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A Quick Guide to Adjusting Double Glazed Windows

Kadi Siilik
Written by Kadi Siilik09.02.2023

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There are a number of reasons why you might be looking for a solution for adjusting double glazed windows. Perhaps you have recently purchased your own windows and want to know how to perfect your installation. Or, you might have been noticing some problems such as draughts, excess condensation or that your windows are not opening and closing properly. 

In general, double glazed windows are very durable, don’t need much adjustment and have a long life span – in fact, Klar offers a 10-year product warranty. However, it is not uncommon that they shift slightly from wear and tear and temperature changes. 

Want to know more about assessing whether there’s a problem? Check out our article on “How to Test Double Glazing.”

A simple solution

Luckily, adjusting double glazed windows is a fairly quick fix that you can do without having to call in a professional. By having a higher energy rating, double glazed windows save money, and properly adjusting your windows will ensure these benefits. 

We’ll walk you through the two main methods: aligning the window frame height and correcting the lock position. If you have any questions along the way, Klar’s friendly customer service representatives are eager to help – and just a phone call or email away.

Aligning the Window Frame Height

When you are adjusting double glazed windows, the first method is to make sure that they are fitted at the correct height. There are a few key things to check to make sure that the sashes fit nicely in their frames. Since adjusting double-glazed windows takes about ten to twenty minutes, we recommend that you do it when the weather is clear. To find out about the complete installation process, check our installation guide.

It's a cinch - in 5 steps

The following guidelines are for a typical casement window, but the procedure is similar for most window types.

Check that the bottom sash fits comfortably in the frame. If it rubs or sticks, the window height needs to be raised and if there is a gap it needs to be lowered.

Open the window all the way so that you can easily access the small screws on the casements (the long metal strips on the side of the frame).

Loosen the small screws that attach the casement to the right side of the window frame. Make sure you don't loosen the screws on the hinges. In the same way, loosen the small screws on the left side of the casement.

Lift or press the window sash up or down to adjust to the height you need. Once you’ve got the correct height, take care to hold the window in place.

Tighten all screws and open and close the window to make sure that it is aligned and shuts smoothly.

Correcting the Lock Position for a Proper Seal

Once you have checked that the window height is where it should be so that it opens and closes smoothly without sticking or having a gap, you are halfway done. For the second method in adjusting double glazed windows, inspect that the lock position has a tight seal. 

Klar’s durable double glazed windows save heat and energy, and provide for a cosy indoor atmosphere. If your otherwise warm and snuggly evenings are being disturbed by the occasional burst of chilly air and you suspect your windows have been letting in draughts, chances are you need to tighten the lock seal. On the other hand, if it seems like locking the window requires too much muscle or that it won’t lock completely, you probably need to loosen the lock position a bit. 

Once you have gone through these two methods, your solution to adjusting double glazed windows will be done and dusted.

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Easy as 1-2-3

1Open the window
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Open the window fully and locate the lock-adjustment head, on the side of the window sash.
2Move the lock
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Use an Allen wrench to move the placement of the lock.
3Adjust
Turn the wrench clockwise to move the lock backwards, or counterclockwise to move it forwards, depending on whether you need to tighten or loosen the lock seal.

FAQ

Will adjusting double glazed windows stop draughts?

Yes, in most cases. If your double glazed windows are not airtight, it is advisable to first check that the seals are intact and properly fitted. If the seals have considerable wear and tear, then you may need to replace them. Otherwise, adjust the window so that it closes properly to ensure against draughts.

Do I need to adjust my windows if they are fogging up on the outside?

No, you don’t. If they are fogging up on the outside, it is a sign that they are providing effective insulation and does not indicate a need for adjusting double glazed windows. This fogginess typically happens when there is a considerable temperature shift, like in wintertime when it is much colder at night than it is when the sun is shining. 

Is adjusting double glazed windows necessary if there is condensation between the two panes of glass? 

If there is moisture between the double glazing, it means that the seal is no longer intact. You will either need to repair the seal, or replace the entire unit. 

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