The decision question
What window, hardware, drop, return, and overlap measurements are established before a selected curtain system is ordered?
This owner records the complete measurement set and selected-system allowances; it does not choose hardware, anchors, fullness, products, or claim blackout performance.
Collect the required inputs
| Input | Required? | Unit or format | Evidence source |
|---|---|---|---|
| Window ID and unit system | Required | Named window; mm or in | Room observation |
| Opening, trim, and wall dimensions | Required | Width and height at named points | Measure the actual window area |
| Mount datum and surface | Required | Wall or ceiling; dimensioned reference | Room observation |
| Rod or track and hardware origin | Required | Exact selected system and source | Official selected-system documentation |
| Left, center, and right drop | Required | Three dimensions from one datum | Measure at the actual hanging line |
| Obstructions, return, and overlap | Required | Dimensioned notes; maker allowance kept separate | Observation plus selected-system documentation |
Apply the route-specific decision logic
- Record raw room measurements before adding any system allowance.
- Use one unit system and one named mount datum.
- Branch by wall or ceiling mount and by rod or track.
- Derive an order dimension only when the selected-system source states the applicable allowance.
- Assign PASS only when every used allowance has a source and no required dimension is unresolved.
Reader states: PASS means all required facts support the result. BLOCKED means a recorded conflict stops the plan. VERIFY identifies a named measurement or document that can settle the row. UNKNOWN means the needed fact is not established. NOT_APPLICABLE means the row is outside this exact branch.
Complete the window, hardware, drop, return, and overlap measurement table
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Evidence boundaries
The IKEA Window Solutions Buying Guide separates observed window measurements from system-specific measuring guidance; apply its dimensions only within the named system scope.
The Kirsch traverse-rod instructions depict named traverse-system hardware and return mechanics; they do not establish a universal return or overlap.
Do not infer: Exact order allowances, return, overlap, fullness, projection, hardware compatibility, and blackout performance remain UNKNOWN until the selected system documents them.
Use the completed record
This owner records the complete measurement set and selected-system allowances; it does not choose hardware, anchors, fullness, products, or claim blackout performance.
- Continue with measuring sequence when that separate decision is needed.
- Continue with trim and return obstruction record when that separate decision is needed.
- Continue with width and overlap planning when that separate decision is needed.