How to Adjust Top-Hung uPVC Windows

Adjust UPVC window

Do you notice draughts around the sides and bottom of your top-hung uPVC windows? Then you may need to adjust the screws in the inside of your uPVC frame. But how can you adjust a window if it opens up and outwards from the window frames?

In this article, we’re going to discuss how to adjust top-hung uPVC windows. This is critically important since unaligned top-hung uPVC windows can cause draughts and affects your home’s ventilation. But lift your spirits, because it doesn’t require much time and you can do it yourself. Let’s get started. 

Adjusting your Top-Hung uPVC Window’s Height

1. Check the bottom of the window sash and see if it fits in the frame.

Open and close your window several times to inspect the bottom of the sash if it fits and slides smoothly into the window frame. If it sticks against the frame or seal, then you need to raise the height. But if when if it rest about 1⁄16 inch (0.16 cm) above the frame when you close it, then you have to lower down the window’s height to prevent draughts. 

  • The window sash is the panel that raises and lowers when you open up the window. It is typically composed of multiple glass panes. 

2. Open the window completely.

It will help you gain more access to the small screws that need to be loosened to alter the height of the window. Window adjustment may take up to 15-20 minutes, so, it would be better to do it on a rain-free day. 

3. Loosen the screws on the left and right side of the frame that holds the window casement.

There are four small screws on the left and right side of the casement that holds the metal strip to the window frame. Loosen each of them with a full turn in a counterclockwise direction using a Phillips head screwdriver. The screws vary in size, so test out different sizes until you find the screwdriver that perfectly fits into the screw. 

4. Adjust the window’s height by pressing or lifting the window sash. 

Once the screws have been loosened, you can already raise or lower down the height of your moveable window panel. If your top-hung window is not closing fully, move it a little increment downward. But if it sticks against the frame when you’re closing it, push it upward. 

If the panel is heavy, it may get pulled downward with its own weight so you may need to give support to the window panel until the screws get tightened again. 

5. Tighten all the screws.

After adjusting the window, put back the screws(a total of 8) in place and tighten it by doing a full turn in a clockwise direction. Then, close the windows a few times to see if it opens and closes smoothly.  

Your uPVC window should fit snugly into the frame by now. By doing those simple steps, you can stop draughts caused by unaligned windows in your home. 

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