Strip foundations can form part of an efficient home when ground, loads, water control and thermal detailing are coordinated. Foundation type alone does not determine heat loss.
Ground and structure
The structural engineer determines geometry from investigation and loads. This guide does not specify depth, reinforcement or capacity.
Thermal envelope
Show how floor insulation meets the wall and plinth. A massive element between layers can create a heat path absent from a clear-floor calculation.
Water and drainage
Surface runoff, groundwater and capillary control are separate issues. Do not specify drainage without establishing discharge and maintenance arrangements.
Service entries
Coordinate penetrations with structure and sealing before construction. Late drilling can damage the structure or control layers.
Common mistakes
A generic detail without levels and ground adaptation conceals risk. Inspect plinth insulation, waterproofing and actual levels before backfilling.
| Item | Parameter | Check / result |
|---|---|---|
| Strip | Structure | Calculation |
| Plinth | Heat + water | Detail |
| Entries | Penetrations | Coordination |
What this means for your project
Compare strip and raft options using the same site data. Request a section showing continuous thermal, air and water control.
Sources and scope of review
- PNNL — Energy Renovations: Insulation
- PNNL / Building America — Moisture control for residential buildings
Related reading
- Insulated Raft Foundation: When It Makes Sense
- The Thermal Envelope: How to Define It Correctly
- Thermal Bridges: Where They Occur and Why They Matter