Chimney Crown: Repair or Recast?

The Crown Is Where Most Chimney Leaks Start

The crown is the concrete or mortar cap poured across the top of a brick chimney, surrounding the flue tile, and it keeps rain off the masonry below. When it cracks, rain runs into the chimney and down through the masonry. You see it as a stain on the ceiling or wall next to the fireplace, rust on the damper, or flaking brick faces on the outside.

In Woodland Hills, crowns take a beating from heat more than cold. Summer roof temperatures bake the crown, and the cooler nights that follow make it shrink back. Year after year, small cracks open. Many crowns on 1950s and 1960s ranch houses were also built the cheap way, as a sloped layer of mortar flush with the brick, with no overhang to throw water clear of the face. Those crack sooner and leak worse.

When a crown fails, you have three choices: seal it, patch it, or replace it. Each has a place.

Option One: Seal It

A flexible crown sealant is a thick coating brushed over the whole crown. It bridges hairline cracks and moves with the crown as it heats and cools. It is the cheapest option, takes a short visit, and buys several years on a crown that is basically sound.

Sealing makes sense when:

• - The cracks are hairline or narrow
• The crown is still bonded to the brick and does not rock or sound hollow
• Water has not yet done much damage to the brick below
• You want to buy time before a larger job, such as a roof replacement or a sale

Sealing does not make sense when the crown is broken through, loose, or crumbling. A coating on a failed crown is paint on a problem.

Option Two: Patch It

When one section of the crown has broken away but the rest is sound, the bad section can be cut out and patched with new crown mix, then the whole crown sealed. This sits in the middle on cost. It works on crowns that are thick enough to take a patch and that fail in one spot, often where a corner has taken weather from one direction.

Patches are a judgment call. On a crown that is already thin and flush with the brick, a patch often just moves the failure to the next weak spot, and you are better off recasting.

Option Three: Recast It

Recasting means breaking off the old crown and pouring a new one, properly formed, with an overhang and a drip edge so water falls clear of the brick face. A bond break is left around the flue tile so the tile and crown can move separately. It costs the most of the three and needs a dry day or two to cure, but it fixes the problem for a long time.

Recasting makes sense when:

• - The crown is cracked through or loose
• It was built flush with no overhang and keeps cracking
• Water has already damaged the top courses of brick
• You plan to stay in the house for years

If the top courses need repointing anyway, doing the crown at the same visit saves a second setup.

What Decides Your Price

Crown work is quoted after we see it, because the price depends on things you cannot see from the ground:

• - Size. A single-flue crown on a small chimney is a small job. A wide crown with two or three flues is not.
• Height and access. One-story roofs are quicker and cheaper to work on than two-story or steep roofs.
• Condition. Sealing a sound crown is quick. Breaking out a crown that has bonded to loose brick takes longer.
• What else is needed. A new cap, repointing the top courses, or resetting a loose flue tile are separate lines.

Before any crown work, we check the flue tile, the cap and the top courses of brick, because a crown is only as good as what it sits on. If the top flue tile is cracked or the cap is missing, those go on the estimate as separate items.

Send a Photo of Your Crown for a Written Quote

If you can safely take a photo of the top of your chimney, from a second-story window, a neighbor's yard or a ladder held by someone else, send it with a photo of any stain inside. Use the quote form and we will tell you whether it looks like a seal, a patch or a recast, and quote the visit. Please do not climb onto the roof for it. A photo from the ground with a zoom lens is often enough to see wide cracks.

Can Crown Work Wait?

Hairline cracks with no leak can wait a season, but they are worth sealing before the rains. A crown that is leaking should be dealt with before the next winter, because every storm takes water further into the brick. A crown that is loose or has pieces missing should be dealt with soon, because pieces can fall and the flue tile can shift.

If it is the middle of winter and water is coming in, we can apply a temporary seal to stop the leak and schedule a recast for the dry season. That way you are not forced into the biggest option in a storm.

Why a Cap Belongs in the Same Conversation

A crown-mount chimney cap covers the whole top of the chimney, crown included. It keeps rain off the crown as well as out of the flue. On a crown that is cracked but sound, a crown-mount cap plus a sealant coat can be a cheaper way to stop the leak than a recast, and it adds the spark screen that Woodland Hills homes need anyway with the Santa Ana winds. A cap installed runs $155 to $635, depending on size and type. We price the cap-and-seal route next to the recast when it is a fair option.

The Short Version

• - Hairline cracks on a sound crown: seal it.
• One bad corner on a thick crown: patch and seal.
• Cracked through, loose, or flush with no overhang: recast it.
• Cracked but sound and no cap: a crown-mount cap with a seal may be the cheaper fix.

Book a Crown Check

A crown check is part of any Level 1 chimney inspection, which is $52. You get a written note on the crown with a photo, the options that fit it, and a price for each. To book, call us using the phone number on this page, or send the form with your photos.