Acrylic pool window engineering 101 - thickness, sealing and sign-off
How thick does your pool window need to be, who signs it off and what edge-bonding system actually lasts in chlorinated water.
A clear acrylic pool window is one of the highest-impact features on a luxury build - and one of the easiest to get wrong. Get the engineering right up front and the install is straightforward; get it wrong and the pool ends up empty.
Sizing the thickness
Pool window thickness scales with the smaller of the two panel dimensions and the head of water above the panel. As a rule of thumb: 50 mm cast acrylic for panels up to 1.0 m square with under 1.5 m head; 75 mm for panels up to 1.8 m wide with up to 2.0 m head; 100 mm for anything larger or deeper.
Every panel must be signed off by a structural engineer. We supply factory calculations and CAD on every order to make that sign-off straightforward.
Bonded vs framed edges
Framed installations clamp the panel between stainless steel angles with a structural EPDM gasket. Reliable, serviceable, but visually heavier.
Bonded installations cast the panel directly into the concrete with a two-part structural sealant (typically Sikaflex 1cSL or equivalent). Cleaner aesthetics, more demanding install.
Chlorine, UV and the 30-year window
Cast acrylic is essentially inert to chlorinated pool water and UV-stable for 30+ years if specified with a UV-resistant casting resin. Always confirm the resin grade with your supplier - generic cast acrylic without UV inhibitors yellows visibly within a decade.