Old 12-23-02, 07:14 AM
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Looking to seal/waterproof my chimney brick/masonary. What is the best method? Can I do it in the winter? How long to cure? Any information most appreciated.
Old 12-23-02, 06:41 PM
Doug Aleshire's Avatar
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I have attached one link for products available but this is all going to depend on where you go to select product. The issue of sealing this in the winter is not a good idea, review product specs and application instructions.


General Information on Sealers;

On newer brick apply once every 5 to 10 years. On older brick, where the surface is porous the sealant will have to be applied more frequently, such as every 4 to 7 years.

The length of time between coats will depend on the porosity of the brick and weather conditions (prevailing winds, etc.).

Chimneys will need the sealant applied more often than the brick work of the house. Chimneys tend to deteriorate due the fact that they get wet and stay wet for longer. Blowing winds then force rain water into small cracks in the bricks or the pointing. Any freezing will then cause the bricks and the mortar to crack

The sealant will need to be reapplied when water no longer forms "beads" on the wet surface but again this will vary with product.

The sealant penetrates the brickwork and forms an invisible barrier protecting the brick against moisture penetration and attacks of airborne pollutants. What's more, the sealant resists dirt accumulation and retards the formation of efflorescence.
It is also breathable and water-based.

Apply using a hand pump sprayer, goes on fast and easy.

Hope this helps and have a Merry Xmas!

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