Many uPVC frames have steel inside. Here's what reinforcement is and why it matters.
A galvanised steel insert runs inside the uPVC profile to carry load and keep larger frames rigid against the weight of sash and glass, and against wind pressure.
Reinforcement is invisible in the finished window, so cheap work sometimes skips it — which shows later as sagging or sticking. We specify it by size when we fabricate.
A galvanised steel insert inside the profile that keeps larger frames rigid against sash, glass, and wind loads.
Larger sliders, doors, and wide casements; it's sized to the span.
It stops larger frames sagging or sticking over time. It's hidden, so cheap work sometimes skips it — we don't.
Related guides covering this topic from other angles — different products, applications, or contexts.
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