Answers to questions about window adjustment

Answers to questions about adjusting PVC windows

Window adjustment is a common maintenance task for PVC windows: sashes can sag, handles may become stiff, and drafts can appear. This guide explains how to inspect and perform basic adjustments, when simple maintenance is enough, and when to call a professional.

Why do windows need adjustment?

• Building settlement and seasonal temperature changes.
• Dust and wear of hardware.
• Incorrect installation or mechanical damage.

Tools and preparation

• Hex keys (2.5, 4 mm), Phillips and flat screwdrivers.
• Silicone-based lubricant, clean cloth, soft brush.
• Gloves and a small wedge to support the sash if needed.

Important: make sure the window is clean and there are no objects on the sill. Avoid mineral oils that can damage seals.

Main types of adjustments and step-by-step actions

1. Vertical adjustment (raising/lowering the sash)

1. Open the sash to a ventilating or service position to access the hinges.
2. Locate the adjustment screws on the lower or upper hinge (usually a 4 mm hex).
3. Turn the screw quarter turns and check the sash position. Clockwise usually raises, counterclockwise lowers.
4. Achieve even gaps around the frame.

2. Horizontal adjustment (lateral alignment)

• A screw on the hinge or keep plate moves the sash left or right.
• Adjust until the sash fits smoothly without rubbing.

3. Adjusting the compression (seal contact)

• On the sash edge there are cams or eccentric pins.
• Rotate them with a flat screwdriver to increase or decrease compression at specific points.

4. Tilt/turn and ventilation modes

• If the handle is difficult when entering tilt, check lubrication of guides and hinges.
• Clean mechanisms and apply silicone lubricant sparingly.

When to call a professional

• Large sash misalignment (>5 mm) that cannot be fixed by simple adjustment.
• Damaged seals, cracked profiles, or broken glass units.
• Lock or handle failures requiring part replacement.

Seasonal practice: summer/winter

• In summer, seals may soften — reduce compression slightly.
• In winter, increase compression for better heat retention.
• Inspect and service windows 1–2 times a year.

Maintenance tips

• Lubricate moving parts once a year.
• Wipe seals clean and avoid aggressive solvents.
• Use a smoke pencil or paper test to locate drafts precisely.

Frequently Asked Questions (FAQ)

How can I tell if a sash is misaligned?

If the sash rubs the frame in one spot or sticks when closing, with uneven gaps — it's likely misaligned.

Is it safe to adjust windows myself?

Basic adjustments (hinge screws, eccentric cams) are safe if done carefully. For major damage or large misalignment, call a professional.

How long does adjustment take?

A simple adjustment takes 15–30 minutes. Full inspection and tuning may take up to an hour.

My handle is loose after adjustment. What to do?

Check the handle mounting screws. If they keep loosening, the mechanism may need replacement.

Conclusion

Adjusting PVC windows is straightforward and prolongs service life while improving comfort. Regular inspection, seasonal compression changes, and annual lubrication prevent many problems. For significant defects, contact an experienced service technician.