negotiable. |
| Testing methods by duration and evidence | comparison | That duration and evidentiary strength are separate axes — and only one method documents its own conditions. |
| Where a radon fan may and may not be mounted | system diagram | Why fan location is a safety decision rather than a convenience one, and how to check yours by looking at it. |
| The mitigation lifecycle, from diagnosis to re-verification | timeline | That installation is one day in the middle of the process rather than the end of it. |
| The annual maintenance check, item by item | comparison | What to look at once a year, what normal looks like for each item, and which single observation matters most. |
Datasets (CSV, JSON, embeddable chart)
Interactive worksheets
- Radon Result Interpreter — What Your Number Actually Means — Your number, read against guidance and against the conditions it was measured in.
- Should I Retest for Radon? — Trigger Checker — Time since the last test, plus what has changed in the house — the two things that decide it.
- Is My Radon System Working? — Diagnostic Sequence — The safe checks, in order, and where they stop.
- Radon Quote Comparison Worksheet — Why Two Bids Differ — Review both bids on the eight lines that explain almost every price gap.
- Radon in a Home Sale — Decision Tool for Buyers and Sellers — Your side, your timeline, your result — and what should be in the amendment.
- Radon Testing Timeline Generator — Fit a Test in Your Window — Work backwards from your deadline to the day conditions have to start.
- Should I Test My Home for Radon? — Decision Tree — Five reasons to test, and which one applies to you.
- Should I Mitigate? — Radon Decision Tree — Above the action level it is recommended. In the 2–4 band it is your call, and this shows what tips it.
- Should I Negotiate After a Radon Inspection Finding? — Decision Tree — Which ask is realistic given your side, your days, and what you have in writing.
- Do I Need Another Contractor Opinion? — Decision Tree — Five situations where a second opinion pays for itself, and one where it does not.
- Should I Repair or Replace My Radon Fan? — Decision Tree — Four different problems present the same way. This separates them.
Decision-support components
Reusable reference blocks rendered across multiple pages: the result interpretation table, the post-mitigation troubleshooting path, the home-sale timeline, and the passive-system activation checklist. Each appears wherever it improves understanding rather than everywhere it would fit.
- radon system not working — troubleshooting path
- post mitigation retest failed — troubleshooting path
- radon test false positives — result interpretation
- weather and radon readings — result interpretation
- when to retest for radon — result interpretation
- who pays for radon mitigation — home sale timeline
- selling a house with an existing radon system — home sale timeline
- failed radon test during inspection — home sale timeline, result interpretation
What is deliberately absent
No stock photography, no decorative illustration, and no infographic that restates a table more slowly. Every asset here is educational or it is not published — and no asset depends on a third-party CDN, which is why they all still work offline and in print.
Related
- Diagram library — every SVG rendered at full size.
- Research Center — datasets with methodology.
- Interactive tools — the worksheets in use.
- Research library — every source behind them.
Get quotes from credentialed local contractors
Free to request and no obligation. We verify credentials with the issuing authority before any request routes to a contractor.