Your chimney may have a crown that has cracks in it, yet still has a good bond to the brick it was poured upon.
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 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 substrate
- Slightly flexible to seal static cracks
- Concrete and block wall foundations
- Water tanks
If you want to get technical about it, here is a link to the manufacturer’s data:
We have used this product for over twenty years, and it works great!