How to Adjust uPVC Windows to Stop Draughts?

Draught-free windows are essential for maintaining a comfortable and energy-efficient home. Cold air seeping through gaps in uPVC windows can lead to higher energy bills, discomfort, and even condensation problems.

This guide will walk you through the process of adjusting uPVC windows to eliminate draughts, ensuring better insulation and reducing heating costs. Whether you're a homeowner or renter, these practical steps will help you improve your window’s efficiency and overall performance.

Why Draughts Happen in uPVC Windows

Draughts in uPVC windows typically occur due to a range of common issues, including:

Misalignment of the Window Frame

Over time, window frames can shift slightly due to temperature changes, wear and tear, or incorrect installation. This can create small gaps where cold air enters.

Damaged Seals or Weatherstripping

The rubber seals or weatherstripping around the window can deteriorate due to age, exposure to sunlight, or repeated opening and closing. When these seals become brittle or cracked, they allow air leaks.

Faulty Hinges or Locking Mechanism

If the hinges are loose or misaligned, the window may not close tightly against the frame. Similarly, a poorly adjusted locking mechanism can prevent the window from forming a proper seal.

Poor Installation

Improper installation of uPVC windows can result in gaps between the window frame and the wall, leading to persistent draughts.

The Impact of Draughts on Your Home

Energy Efficiency Loss

Draughts allow warm air to escape and cold air to enter, forcing your heating system to work harder and increasing your energy bills, particularly in winter.

Comfort Issues

Cold spots and fluctuating indoor temperatures can make your home feel uncomfortable, especially in living areas and bedrooms.

Condensation and Mould

Cold air entering through draughty windows can lead to condensation forming on the glass. This moisture can encourage mould growth, which may pose health risks and damage the window frame.

Tools You’ll Need to Adjust Your uPVC Windows

Basic Tools

• Screwdriver (Phillips and flat-head) – For hinge and lock adjustments.

• Allen key – Often required for fine-tuning window hinges.

• Spirit level – To check for frame misalignment.

• Tape measure – To measure gaps and ensure proper adjustments.

• Pliers – For gripping and adjusting small components.

Optional Tools for Specific Adjustments

• Lubrication spray (silicone-based or WD-40) – To improve the movement of hinges and locking mechanisms.

• Replacement weatherstripping or rubber seals – If existing ones are damaged.

• Sealant or caulk – To seal gaps between the window frame and wall.

How to Identify the Source of Draughts in Your uPVC Windows

Checking for Gaps

A simple way to detect draughts is by holding a lit candle or an incense stick near the window edges. If the flame flickers or smoke moves erratically, there is an air leak.

Inspecting the Window Seal

Examine the rubber seals around the window for cracks, gaps, or areas where they have become loose.

Frame Alignment Check

Look for visible gaps between the window sash and the frame when the window is closed. If daylight is visible through any part of the seal, adjustments are needed.

Step-by-Step Guide to Adjusting uPVC Windows to Stop Draughts

Step 1: Ensure the Window is Properly Closed

Closing Mechanism Check

• Ensure the locking system engages fully when the window is shut.

• If the window doesn’t close tightly, adjust the lock position to ensure a snug fit.

Adjusting the Window Sash

• Use an Allen key to slightly adjust the sash up, down, left, or right to improve the fit against the frame.

Step 2: Adjusting the Hinges

How to Adjust the Hinges

• If the window is not sitting flush against the frame, use an Allen key to adjust the hinge screws.

• Tighten or loosen the hinge bolts to shift the sash horizontally or vertically for a better seal.

Fixing Sagging Windows

• If the window has dropped over time, slightly tighten the top hinge and loosen the bottom hinge to lift it back into place.

Step 3: Replacing or Repairing Damaged Weatherstripping

Inspecting Weatherstripping

• Check for visible cracks, peeling, or hardened rubber seals that no longer provide a proper seal.

Replacing Weatherstripping

• Remove the old weatherstripping carefully.

• Clean the area before applying new rubber seals or foam strips.

• Press the new weatherstripping firmly into place, ensuring there are no gaps.

Sealing the Window Gaps

• Use a flexible sealant or foam tape to fill any small gaps around the frame where air might be entering.

Step 4: Adjusting the Locking Mechanism and Frame Alignment

Aligning the Locking Mechanism

• If the window does not lock securely, use an Allen key to adjust the lock position so that it presses the sash tightly against the frame.

Realigning the Frame

• If there are persistent gaps, use a spirit level to check if the frame is properly aligned.

• Slightly loosen the frame screws, adjust the position, and re-tighten them.

Step 5: Lubricating the Moving Parts

Lubricating the Hinges and Mechanisms

• Apply a small amount of silicone-based lubricant to the hinges, locks, and handles to ensure smooth operation and a tighter seal when closed.

Additional Tips for Preventing Draughts Around uPVC Windows

Check for Gaps Around the Window Frame

• Use expanding foam insulation to fill any visible gaps between the window frame and the surrounding wall.

Double-Check the Caulking

• Inspect the exterior caulking around the window. If it has deteriorated, remove and reapply a fresh bead of weatherproof sealant.

Proper Ventilation

• While sealing out draughts is important, it’s also essential to allow adequate airflow to prevent condensation buildup. Consider using trickle vents where necessary.

Common Mistakes to Avoid When Adjusting uPVC Windows

Over-tightening Hinges or Locks

Excessively tightening hinges or locks can cause damage and make the window difficult to operate.

Using the Wrong Type of Weatherstripping

Selecting inappropriate weatherstripping materials can affect how well the window closes and seals. Ensure you choose high-quality rubber seals.

Not Checking for Larger Installation Issues

If draughts persist despite adjustments, the window may have been poorly installed, requiring professional assessment.

When to Seek Professional Help

Signs You Need Expert Assistance

• Severe frame misalignment.

• A locking mechanism that fails despite adjustments.

• Visible damage to the frame or hinges.

What a Professional Can Do

• Carry out precise frame realignment.

• Replace faulty components such as hinges, locks, or seals.

• Conduct full window resealing to prevent draughts permanently.

Adjusting your uPVC windows to stop draughts is a cost-effective way to improve energy efficiency and home comfort. By following the steps outlined in this guide, you can effectively eliminate cold air leaks and enhance insulation.

If adjustments do not resolve the issue, seeking professional assistance can ensure your windows are properly sealed and functioning optimally. Take action today to enjoy a warmer, draught-free home!