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Condensation on the glass V's In between the glass

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Double glazing units are like the dynamic duo of windows, consisting of two panes of glass that join forces (or three panes in the case of triple glazing) to bring you comfort and energy efficiency! These panes are spaced apart with a trusty spacer bar and sealed tightly with both primary and secondary sealant, forming a single, airtight unit. Think of it as a cozy, insulated sandwich for your window—complete with an air or gas-filled cavity in between to keep things snug and warm.

Now, what fills the cavity, you ask? This isn’t just any old air; it’s filled under vacuum conditions with either dehydrated air or an inert gas, like argon, to supercharge insulation and give condensation the cold shoulder. It’s like giving your window a comfy blanket that keeps the chill out and the warmth in!

But that’s not all. One of the surfaces of the glass has a transparent coating that acts like your window’s superhero cape, reflecting heat back into your home. This clever little feature significantly reduces heat loss, making your home cozier without running up those energy bills. Imagine sitting next to a window on a chilly evening, enjoying the warm glow of your living room, while outside, the elements shiver in defeat.

So, what’s the difference?

Using the image to the right as a reference, note the labelled face of the glass which relates to the condensation on your window and then see the reasons and options stated below.

Condensation on face 1
- if the face temperature is significantly lower than the external air temperature, condensation will occur.

Condensation on faces 2 and 3 -
inside the double-glazed unit - indicates that the cavity is no longer sealed. The window cavity’s desiccant is rapidly saturated, so damp air entering via the damaged seal around the edge results in moisture and condensation between the glass. This can be rectified by replacing the glass unit and keeping the existing frame.



Condensation on face 4 –
influenced by external climate; internal air temperature; humidity within the building; and ventilation flow rate. Particularly common in bathrooms, kitchens or rooms with high humidity levels. Ventilation is key here, replacing the glass in most circumstances will not resolve the issue.

Still need your condensation and glass units? Book a FREE survey on our website or call the team to discuss!

We look forward to helping you soon, and remember - Why Replace... We Repair...