Chimney crowns assessed and repaired in Whisper Walk

We tell you what can stay on your chimney top and what has to come off, with the reasons.

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When the crown at the chimney top needs work

Concrete chips in the gutter
Dried or split caulk around the flue
Water marks on a ceiling beside the chimney
Crown and brick separating along the top course

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Getting the chimney crown right in Whisper Walk

How crown curing time depends on the weather

Crown coatings and new concrete both need time to cure. The coating data sheet gives curing times that vary with temperature. A surface that feels dry to the touch has not always finished curing.

We leave you with instructions based on the material actually used. They cover when the fireplace can be used again and when the cap or other parts can be touched. If another trade plans to work on the roof soon, tell us so the new surface is not disturbed while it cures.

A gap between the crown and the brick

Sometimes the crown separates from the top course of brick. A dark line opens along the joint, or the crown rocks slightly when pressed. Water can then run under the crown and into the wall.

The gap may come from failed bedding mortar, movement or loose brick below. We look at which one it is before proposing work. A crown that is sound but loose may be reset. A crown sitting on loose brick needs the masonry addressed first, which is priced as its own item.

Removing an old crown without loosening brick

Breaking out a failed crown needs control. The aim is to remove the unsound concrete while leaving the brick below and the flue liners undisturbed. Heavy-handed demolition can loosen the very courses the new crown must sit on.

We remove old crown material in sections and check the brick as it is exposed. If a liner or a course of brick is already loose, we stop and explain before going further. The estimate describes the removal method so you know what to expect on the day.

Mortar joints just below the crown

The mortar joints in the top courses of brick can wear before those lower down. They sit right under the crown and take water whenever the crown fails. Open joints there let water into the wall even after the crown is repaired.

We check those joints as part of the crown inspection. If they need repointing, that is joint work with its own line on the estimate. Doing it at the same visit can make sense because access is already in place, but you decide whether to include it.

Separate lines for crown, cap and flue

Slope and drainage off the top
Debris removal and haul-away
Workmanship warranty on agreed crown work
Sealant type and backer material at the flue

Crown repair answers for Whisper Walk

Is a mortar wash on top of my chimney the same as a crown?

It sits in the same place, but a thin sloped mortar topping is not built like a formed crown. Brick industry guidance warns that thin, feathered edges are more prone to deterioration. We check whether yours can be coated or should be replaced.

How is debris from the old crown handled?

Broken concrete is lowered from the roof with care, and the work area is cleaned. We haul the debris away. Should the job pause with the chimney top open, we fit a cover over it before leaving and keep it there until work resumes.

Do you seal the crown and the chimney brick at the same visit?

They are separate products and decisions. A crown coating treats the top surface. A water repellent for brick is considered only after cracks and joints are repaired, and it should let the masonry breathe. Each appears as its own line.

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Chimney & Fireplace Brands We Work With

DuraVent
Olympia Chimney and Venting
Copperfield Chimney Supply
Rutland
Heatilator
Heat & Glo