You should check the weatherstrips' condition annually when you wash the windows or at minimum once every five years. The seals should usually be changed between 5-40 times during the windows'/doors' lifetime, depending on the quality and material of the seals. When you replace the weatherstrips, you should check the strips' durability - there are differences between materials and quality.
The durability of materials (RK Seals)
- RK Dust Seal (foam seal)
Hints on when to replace seals
- Dust and soot in seals (leak or too narrow seal)
- Water and snow between windows (leak or too narrow seal)
- Ice or vapour inside the outer window (inner seal too thin or old)
- Vapour in inner glass (no seal in outer window, high air moisture percentage, curtain or lots of flowers in front of window, weak deaeration or no replacement air ventilator)