How a window locks affects both security and how well it seals. Here's the difference between multi-point and single-point locking.
A single locking point — typically one latch — secures the sash at one place. It's simpler, but it pulls the sash tight at only that point, so sealing can be uneven along the rest of the sash.
Multiple locking points engage along the sash from one handle, pulling it tight against the gasket all round. This both improves security and creates an even, continuous seal against dust, noise, and rain.
The even compression of multi-point locking is a big part of why casement and tilt & turn windows seal so well. For security and sealing both, multi-point is the stronger choice on openable windows.
Multiple locking points that engage along the sash from one handle, pulling it tight against the gasket all round for better security and an even seal.
Yes — engaging at several points along the sash is harder to force than a single latch, and it also seals more evenly.
Casement and tilt & turn windows typically do, which is part of why they seal so tightly against noise and weather.
Related guides covering this topic from other angles — different products, applications, or contexts.
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