Windows & Glazing

10 Reasons Double Glazing Units Fail

Published 5 Jun 2026

What this video covers

From seal breakdown to poor installation, discover the top causes of double glazing failure and what they cost to fix..

Double glazing can fail for many reasons, from seal breakdown to poor installation. Here are the ten most common causes, ranked by frequency and cost. From Axiom Eco Homes.

In this video

  1. 0:00 Intro
  2. 0:12 10. Manufacturing Defects
  3. 0:20 9. Inadequate Ventilation
  4. 0:31 8. UV and Solar Degradation
  5. 0:40 7. Physical Impact Damage
  6. 0:48 6. Age-Related Wear
  7. 0:57 5. Moisture Ingress from Outside
  8. 1:07 4. Frame Material Failure
  9. 1:16 3. Poor Installation
  10. 1:26 2. Thermal Stress Cracking
  11. 1:34 1. Seal Breakdown
  12. 1:46 Where to start