• 210 S State St Lake Oswego, OR 97034
  • (503) 954-0726
  • clayton@metrochimneypdx.com


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 chimney 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, it will deteriorate your bricks. Painting your chimney also will not fix the problem as it again just seals the chimney and 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 the bricks in your chimney breathe. Store bought waterproofing from the local Hardware Stores or Chain Hardware Stores also seal a chimney as the paint above and will create the same problems as painting a chimney. 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.



If there is moss present on the chimney, we will have to perform chimney moss removal first before waterproofing application in accordance with the Manufacturer’s qualifications before application. If there is any lime leaching, or lime from a previous chimney repair, we will also have to do an acid wash on the chimney to remove the lime in accordance with the Manufacturer’s qualifications before application as well. If we do not do these two procedures, if necessary, the Manufacturer will not cover the warranty.

This product also carries a 10 year Manufacturer’s Warranty.


Metro Chimney will come out and properly coat your chimney per the Manufacturer’s recommended application instructions. Once done, we will give you a Warranty 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 24 hours after moss removal to allow the PH in the chimney to return to normal. It also must be applied on a dry day that is above 40 degrees.

**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.





I e-mail bids only to give you all the information you need to make an informed decision for the work. If you contact me for a bid, please give me a correct e-mail address. Also, I may need to contact you via phone prior to e-mailing you the bid if there is work that needs to be done in addition to what you originally called for due to structural, code, or safety reasons, or if I need any further information not provided during your first call to schedule me to come out to do the bid.






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