It may seem that a home’s chimney was made to withstand anything that comes its way, especially something as simple as water. And yet, water damage is the number one reason chimneys require repair. With time, water can damage the inside of a chimney (especially as water freezes and expands in the winter).
This increases the chance that a chimney fire could spread to the outside of your home. It also increases the presence of creosote in your chimney, a highly flammable substance, which is what makes waterproofing so important.