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.
The retaining spline must suit the frame groove and mesh. Reusing a brittle or incorrectly sized spline can leave an uneven result. Keep any accessible product information and show the groove where visible, without damaging the frame to obtain a sample.
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.
Fit suitable mesh and spline to an accepted sound frame, or install a compatible ordinary supplied screen and check its fit. Scope limits: Ordinary insect mesh and compatible screen frames only. No security screens, fall-protection claims, specialist glazing or inaccessible high-level work.