Condensation on your aluminium door threshold can lead to damp, mould, and even structural damage if left unchecked.
In the UK’s cold and humid climate, this is a common issue—but the good news is, it’s preventable.
In this guide, we’ll explain:
✔ Why condensation forms on door thresholds
✔ Quick fixes to stop moisture buildup
✔ Long-term solutions for a dry, draught-free entrance
Why Does Condensation Form on Aluminium Door Thresholds?
Condensation occurs when warm, moist air hits a cold surface (like your metal threshold) and turns into water droplets. In the UK, this often happens because:
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High indoor humidity (from cooking, showers, drying clothes)
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Poor ventilation (trapped moisture has nowhere to escape)
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Temperature differences (cold outside vs. warm inside)
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Faulty or missing weather seals (letting damp air seep in)
If ignored, this moisture can cause mould growth, slippery surfaces, and even rust on surrounding fittings.
How to Stop Condensation – 6 Effective Solutions
1. Improve Ventilation
✅ Open windows regularly (especially after showering or cooking).
✅ Use extractor fans to remove humid air.
✅ Install trickle vents in windows or doors for constant airflow.
Quick Fix: Place a dehumidifier near the door to absorb excess moisture.
2. Check & Upgrade Door Seals
A worn-out or poorly fitted door threshold strip lets in cold air, making condensation worse.
✅ Replace old seals with a new aluminium door threshold strip for a tight fit.
✅ Use draught excluders at the bottom of the door.
3. Insulate the Threshold
Aluminium conducts cold, so adding insulation helps:
✅ Apply foam or rubber tape under the threshold to reduce heat transfer.
✅ Use a thermal break threshold (designed to minimise cold bridging).
4. Install a Heated Threshold (Advanced Fix)
For persistent condensation (common in modern airtight homes), a low-voltage heated threshold can keep the area warm and dry.
5. Adjust Heating & Humidity Levels
✅ Keep indoor temps steady (around 18-21°C) to prevent sudden temperature drops.
✅ Avoid drying clothes indoors (a major source of excess moisture).
6. Choose an Anti-Condensation Threshold
Some aluminium door thresholds come with:
✔ Thermal breaks (reducing cold spots)
✔ Drip channels (to divert water away)
✔ Sloped design (preventing pooling)
Case Study: Fixing Condensation in a Bristol Home
Problem: A homeowner noticed constant condensation on their external aluminium door threshold, leading to mould on the frame.
Solution: They:
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Replaced the old threshold with a thermal break aluminium threshold.
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Added a new silicone seal.
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Installed a dehumidifier in the hallway.
Result: No more condensation, and the door stayed dry even in winter.
FAQs
Q: Will a plastic threshold prevent condensation better than aluminium?
A: Plastic is less conductive, so it may reduce condensation—but high-quality aluminium thresholds with thermal breaks work just as well while being more durable.
Q: Can I use WD-40 to stop condensation?
A: No! WD-40 is a lubricant, not a long-term fix. Proper insulation and ventilation are key.
Q: Does double glazing help with threshold condensation?
A: Yes—it reduces indoor humidity by keeping rooms warmer, but you still need good door seals.
Final Tips to Keep Your Threshold Dry
✔ Wipe away condensation daily to prevent mould.
✔ Check seals every 6 months for wear and tear.
✔ Consider a professional fitting if DIY fixes don’t work.
Need a New Aluminium Door Threshold?
Browse our UK-tested thresholds with anti-condensation designs:
✅ Thermal break options
✅ Easy-fit strips & seals
✅ 10-year rust-proof guarantee
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