The Bowed Frame: Why One Overtightened Screw Can Ruin a New Window
A new uPVC window can bind, draught and lock badly despite having perfectly good hardware. One overtightened fixing without proper support behind the frame can bow the entire profile out of square.
The Handle Turns Too Far: Your Window Gearbox Has Lost Its Internal Stop
A uPVC window handle that suddenly travels beyond its normal stopping point can signal internal gearbox damage. Worn gears, a damaged follower or broken internal components can gradually disconnect the handle from the espagnolette locking strip.
The Window That Opens by Itself: Your Friction Stay Has Lost Its Grip
A uPVC window that slowly closes by itself or flies open in the wind may have lost friction inside its stay. A small adjustment can restore resistance on a serviceable hinge, while worn sliders, tracks and pivots point towards replacement.
The Glass That Looks Oily: Why Double Glazing Creates Rainbow Patches
Strange oily rainbow rings that refuse to wipe off may actually sit inside the double-glazed unit. Newton’s rings can form once the two panes bow close enough to touch, creating a distinctive optical interference pattern.
The Door That Locks Fine Open — Then Refuses to Lock Shut
A uPVC door that locks perfectly while open but refuses to lock once closed may not have a broken mechanism. One misaligned hook, roller or keep can physically stop the entire multipoint lock from travelling.
The Rust Streak Under Your Window: Your Fixing Screw is Corroding Inside the Frame
Brown streaks running down a white uPVC window are not rust coming from the plastic. A corroding steel fixing hidden inside the frame can release rusty water down the profile, particularly around exposed coastal properties.
The Screaming Window: Why Your Casement Whistles in Coastal Wind
A uPVC window can look completely shut and still scream during strong coastal winds. One tiny break in gasket compression lets air accelerate through the seal, creating a high-pitched whistle that can be tracked down with a simple paper test.
The Black Line Between the Panes: Why Warm-Edge Spacers Start Creeping
A black spacer bar creeping into the middle of a double-glazed unit looks like serious glass failure. Small movement can remain cosmetic, but severe distortion, internal misting and damaged edge seals point towards a failed sealed unit requiring replacement.
The Clicking Handle: Why Your Window Lock is Eating Its Own Keeps
A clicking or crunching uPVC window handle does not automatically mean the gearbox has failed. Misaligned mushroom cams can smash into the steel keeps every time the handle turns, slowly damaging the espag, keeps and gearbox.
Rattling Handles: The Easy Screw Fix Hidden Under the Plastic Cap
A wobbling window handle usually stems from backed-out fixing screws rather than a broken internal gearbox. Swiveling the hidden plastic cover cap reveals the mounting bolts for an instant trade fix.
