Frequently asked questions about window adjustment

Introduction

Adjusting PVC windows is a common maintenance task after installation. Proper adjustment eliminates drafts, reduces noise, restores correct sash sealing and extends the life of the hardware. This guide explains how to detect the need for adjustment, what types of adjustments exist, which tools are needed, what you can do yourself, and when to call a professional.

Why windows need adjustment

• Building settlement and seasonal temperature changes.
• Wear of hardware and seals.
• Incorrect operation — jamming or slamming the sash.
• Dirt and moisture in the mechanisms.

Adjustment restores a tight seal and correct sash movement without removing the glazing unit.

Types of adjustment

• Vertical adjustment — raises or lowers the sash along the hinges.
• Horizontal (lateral) adjustment — shifts the sash left/right to eliminate gaps.
• Compression adjustment — changes the pressure of the seal around the sash.
• Ventilation mode adjustments and striker plate alignment.

Tools and materials

• Hex keys (usually 4 mm and 6 mm).
• Screwdrivers (Phillips and flathead).
• Silicone lubricant or special hardware spray.
• Replacement seals, if needed.
• Flashlight and a thin feeler gauge or ruler to check gaps.

How to tell an adjustment is needed: quick tests

• Paper test: if a sheet slips out easily all around, there is a misalignment.
• Feel for cold air at the seams.
• The sash rubs the frame or creaks during opening/closing — hinge adjustment needed.
• Uneven gap along the top or bottom edge of the sash.

Step-by-step basic self-adjustment

1. Locate the adjustment screws — on hinges and hardware heads.
2. Vertical: turn the screw on the bottom hinge clockwise/counterclockwise to raise/lower the sash.
3. Horizontal: loosen the clamping screw and rotate the lateral screw to shift the sash inwards/outwards.
4. Compression: use the adjustment screw near the handle or striker to increase/decrease seal pressure.
5. Lubrication: apply a small amount of silicone lubricant to moving parts — avoid oily lubricants on seals.
6. Test: open/close the sash and repeat the paper test.

Note: Do not overtighten screws — this can deform hardware. Work gradually and test frequently.

When not to attempt DIY

• If the glass unit is cracked or the profile is damaged.
• When hardware replacement or dismantling is required.
• If the sash is severely sagging — hinge replacement may be needed.
• Under manufacturer warranty conditions — use authorized service.

Common mistakes

• Over-tightening screws and damaging threads.
• Using wrong tools.
• Applying oil to seals — causes swelling and loss of elasticity.
• Ignoring seasonal adjustment: summer may require loosening, winter — tightening.

FAQ — Frequently Asked Questions

1. How often should windows be adjusted?

An inspection and basic preventive adjustment is recommended once a year, before winter. For intensive use, check every six months.

2. How much does professional adjustment cost?

Price depends on the number of sashes and complexity. Typical Latvian market rates vary; check local service providers and warranty terms.

3. Can I replace the seal myself?

Yes, replacing the seal is common. Make sure to choose the correct profile (EPDM etc.), remove the old seal carefully and install the new one evenly to ensure proper compression.

4. What to do if the handle is stuck?

Avoid force. Check the position of locking elements and try lubrication. If the handle remains stuck after lubrication, call a technician.

5. How does season affect compression?

Seals expand slightly in summer and contract in winter. Many modern windows have adjustable compression settings to compensate for seasonal changes.

6. Will adjustment fix condensation?

Condensation is more often related to indoor humidity and ventilation. Adjustment can remove drafts, but persistent condensation requires a ventilation check.

7. How long does an adjustment take?

A simple adjustment of one sash typically takes 10–30 minutes. Complex cases with hardware replacement take longer.

8. Is there a warranty after adjustment?

If adjusted by an authorized service or under installation warranty — yes. DIY adjustments may void parts of the warranty; verify with your installer.

If you need help or want to schedule a technician visit, contact our support. Timely and correct adjustments preserve window performance and home comfort.