Chimney bricks are Porous, like a sponge. During times of heavy rain, chimneys take on a lot of water. And like a sponge, a brick can only hold so much water before it is incapable of holding any more. Once that point is hit, it will start leaking water into your home, causing interior damage. Below are some pictures of bricks no longer being able to shed water, and instead passing it through to the interior of the house.
Water damage also comes in the form of staining, loss of insulation value, deterioration, and ultimately, structural failure.
Brick water retention will also lead to moss growth on your chimney which can drastically damage mortar joints and crowns. (Click here to see our moss removal page)
Damage can especially occur during the freezing winter months when water in the bricks freezes and expands inside the brick, causing structural integrity damage to the brick. Few things are more damaging to a chimney's structural integrity than water.
To prevent water damage, a chimney needs to be properly protected with waterproofing specifically designed for bricks and mortar. Standard water sealer that you can buy at any hardware store do not work on chimney's as they are just sealers and silicone coatings, which form a water resistant surface film that traps water vapors. If these vapors cannot escape, they will add to the deterioration of your bricks. Painting your chimney also will not fix the problem as it again just seals the chimney and also does not allow the chimney to breathe, causing mortar damage and spalding as the water and water vapors still must leave the brick.
It is vitally important that your chimney is allowed to breathe. The product we use is a non film-forming water repellent that penetrates and lines masonry pores to prevent water from deteriorating the brick. It is 100% vapor permeable, meaning that water vapor trapped inside the brick can easily pass through, allowing the chimney to breathe.
This product also carries a 10 year warranty by the manufacturer.
Metro Chimney will come out and properly coat your chimney per the manufacturers recommended application instructions. Once done, we will give you a Warrantee card that you can fill out and send in to the Manufacturer for 10 years of worry free Chimney water protection.
* It is important to note that a chimney must be fully free of moss to apply this product per manufacturers instructions (Click here to see our moss removal page). It also can not be applied until 5 days after moss removal.
** We must wait for a full 28 days following a chimney repair to apply this product per the manufacturers instructions. This is to allow the new mortar work to cure enough to allow the water proofing to have full penetration.
*** It is best to do this service in the dryer spring and summer months, but we can do this on any day of the year so long as it is not raining.
Metro Chimney is licensed and bonded. Insured through Berkeley Assurance Insurance and bonded through Merchant Insurance.
Oregon Construction Contractor Board License Number 184595.