A century of West Michigan freeze-thaw, two or three reroof events, and a stack of masonry that moves on its own schedule. The flashing in the middle is where almost every Heritage Hill leak begins.
Quick answer: Chimney flashing is the single highest-failure penetration on a Heritage Hill roof, and it is the most common cause of an interior leak on a century-old Grand Rapids home that otherwise has a sound roof field. Proper flashing means four integrated components: step flashing interwoven with each shingle course, counter flashing seated into a sawn reglet in the brick, a downhill apron, and a cricket on the uphill side of any chimney wider than 30 inches. Roofing tar around a chimney never solves the problem. The honest 2026 cost to flash a single Heritage Hill chimney correctly during a roof project runs 1,400 to 3,200.
A masonry chimney is the only thing on the roof that moves independently from the rest of the structure. The brick stack settles, expands, and contracts on its own thermal and moisture schedule. The roof deck moves with the rest of the house. The metal between them has to absorb that differential movement for decades. On a Heritage Hill home built between 1880 and 1930, that movement has been compounded by a century of West Michigan freeze-thaw cycles, mortar degradation, and at least two or three reroof events that may or may not have respected the flashing detail.
The numbers from our service calls tell the story. Of the leak diagnostic visits we run on Heritage Hill homes in any given year, the chimney penetration is the source on roughly 60 to 70 percent of them. The roof field itself, the valleys, the eaves, the rakes, even the skylights, all combined account for the remainder. The chimney leads by a wide margin.
The reason is not that the chimney is uniquely vulnerable. The reason is that proper chimney flashing on a historic masonry chimney requires more skill, more time, and more material than any other detail on the roof. When a reroof gets value-engineered, the chimney is where the corners get cut.
Four integrated components, all required on a Heritage Hill rebuild, all of them metal, none of them tar.
Step flashing is individual L-shaped pieces of metal, typically 5 by 7 inches in 26-gauge galvanized or 16-ounce copper, woven into the courses of shingles as they run up the side of the chimney. Each piece laps the one below it, with the vertical leg standing against the brick. The metal is mechanical and engineered to absorb the small movement between the shingle field and the brick stack. One continuous piece of L-flashing run the full height of the chimney is not step flashing. It looks similar from a distance, fails predictably within a decade, and is the most common shortcut on a fast install.
Counter flashing is the metal that laps down over the step flashing from above, sealing the joint to the brick. Done right, the counter flashing is bent into a sawn reglet, which is a horizontal groove cut into the brick joint with a masonry saw at the right elevation. The metal seats into the reglet, is wedged with lead or stainless wedges, and is sealed with a polyurethane sealant rated for masonry-to-metal joints. Counter flashing surface-mounted with screws and caulk to the face of the brick is not reglet flashing. It looks similar and fails when the caulk shrinks, which is three to five winters on a West Michigan chimney.
The front apron is a single bent piece of metal on the downhill face of the chimney, with at least 4 inches of upturn against the brick, at least 4 inches of roof leg integrated into the shingle field, and side wings that tuck under the lowest course of step flashing. The apron carries water away from the chimney face and onto the shingle field below. Shortcuts here include too-short upturns (water back-flows into the joint) and missing wings (water tracks around the corners and into the step flashing seam).
Any chimney wider than 30 inches at the roof intersection requires a cricket, also called a saddle, on the uphill side. A cricket is a small framed and shingled hip that diverts water and snow around the chimney rather than letting it pile against the uphill face. On Heritage Hill, where many original chimneys are 36 to 60 inches wide and the roof pitches are steep, the cricket is often the difference between a chimney that stays dry through a hard winter and one that backs water and ice into the flashing. The cricket is the single most-skipped detail on a fast Heritage Hill reroof, and the omission is responsible for a meaningful share of the ice-and-water damage we see on uphill chimney walls.
A masonry chimney moves differently from the surrounding roof. The brick expands roughly twice as much as the roof framing in summer heat and contracts proportionally in winter. The mortar joints absorb moisture and release it on a seasonal cycle. The chimney's interior, depending on whether the fireplace is in active use, can swing fifty degrees of temperature from morning to evening.
Roofing tar is a surface seal. It does not absorb differential movement, it does not flex through a freeze-thaw cycle, and it does not handle the moisture transmission through old brick. On a Heritage Hill chimney, a tar repair typically lasts one to three winters before it cracks and the leak returns. Often the homeowner does not see the leak come back right away, because by then the water is being absorbed by the deck sheathing and the ceiling below has been replastered. The damage continues quietly until it reaches a load-bearing rafter or a finished ceiling.
The right repair is always metal, mechanically integrated, with sealant only at the joint between the counter flashing and the brick. Tar is a stopgap. It has never been a solution on a Heritage Hill chimney.
The right project sequencing usually pairs a chimney crown rebuild and re-tuckpointing with the flashing work. The reason is simple. New flashing has to anchor to brick that will hold a reglet for 25 to 50 more years. If the brick above the flashing line is failing, the flashing investment is wasted.
The order of operations on a typical Heritage Hill reroof with chimney work runs like this. First, inspect the masonry above the roofline for crown failure, spalling, mortar joint deterioration, and brick face damage. Repair or rebuild whatever is below standard. Cap the chimney with a properly sized cast or precast concrete crown with a drip edge. Re-tuckpoint any joints in the lower portion of the stack that have failed. Then, and only then, integrate the new step and counter flashing into the new courses of brick as the roof field goes back together. The mason and the roofer have to coordinate, which is why the right contractor for a Heritage Hill chimney project either has masons on staff or works with a longstanding masonry partner.
For the broader Heritage Hill cedar versus asphalt versus slate decision on the roof field itself, the Heritage Hill material decision guide covers the tradeoffs in detail. The HPC review process for any visible exterior change is in the HPC walkthrough. Both apply to chimney work as much as to the roof field.
Honest pricing for Heritage Hill chimney flashing work in 2026:
A homeowner staring at a 2,800 dollar chimney flashing line item on a Heritage Hill reroof bid is sometimes tempted to ask whether the existing flashing can be left in place to save money. The honest answer on a 100-year-old chimney is no. Whatever flashing is up there has either reached the end of its service life or was a shortcut to begin with, and reusing it under a new roof field is the single most common reason a freshly-shingled Heritage Hill home develops a chimney leak in the first three years.
Four signs to look for, in priority order:
Interior staining near the chimney. Ceiling rings, plaster discoloration, or peeling paint on the wall closest to the chimney chase, especially after a wind-driven rain or spring snowmelt. The water is rarely traveling far from the source on a chimney leak, so the interior staining is usually within a few feet of the chimney itself.
Attic staining at the deck. A look at the underside of the roof deck near the chimney penetration tells the story before the interior plaster does. Dark moisture rings, active staining, deck sheathing that is darker than the surrounding wood, white efflorescence on the brick face inside the attic. All of those indicate the flashing has been letting water through for some time.
Visible exterior failures. Rust streaks down the chimney face from steel flashing oxidizing, exposed nail heads in the counter flashing where movement has lifted the metal, gaps between the counter flashing and the brick where the reglet has failed or was never there, any tar visible at the joint indicating a previous panic repair.
Recent fast reroof. If the previous reroof was a sub-2-day job by a crew that did not address the chimney specifically, the flashing is almost certainly either reused or shortcut. Heritage Hill chimney work cannot be done correctly in the time it takes to lay shingles on the surrounding field.
The chimney is where almost every Heritage Hill roof leak starts, and the flashing detail is where almost every chimney leak starts. Doing it correctly means four integrated metal components, a coordinated mason and roofer, and a willingness to pay for the time and material that a century-old masonry penetration actually requires. The alternative is a roof that looks new from the curb and starts staining a ceiling within three winters.
If your Heritage Hill or downtown Grand Rapids home is approaching a reroof, or if you have a chimney leak on an otherwise sound roof, the integrated flashing scope is on our services page and the broader residential roofing approach is on the residential roofing page. We have been doing this work in Grand Rapids since 1994.
A masonry chimney is the only roof penetration that moves independently from the rest of the structure. The brick stack settles, expands, and contracts on its own thermal and moisture schedule, while the roof deck moves with the rest of the house. The flashing between them has to absorb that differential movement for decades. On a 100-year-old Heritage Hill home, that movement has been compounded by a century of West Michigan freeze-thaw cycles, mortar degradation, and at least two or three reroof events that may or may not have reset the flashing correctly.
Four integrated components. Step flashing in individual pieces interwoven with each shingle course up the sides of the chimney. Counter flashing cut into a sawn reglet (a horizontal groove) in the brick masonry, lapping down over the step flashing. A front apron on the downhill face with at least 4 inches of upturn and 4 inches of roof leg. A cricket or saddle on the uphill side of any chimney wider than 30 inches to divert water and snow around the stack. All four are required on a Heritage Hill rebuild. Skipping the cricket on a wide chimney is the most common shortcut.
A full flashing replacement on a single masonry chimney during a Heritage Hill roof project runs 1,400 to 3,200 in 2026, depending on chimney width, whether a cricket is required, and whether the existing reglet has to be cut new. A standalone chimney flashing repair (not part of a reroof) runs 1,800 to 4,500 because of mobilization and scaffold setup costs that get absorbed into the reroof when both are happening together. The cost premium over a fast caulk-and-pray repair is real and the return is decades of leak-free service.
Roofing tar is a surface seal. It does not absorb differential movement, it does not survive freeze-thaw cycling, and it does not handle the moisture transmission through old brick. On a Heritage Hill chimney, a tar repair typically lasts one to three winters before it cracks and the leak returns, often worse than before because the homeowner now trusts that the chimney is sealed and stops looking at it. Proper step and counter flashing is metal, mechanical, and engineered for the movement. Tar is a stopgap, never a solution.
Yes, both directions. A masonry chimney rebuild above the roof line breaks any existing flashing and requires new step and counter flashing to be integrated into the new brick courses. New roof flashing on a deteriorated chimney is only worth installing if the brick and mortar above the flashing line are sound enough to anchor the counter flashing for 25 to 50 more years. On Heritage Hill, the right project sequencing often pairs a chimney crown rebuild and re-tuckpointing with the flashing work, so the new metal sits in fresh masonry.
Look for water staining on the ceiling near the chimney, especially after wind-driven rain or spring snowmelt. Check the attic side of the roof deck near the chimney penetration for dark moisture rings or active staining. From the ground or a lift, look for rust streaks down the chimney face (steel flashing failing), exposed nail heads in the counter flashing (lifted by movement), gaps between the counter flashing and brick (reglet failure or no reglet), and any tar visible at the joint (a sign of a previous panic repair). Any of those four indicate the flashing has reached the end of its service life.
Roof Repair of Grand Rapids has been installing and repairing roof systems on West Michigan homes since 1994. Our crews handle Heritage Hill historic homes, downtown Grand Rapids stock, East Grand Rapids and Reeds Lake premium properties, and the Holland and Muskegon lakeshore. Chimney and masonry penetration work is one of the details we built the practice around, and we coordinate with longstanding masonry partners on Heritage Hill rebuild projects. Authoritative reference for the flashing detail: National Roofing Contractors Association (NRCA) publishes the industry-standard installation guidance for asphalt-and-masonry chimney flashing detail.