Passive
The same cold path closed from outside on a house already standing. The perimeter is excavated to expose the slab edge, rigid insulation that does not mind moisture is fixed against it, and whatever is left above ground is capped and covered. Heavy work, but it does not need the house rebuilt.
One of 4 ways to meet Thermal bridging elimination. Build 2/4, Upkeep 4/4, Efficiency not rated. Cost, carbon and footprint below are rated against those 4, not in absolute terms.
Room to dig around the perimeter, and ground that can be opened without undermining the foundation or cutting buried services
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Every option in this sub-function, with the value on each axis and a note on what drives it (this solution highlighted):
| Solution | Build skill | Upkeep burden | Efficiency |
|---|---|---|---|
| Continuous exterior insulation detailing | Basic | 1 | N/A |
| Strapped straw external insulation (ITE paille sanglee) | Intermediate | 2 | N/A |
| Insulated slab edge and slab-to-wall thermal break | Intermediate | 0 | N/A |
| Exterior slab-edge insulation (retrofit) | Intermediate | 3 | N/A |
Build skill and upkeep burden are proxies (lower burden = simpler to maintain); the efficiency column is this sub-function’s ranking, 1 = best. “N/A” where an axis isn’t rated here.
No build tutorial recorded yet.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.