What this tool does

Edits the ψ-value, reference and source of any thermal bridge across a site's Elmhurst SAP XMLs, and splits bridges where part of a junction uses a different product — e.g. 4m of a 12m lintel run switching to Hi-therm. Only the Thermal Bridges block is rewritten; everything else in each file is preserved byte-for-byte.

Steps

1. Load — Load site folder… (or drag files/folders anywhere on the page; the ▾ offers individual files). Every bridge appears as a length bar with its junction (E02, P01…), length, ψ and reference, grouped by house type — identical bridges across plots collapse into one card.
2. Click a bridge to edit — type the new ψ and reference (previously used references are suggested as you type). Apply to every plot of the house type, or untick the plots to leave alone.
3. Split — the Split button on a card. Add a part, give it its own ψ + reference, set its length. For lintels, sills and jambs you can tick the actual windows covered and the length fills in from their widths/heights. The original keeps the remainder.
4. Review changes — per-plot Σψ·L before → after and a length check (split parts must sum exactly to the original).
5. Save — Save updated XMLs writes only the changed files into a folder you pick; the ▾ next to it downloads a zip for Elmhurst instead.

Views

By house type is the working view — one card per bridge per house type. By junction groups the whole site by junction and then by ψ-value / reference (not length), so you can see at a glance where e.g. two different lintel ψs are in play and edit all matching bridges at once. By plot shows every bridge individually. The window junctions box narrows to lintels, sills and jambs, and shows each house type's window-derived lengths alongside the entered ones for reference.

Window junction lengths

Lintel and sill lengths derive from window widths; jambs from 2 × height — each times the opening count. Doors are included for lintels and jambs but excluded from sills by default (tick them in the picker to override). Rooflights are left to their separate R junctions. Derived totals are shown for reference only — the tool never forces them to match.

Y-value

Check on first re-import: this tool does not touch ThermalBridgesYvalue. Your files use CalculateBridges, so Elmhurst should recalculate the Y-value from the edited bridge list when the file is re-imported — double-check the first one. If Elmhurst keeps the stale value instead, come back to us and we'll write the recalculated value directly.

Privacy

No data leaves your laptop — files are processed entirely in the browser.