Removing condensation from failed double glazed units is a simple process that can be completed in around 20 minutes per window. The Condensation2Clear kit provides everything you need.
The 4 Stage Repair Process
Stage 1: Install Template
Attach the drill template to two diagonally opposite corners of the failed window. The template ensures the holes are drilled in the correct position — in the bottom corner and top corner of the sealed unit.
Stage 2: Drill 2 Holes
Using the diamond coated glass drill bits supplied in the kit, drill two small 4mm holes through the inner pane of glass. One hole at the bottom and one at the top. The diamond drill bits make this quick and easy — no special skills required. Simply use a standard household drill at low speed with water as a lubricant.
Stage 3: Insert Drying Agent
Pour the drying agent pellets through the bottom hole. The drying agent absorbs the moisture trapped inside the unit. Repeat every other day for approximately 5 days until the window is clear.
Stage 4: Insert Vents
Once the window has fully cleared, install the small one-way vents into both holes. These vents allow the unit to breathe while preventing moisture from entering, converting your sealed unit into a pressure-equalised unit.
How Long Does It Take to Clear?
Most windows clear within 7-14 days, depending on the amount of condensation. Heavily fogged units may take a little longer. The drying agent continues to work after installation.
Will the Condensation Return?
No. Once repaired, the unit becomes pressure-equalised rather than sealed. This means it no longer suffers from solar pumping — the very process that caused the seal to fail in the first place. The repair is guaranteed for 20 years.
What About Thermal Performance?
A sealed unit that has failed has already lost its thermal advantage — the argon gas has escaped and been replaced by damp air. After repair, the unit contains dry air which provides excellent thermal performance. The difference in thermal efficiency between dry air and argon gas is only 1-2%, yet replacing a sealed unit can cost hundreds of pounds.