A Chimney Cap Keeps Out the Rain Though not the only reason to install a chimney cap, most uncapped chimneys more than five years old usually have some type of water damage. You can this yourself by using a screwdriver to lightly scrape the mortar between the bricks at the rear of your fireplace. If this results in some crumbling of the mortar, you just might have some water damage.Ran can also contribute to bad odors in your chimney, and can also damage your damper. |