Pool type
Structural engineering for indoor pools, including interaction with the surrounding building structure.
In shortAn indoor pool is a structural problem about two structures, not one — the pool and the building interact through shared ground, shared slabs and differential movement, and that interaction is what the engineering has to resolve.
An indoor pool sits inside or beneath a building, which means the pool structure and the building structure share the same ground and often touch. The engineering question is how they interact: whether the pool loads reach the building footings, whether the two will settle at different rates, and how the junction between them is detailed so that movement in one does not crack the other.
Where the pool is excavated adjacent to existing footings — common in a retrofit into an existing home — the excavation can remove the support those footings depend on. That is assessed before work starts, and resolved through staged excavation, temporary support, retaining or underpinning as the site requires.
Where the pool is not on the ground at all but on a suspended slab — above a basement, garage or lower level — the supporting structure carries the full water load permanently. Water is roughly a tonne per cubic metre, so this is a substantial and unusual load for a residential slab. The slab is designed or verified for it, including deflection, not just strength.
A pool shell and a building frame respond differently to load, moisture and temperature. Where they meet, the detailing has to allow that difference rather than lock the two together and let the weaker element crack.
Our scope is structural. Waterproofing systems, ventilation, dehumidification and condensation control are critical to an indoor pool and are handled by other consultants — we coordinate with them, but we do not design them.
FAQs
Often yes, but it is a structural project involving the existing building, not just a pool. The existing footings, slab and any structure over the excavation have to be assessed first.
Only where the supporting structure is designed or verified for the load. A full pool is a heavy, permanent, concentrated load, and deflection matters as much as strength — a slab that is strong enough can still sag more than the pool finishes tolerate.
No — those sit outside structural scope and are designed by specialists. We provide the structural design and coordinate with the consultants handling the rest of the build.
Send your plans or site details and get a structured, itemised quote.
