When patching a door gasket, how much material should be replaced around the damaged area?

When patching a door gasket, it's important to ensure that the repair is effective and provides a proper seal upon completion. Replacing the material around the damaged area by 50mm from each side is considered best practice as it allows for adequate coverage. This distance ensures that new material can bond effectively with the old gasket, preventing any leaks or gaps that could compromise the integrity of the seal.

Choosing a smaller distance, such as 25mm, may not provide enough material for a secure patch, potentially leading to future issues. On the other hand, opting for larger distances, such as 75mm or 100mm, could be unnecessarily excessive and wasteful, while also complicating the repair process without adding significant value in terms of sealing efficacy. Therefore, replacing the gasket material by 50mm from each side strikes the right balance between ensuring a reliable seal and maintaining efficiency in the repair work.