Choosing between crown sealing, repair, and rebuilding
The chimney crown sheds water away from the flue and masonry below. Fine surface wear on an otherwise sound crown may support a compatible coating or limited repair. Open cracks, missing sections, poor slope, movement, or deterioration in the upper masonry can require a more substantial repair or rebuild.
What the assessment should cover
A roof-level assessment should consider crack width and location, slope, overhang, flue-tile clearance, previous coatings, cap attachment, upper masonry, and signs of water entry. The recommended material and cure requirements should match the observed condition and the forecast.
Written scope before chimney crown repair
Ask for a written estimate that distinguishes sealing from structural repair, identifies any cap or masonry work, and states weather limitations, price, and any applicable product or workmanship warranty terms. If hidden deterioration changes the scope, approve the revision before additional work proceeds.