What to do if a window drafts: step-by-step guide

How to tell if a window drafts

A draft near a window is not just an unpleasant discomfort — it’s a sign of serious insulation problems. It’s important to identify and fix the cause in time to avoid high heating costs, especially in Kyiv with its cold winters.

Signs that a window drafts:

• Feeling cold near the window even with closed walls
• Air movement — you can feel it with your hand or see it with a lit candle
• Condensation on the glass or reveals
• Freezing of walls around the window opening
• Increased heating costs without obvious reasons
• Mold in window corners or on reveals

Test: Run a lit candle or match along the window frame. If the flame wavers — this is a clear sign of a draft.

Main causes of drafts

Window drafts can have various causes, and correct diagnosis is key to an effective solution.

1. Worn or damaged seals:

• Seals lose elasticity over time
• Can be damaged during use
• Incorrect seal type selection

2. Improper hardware adjustment:

• Insufficient sash clamping against the frame
• Sash sagging due to load
• Wear of mechanical parts

3. Installation problems:

• Inaccurate window frame installation
• Missing or damaged mounting foam
• Violation of installation technology

4. Window opening problems:

• Cracks in the wall around the window
• Insufficient reveal insulation
• Thermal bridges due to structural features

5. Profile deformation:

• Temperature deformation
• Mechanical damage
• Low material quality

Step-by-step diagnosis guide

Step 1: Visual inspection

Carefully inspect the window from outside and inside. Pay attention to:

• Visible cracks or damage
• Seal condition (elasticity and integrity)
• Presence and condition of mounting foam
• Window frame levelness

Step 2: Draft test

Use one of these methods:

• Candle or match: Run along the frame and reveals
• Tissue: Run a thin tissue along the seams
• Hand: Run your hand along the frame, feeling for air movement

Step 3: Adjustment check

Check how the hardware works:

• Does the sash open and close easily
• Is there sufficient clamping when closed
• Are there any plays in the mechanisms

Step 4: Temperature measurement

Use a thermometer or thermal camera:

• Measure the temperature on the frame and adjacent wall
• Compare readings with the room temperature
• A difference of more than 5-7°C indicates a problem

Tip: Write down the diagnosis results — this will help the specialist identify the problem faster.

Solving the problem

After identifying the cause of the draft, choose the appropriate solution:

Solution 1: Seal replacement

• Remove the old seal
• Clean the groove of dirt and residue
• Install a new seal of the appropriate type
• Check the tightness

Solution 2: Hardware adjustment

• Adjust the clamping with a screwdriver or wrench
• Set the optimal mode for the season
• Check the operation of all mechanisms

Solution 3: Joint sealing

• Remove old mounting foam
• Fill gaps with new foam or sealant
• Smooth and paint the surface

Solution 4: Reveal insulation

• Install insulation on the reveals
• Plaster and paint
• Ensure tight joints

Solution 5: Contact a specialist

• If the problem can’t be solved independently
• For complex structural damage
• For comprehensive work

Important: Don’t attempt to solve complex problems on your own — incorrect actions can worsen the situation and lead to additional costs.

Prevention and maintenance

To avoid draft problems in the future, follow these simple rules:

Regular maintenance:

• Adjust hardware twice a year (before winter and summer)
• Lubricate mechanisms with specialized lubricant every 6 months
• Clean seals of dirt and dust

Seasonal preparation:

• In winter: Check tightness before the heating season
• In summer: Check seal and hardware condition
• In autumn: Perform additional sealing if needed

Professional maintenance:

• Call a professional for comprehensive diagnosis every 2-3 years
• Replace worn parts in a timely manner
• Follow manufacturer recommendations

Prevention: Regular window maintenance in Kyiv costs significantly less than repair or replacement. Invest in prevention to avoid major expenses.

Conclusion

Window drafts are a problem that can be solved with the right approach:

1. Diagnosis — identify the exact cause of the problem
2. Solution selection — choose the optimal elimination method
3. Work execution — follow the technology
4. Prevention — prevent the problem from recurring

UWS performs window repair and draft elimination in Kyiv — contact us for quick and quality diagnosis.