When should you replace window/door seals?

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)

• RK Weatherproof EPDM
• RK Universal Seal EPDM
• RK Garage Seal (EPDM-based solid rubber)  

• RK Weatherproof P-profile

• RK Groove Seals
• RK Weatherproof TPE 

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)