Last November I had the roof stripped and shingled and the chimney re-built above the roofline and the guy that did it said I should get up there and waterproof the chimney in the spring when it's warmer. Well it's spring and I want to do it but I was wondering what I should use? I have used Thompson's in the past(mixed results) but was wondering if that is the best stuff to use. What do the Pro's use? Thanks for any help.....
I capped mine to keep out water and animals and chimney guy sealed top with a waterproof grout where cement was getting crumbly.
I had my chimney tuckpointed a few years ago and the guy gave me the same spiel. He applied a sealant.
Well, 3 years later and all the pointed mortar has fallen out and I'm doing it myself this time. So I guess my comment would be, they've been building masonary houses for hundreds of years and didnt use sealants back then so what has changed to make them necessary now? It obvoisuly didnt work in my case.
Back to your question. I was just in Home Depot buying new mortar and saw gallon jugs of Masonary/Concrete Sealant sitting on the shelve next to the bags premixed mortars. I'd use that. I'd never use Thompsons due to past bad experiences.
-dickm
I had the chimney COMPLETELY torn down to just below the roof line and re-built with new brick,flashing ect. The bricks on the old chimney were like yours was falling apart...700 bucks well spent..IMO...
Brick and mortar must breath or water can be held in and freeze and ruin brick, chimneys go bad from in and outside, inside if the cap and no liner is used
Thompsons is paraffin in an organic solvent. I used it on a deck...once about 20 years ago. A mistake I won't make again. There are several good masonry sealers available that are made from heavy silanes. They are a much more appropriate choice.
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