Waterproofing your chimney crown.

Several photos, then data.

Your chimney may have a crown that has cracks in it, yet still has a good bond to the brick it was poured upon.

Cracked chimney crown that is still bonded well to the brick.



A great way to remedy this problem, preserve the crown and protect it from future wear is to waterproof it with Tamoseal. Tamoseal is mixed with a mechanical mixer and is brushed on in two applications. The photo below is a of a crown that has been treated with Tamoseal:

Tamoseal brushed onto the crown-2 coats.


TAMOSEAL is a cement-based, polymer-modified material designed to waterproof and decorate concrete and masonry.


  • Waterproofs and decorates
  • Tenacious bond
  • Becomes an integral part of the substrate
  • Durable
  • Breathable
  • Slightly flexible to seal static cracks


  • Concrete and block wall foundations
  • Manholes
  • Water tanks
  • Reservoirs
  • Balconies
  • Interior/exterior

If you want to get technical about it, here is a link to the manufacturer’s data:

Tamoseal technical data

We have used this product for over twenty years, and it works great!



About the Author:

A 24-year veteran of the chimney repair trade, Cliff has experience in most phases of chimney construction and repair. He began as a chimney sweep apprentice in 1991. Two years later he began to educate himself in bricklaying and chimney construction. He claims that "it has been an interesting trade to say the least.
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