What is a friction stay and why does it matter? Here's a plain explanation.
A friction stay is the hinge arm that lets a casement window swing open and — crucially — holds it at whatever angle you leave it, rather than swinging free in the wind. The friction in the mechanism is what does that.
Friction stays are a quiet quality marker. A cheap stay under-sized for the sash sags within a couple of years, and then the window drops and won't seal. We size them to the sash weight.
The hinge arm on a casement window that lets it swing open and holds it at whatever angle you leave it, rather than swinging free in the wind.
Usually because they were under-sized for the sash's weight — the stay sags, the window drops, and it stops sealing properly.
Indirectly but importantly — a sagging stay drops the sash out of alignment, and then multi-point locking can't pull it tight against the gaskets.
Related guides covering this topic from other angles — different products, applications, or contexts.
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