Used DryLok To Stop Brick Spalling And Sealed a Chimney Cap

Our home was built in the early 1970s and someone decided to use same relatively soft red brick at the threshold of the door as the rest of house’s exterior walls. I noticed in the fall of 2020 it was really starting to spall – meaning the brick was starting to flake apart. This happens when water gets in, freezes, expands and causes parts of the brick to crack and split. The above photo gives you and idea of what it looked like.

I did what I normally do – I started reading about how to stop spalling brick. The consensus was that sealing the brick before spalling started was the best approach but you know what – that really didn’t help me much because I already had spalling going on but the core of the bricks was intact.

Let me tell you something – there are a ton of brands of masonry sealer and based on the forecast, my procrastination was forcing me to get something applied within three days of cold weather really setting in. This meant and I had to rush and get something on-hand at a local store.

The closest hardware store to me is Ace so I want to the section where they had masonry sealers and started googling and reading reviews of each one that they had in stock. Again, I was pressed for time so I had to move. What I wound up buying was UGL DryLok Floor and Wall Masonry Sealer.

This is what I bought.

I got home, read the instructions, cleaned the brick off, put down a piece of cardboard to catch the drips and applied it fairly thickly with a painbrush taking care to daub it into all of the corners. The stuff seriously reminded me of Elmer’s Glue but not such a bright white.

This is the second coat. I applied the first coat the day prior and I took care to make sure I worked the sealer into all of the cracks.
I literaly laid down on my side and worked the sealer into every crack – including where the masonry was gone. I did this for both the first and second coat.

I let it dry overnight and then applied the recommended second coat . After drying, the bricks had a “wet” look to them – they were slightly darker and shinier than before but they appeared sealed. So, I crossed my fingers and hoped it would at least make it through the winter and I would plan a new approach if it failed.

Okay, I am now writing this in June of 2021, about seven months later and the DryLok worked. Not one bit of new spalling and even more surprising, the sealer looks the same. I can’t say that I see any wear in teh shiny finish. I guess now I will just wait and see how long it holds up.

THis photo is from June 21, 2021. No new spalling and the sealer does not show any sign of wear. You can see that the wet look faded as the sealer dried but the bricks are still slightly darker and shinier than the uncoated bricks. All of the bricks in this photo were coated by the way both the top protruding threshold and all of the bricks underneath it.

I Was So Impressed I Used It On Our Chimney Cap

A project on my list for this June was to seal my poured concrete chimney cap. It was starting show some surface cracks and when I ran my hand across it, I could feel loose grains of sand. It definitely needed to be sealed.

Guess what I used? I bought a gallon of the DryLok to do the threshold and only used a tiny amount to do it. I went and got the gallon and used over half of it applying two decents coats to the chimney cap and flue covers. We’ll see how long it holds up but I suspect it will be a few years at least given the threshold.

You want to protect the integrity of your chimney cap as it prevents water from running down into your chimney and causing the bricks to crumble. We replaced the original cap with this new one about 3-5 years ago and the sealer I applied then was long gone. I honestly don’t recall what I used.
That crack is what got my butt in gear to get up and seal the cap. As with the threshold, I applied the recommended two coats and I do put it them on iberally. It was scorching hot up there so the sealer dried fast but I still waited until the next day to put on the second coat.
If I can take an easy path I will. I noticed the caps to the flues were starting to rust so I sealed them as well. I was there … I had the sealant … it just seemed a lot easier than going down to the shop, getting black Rustoleum, climbing back up, etc. We’ll see how it holds up – that is a pretty brutal surface when you think about it – full sun and heat in the summer and full sun and cold in the winter … time will tell.

In Summary

The UGL DryLok Floor and Wall Masonry Sealer did a great job stopping the spalling of our front door’s brick threshold and it made it through one winter. Given how it performed, I just used it to seal our chimney cap and we’ll see how long it lasts there as well.

I hope this helps you out.


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