How to Fix a Letterbox Draught

Overview

A draughty letterbox lets cold air in. This guide covers fixing a letterbox draught.

Step-by-Step Fix

1. Carefully inspect your letterbox flap to ensure it closes completely flush against the door or frame when not in use. Look for any visible gaps around the edges or if the flap remains slightly ajar, as this indicates a potential draught source. Before proceeding, push the flap firmly several times to confirm it springs back and seals tightly.
2. Consider fitting an internal letterbox draught excluder, often found at DIY stores, which attaches to the inside of your door over the letterbox opening. Measure the dimensions of your existing letterbox aperture carefully to select a suitable size draught excluder. Once installed, check that the brushes or flaps within the excluder effectively block airflow without hindering mail delivery.
3. Open your letterbox flap and thoroughly clean any dirt, dust, or debris that might be obstructing its smooth movement or preventing it from closing fully. Use a damp cloth or a small brush to clear any obstructions from the hinges and the surrounding frame. After cleaning, operate the flap several times to ensure it moves freely and settles back into its fully closed position without resistance.
4. Examine the external flap of your letterbox for any signs of damage, such as cracks, bends, or missing sections that could allow air to pass through. If the outer flap is compromised, this will let cold air directly into the letterbox cavity and then into your home. A damaged outer flap will likely need to be replaced, as repairs are often ineffective.
5. Once you have completed any adjustments or installations, stand by your letterbox on a breezy day or create a draught from inside using an incense stick or a light piece of tissue. Observe if the smoke or tissue moves, indicating that cold air is still entering your home. If you still detect a draught, re-evaluate the previous steps to identify any missed gaps or faulty components.

Common Symptoms & Diagnostic Resolutions

Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.

Frequently Asked Questions