a handle, latch, hinge, track or screen is visibly worn or damaged. Fit suitable mesh and spline to an accepted sound frame, or install a compatible ordinary supplied screen and check its fit.
Signs: the window is stiff, loose or no longer moves through its normal range or the window does not close, catch or sit evenly as it did before. Causes: normal wear in accessible moving hardware or movement, dirt or damage around the relevant hardware.
Mesh needs suitable tension without distorting the frame. Corners and long sides should be checked during fitting, following the material requirements. Over-tightening is not a way to strengthen an old frame, and loose mesh may reflect a retaining-channel problem.
Different mesh products have different handling and fixing requirements. Share the proposed product and the screen dimensions before ordering. This is ordinary insect-screen work; stronger-sounding product labels do not turn an ordinary frame into a certified security or protective screen.
Handle the screen by its frame and follow mesh care instructions. An insect screen is not a security barrier or fall-prevention device. Limits: Ordinary insect mesh and compatible screen frames only. No security screens, fall-protection claims, specialist glazing or inaccessible high-level work.