Chimney Brick Sealer, Clear Water-Based Siloxane Sealer - Breathable Waterproofer for All Exterior, Vertical Masonry Surfaces - 1 Gal

Our house is mid century modern stone home with the chimney going perpendicular into the house about 20 feet. There are 5 flues. After buying the home about 13 years ago, there were slight leaks around the fireplace ceiling after a good rain. It gradually got worse over time that developed into water running down into the living room across the ceiling. I mean alot of water. When entering the front door, there is about 6 feet of chimney outside the entrance (under roof). I started wondering why this stone would be soaked with water after rain. Did my research and learned that stone can act like a sponge. I used this product about 6 years ago and have not had a drop of water since. Stone at entrance is dry as a bone even after heavy rains. Still working great but reapplying. Just to be safe.

My masonry chimney has extremely porous mortar joints and during heavy prolonged rain (several days), does tend to leak into our den and you can see the water slowing running down the interior chimney brick during these storms. Before I determined the cause of the leak, all chimney flashing was replaced along with the crown and I have used other moisture barriers in the past but their effectiveness was short lived and the water repellent feature was questionable.This product seems very promising. Although we haven't had prolonged rain since its application, i did spray some of an area of my masonry patio stone and after wetting it down the water beading was obvious. Only time will tell on how long it lasts on the chimney but the description says it can last up to 5 years and I'll keep an eye on it but will most likely reapply in about 3 years just to be safe.

I used this to seal my chimney last fall. It went on easily enough but I won’t know for another year or two now well it holds up.

Easy to apply to chimney brick, good water repellency. I would buy this again.

Covered well. very easily

Our chimney was leaking everytime it rained. We had bowls sitting all over the bottom of the chimney and everytime it rained we would have to keep up with all the bowls to make sure they didn't overflow. After using Chimney Brick Sealer, we no longer have any bowls in the chimney. It has worked great. I highly recommend it for leakly chimneys.

My chimney was constructed almost 50 years ago by a contractor friend and myself. It started leaking about a couple of years ago and just kept getting worse. After discovering this product, my 24 year old grandson agreed to apply. He pressured washed chimney and allowed 2 days to dry out, then came back and sprayed the product to all four sides of chimney and followed the INSTRUCTIONS TO THE LETTER. It only took 1 gallon to do entire job and this was for 2 coats. Just can't say enough about the product! Not a drop of water anywhere inside! Total time, including the pressure washing and application of product was about 1½ hours. Price is very attractive and the results are absolutely amazing. Will be doing this again in a couple of years just to be safe. Go for it!

Hasn’t rained since applying so I can’t speak to that. I can say a sprayer would be the best way to apply this product, this stuff is like water. Mask off and cover everything you don’t want this on.