How to Recognise and Remedy Failed Double Glazing

If your home is fitted with double glazing, it is important that you can identify the different problems which can develop and understand the steps you need to take to remedy them. Below is a guide to some common issues that can affect double glazing.


If you notice draughts in your home, they may be caused by a broken seal around your double glazed windows. You should place your hand around the edge of the window and feel for the movement of air. 

If you can feel a draught between the window frame and the wall, it is likely that the sealant which surrounds the window has failed. This problem can be fixed by refilling the area between the frame and wall with fresh sealant. If you are confident, you can do this yourself. If you are not sure what you are doing, you should contact a window repair company.

If the draught is entering from the space between the frame and the glass, it is likely that the weather seal within the window has failed. You will need to contact a window company so they can replace the weather seal.


Condensation describes the process by which water vapour changes state and becomes a liquid. Condensation occurs because the temperature of the glass in the window is much lower than the surrounding environment. This causes water vapour in the air to condense into liquid water as it comes into contact with the glass and cools. 

If you notice that condensation is beginning to form on your windows, you should think about the ventilation in the room. Just breathing can add a lot of moisture to the air. The National Federation of Glaziers estimates that if two people sleep in an unventilated room for 8 hours, their breath will release 1.5 pints of water into the air. You should consider using an HVAC system to improve the ventilation within your home or invest in a dehumidifier, which will help to remove moisture from the air.


If you notice water pooling on your window sill, you should carefully inspect the seal around the window. If it appears broken or cracked and your windows are still under warranty, you should contact the manufacturer of the window to request replacement seals. If your window is no longer guaranteed, you should contact a professional window repair company.

If you have any concerns about the condition of your double glazed windows, contact a company, such as Nu-Look Glass & Aluminium Windows, today.