This post was most recently updated on January 19th, 2021
Update for 2021: How to Seal a Chimney
In this updated article, we explain How to Seal a Chimney. If you have encountered any issues and have any suggestions or have any questions, please comment below.
One of the most problematic areas of a home is the chimney. Water and moisture can cause scaling, deterioration, spalling, water intrusion in the home, and freeze/thaw damage. Waterproofing and sealing a chimney can be vital to its structural integrity.
Before sealing a brick chimney, clean the surface with a brick cleaner to remove all curing compounds or visible stains such as mold, mildew, efflorescence, or rust. The chimney should be clean and free of dirt, oil, dust, and any unwanted contaminants. For severe mold, mildew, fungus, or algae use a bleach solution.
When dealing with a chimney, it is important to practice safety and never get on a ladder or roof without the proper knowledge and experience. Wear chemical-resistant gloves and safety glasses when handling cleaning solutions.