Scratches and small cracks

Small holes

Large holes


Good to know about weatherproofing

When to replace seals?

Why to replace seals?

Choosing the correct seal

Checklist for weatherproofing

The most common mistakes in weatherproofing

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When should you replace window/door seals?

A window seal removal


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)

PU-seal – lasts for 0,5 - 2 years
EPDM-seal – lasts for 4 - 8 years 
Silicone seal –  lasts for approx. 15 - 20 years
TPE-seal –  lasts for 12-15 years (environmentally friendly)

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)