You waterproof your deck to make it last longer and help to sustain its beauty but, have you ever thought about doing the same for your chimney? Masonry products are very porous which allows water to absorb into your chimney. Think of it as a sponge, soaking up water and releasing it throughout your chimney’s interior. Defective mortar joints or the use of improper mortar can also greatly increase the tendency to absorb and convey water to the interior of the chimney.
Fortunately, there have been products developed to use specifically to repel water from your masonry. These formulas are 100% vapor permeable, which means your chimney can still breathe like it should. These products usually carry a 5 to 10 year warranty. It is highly recommended that you never use paint or clear sealers to waterproof your chimney because this will only trap the water vapors inside and this can cause your chimney to further deteriorate.
If your chimney already has gaps, voids, cracks, missing mortar etc., it is recommended you first have them repaired before waterproofing your chimney. If your chimney is intact and you want to protect it for years to come it is recommended that you first clean your chimney from any debris that may be settling onto your chimney’s surface before applying the sealer.
Its small steps like these that can prevent costly chimney repairs later.