An acrylic pool panel is a structural element, not a sheet of plastic. Before PRUVA fabricates any panel, its exact geometry and loads are analysed with Finite Element Analysis — so thickness, deflection and safety factors are engineering facts, not estimates.
What is Finite Element Analysis?
Finite Element Analysis (FEA) is the standard engineering method for predicting how a structure behaves under load. The panel is divided into thousands of small elements — a mesh — and the physics of water pressure, support conditions and material behaviour are solved for every element simultaneously.
The output is a complete picture of the panel before it exists: where stress concentrates, how far the panel will deflect at full water load, and how much reserve capacity remains beyond the worst expected case.
Why acrylic pools need FEA — every time
Water is unforgiving: every metre of depth adds roughly a tonne of pressure per square metre, permanently, for decades. Unlike a beam in a building, an acrylic panel is also expected to stay optically perfect while carrying that load — visible deflection or stress crazing is a failure even when nothing breaks.
Generic thickness tables cannot capture a real project: panel span, support detail, rebate geometry, temperature range and bonding joints all change the result. That is why every PRUVA panel — flat, L-shaped or curved — is analysed for its exact configuration rather than sized from a chart.
The PRUVA engineering workflow
The report travels with the project — from authority approvals to the final warranty file.
What the analysis actually checks
Three behaviours decide a panel. Stress: peak values must stay far below the material limit everywhere, including corners and rebate edges where concentration occurs. Deflection: the panel must stay visually flat at full load — the optical standard is stricter than the structural one. Creep: acrylic under permanent load deforms slowly over years, so the analysis is run for decades of service, not for day one.
Safety factors are then applied on top of all three, so the specified thickness carries comfortable reserve beyond the worst calculated case.
From analysis to a real panel thickness
The result of the FEA is a precise specification: panel thickness, edge and rebate dimensions, support requirements and — for bonded assemblies — the joint positions and bonding procedure. A compact plunge pool window may resolve to 60mm; a deep full-height wall may demand 250mm or more. The point is that the number is derived, not assumed.
This specification is what the fabrication team builds to, what the installation team seals to, and what the inspection at handover is measured against.
The panel you see is transparent.
The engineering behind it should never be.
What clients and consultants receive
Every PRUVA project includes the engineering documentation to prove the panel is right: the FEA report with stress and deflection results, the panel and rebate specification, material certificates, and the bonding and annealing records for assembled panels. For rooftop and elevated projects, this documentation also supports structural approvals.
If you are comparing contractors, ask each one a simple question: can you show me the FEA report for my panel? The answer tells you most of what you need to know.
Quick answers
What is FEA in acrylic pool design?
Finite Element Analysis is a computational method that predicts how an acrylic panel behaves under water pressure — stress, deflection and long-term creep — before it is fabricated. PRUVA performs FEA in-house for every structural panel.
How is acrylic pool panel thickness calculated?
Thickness is derived from FEA of the exact panel: water depth, span, support and rebate detail, temperature range and safety factors. Typical results range from around 60mm for small windows to 250mm+ for deep full-height walls.
Why does creep matter for acrylic panels?
Acrylic under permanent load deforms slowly over years. A panel sized only for day-one loads can deflect visibly over time — which is why PRUVA runs the analysis for decades of service life, not just the initial condition.
Should I ask my contractor for an FEA report?
Yes. A credible structural acrylic contractor can show the FEA report for your specific panel, including stress and deflection results and the applied safety factors. If no report exists, the thickness is a guess.