Lintel and Sill Replacement in Dayton

Lintel replacement in Dayton costs $400 to $1,500 per opening and sill replacement $300 to $1,200 each: the brick above the opening removed, the rusted steel lintel replaced with a new section with proper bearing, flashing, and weeps, the brick relaid, and the joints repointed. A stair-step crack rising from a window corner is the classic sign, and it is the one masonry failure in Dayton that repointing cannot fix. Send a photo of the crack and the lintel under it and you get a real diagnosis and a number.

What a lintel does, and how it fails

Every opening in a brick wall needs something to carry the brick above it. On Dayton’s 19th-century houses that is a stone lintel, a brick arch, or a shallow jack arch. On the brick veneer houses that fill Kettering, Huber Heights, Beavercreek, and Centerville from the 1950s on, it is a steel angle sitting on the brick either side of the opening.

Steel rusts. A steel lintel on a mid-century house was often set bare, without primer, without flashing over it, and without weep holes to drain the cavity behind the veneer. Water that gets behind the brick, and water always gets behind brick veneer, runs down the cavity and sits on the lintel. Dayton gives it 41.33 inches of normal annual precipitation to work with and, by the Federal Highway Administration’s count for Ohio, roughly 110 freeze-thaw cycles a year to keep the steel wet and moving. Rust occupies several times the volume of the steel it consumes. The lintel swells, and the brick above it has nowhere to go but up.

The result is the signature Dayton step crack: it starts at the top corner of the window, follows the mortar joints up and outward in stairs, and often opens a horizontal gap right at the lintel line. The brick directly above the opening may bow outward. Rust stains streak the brick below. On a house where the lintels were all set the same year by the same crew, the cracks show up over several windows on the weather sides within a few years of each other.

Lintel or settlement?

Not every step crack is a lintel, and the two cost very different money, so this matters:

• Lintel crack. Starts at the top corner of an opening, steps upward, worst on the north and west faces, rust staining below the lintel, a visible bow in the steel, and the crack tends to close a little in a dry August and open in a wet April as the rust wets and dries.
• Settlement crack. Starts low, often at a lower window corner or the foundation, runs diagonally toward the corner of the house, appears at more than one opening on the same side, and may show inside as cracked plaster on a diagonal. The Miamian clay under Montgomery County swells with a spring water table 2.5 to 3.5 feet down and shrinks dry, and a footing riding it moves. That is a drainage and foundation question, and the foundation page starts there.
• Both. Old houses have both, and we say so rather than sell one fix for two problems.

The blog post on step cracks over windows walks through the diagnosis with the questions we ask from photos.

How a lintel replacement goes

1. Shore and open. The wall above the opening is supported, and the brick above the lintel is removed course by course, saved where it is sound, and the cavity cleaned out.
2. Remove the steel. The old lintel comes out. On veneer walls the sheathing and house wrap behind it get inspected, because the rusted lintel has been holding water against them for years.
3. Set the new lintel. A galvanized or primed steel angle sized for the span, bearing at least several inches onto sound brick each side, set on a mortar bed. Flashing is lapped over the lintel and turned up behind the veneer so water that reaches it drains outward, and weep holes are left in the first head joints above it.
4. Relay the brick. Saved brick goes back in matched mortar, with replacements from salvage where units cracked, toothed into the existing courses so the repair does not read as a patch. See the brick repair page for matching.
5. Repoint the crack line. Now that the cause is gone, the step crack gets cut out and repointed to depth. On a mid-century house that is Type N; on an older wall it is a lime mix.

On a 19th-century house with a stone lintel that has cracked at midspan, the repair is different: the lintel is either pinned and patched as a stone repair, or replaced in kind with new limestone cut to the profile. The stone page covers it.

Sills

Sills fail from the same water. A limestone or cast-stone sill under a window is supposed to throw water clear with a drip groove; when the groove is clogged or missing, or the sill has cracked and tipped, water runs under it and down the wall, keeping the brick below wet through every freeze. The brick rowlock sills on mid-century ranches lose their joints and their outer course first. Repairs run from patching and resetting to replacement in matched stone or brick, $300 to $1,200 each, and a sill and a lintel at the same window get done in one visit because the scaffold is already there.

What it costs

Span, courses to be removed, and height set the number; a picture window on a second story with a bowed lintel is the top of the range. Several openings on the same elevation are cheaper per opening because the setup is shared. The pricing page has the full table.

Historic districts and permits

A lintel or sill replacement that keeps the opening the same size is a like-for-like repair, but it is still exterior work: inside one of Dayton’s 13 locally designated historic districts it needs a Certificate of Appropriateness (no fee, routine items through the Preservation Officer), and in Springfield’s two districts a replaced stone sill is a staff-level Review Process B calling for an exact match in the same material. Changing the size of an opening is a Major COA before the Landmark Commission and a different conversation. On permits, Montgomery County exempts non-structural repairs; a lintel carries load, so we confirm with the jurisdiction, whether that is Dayton, Kettering, Centerville, the county, or Greene County for Beavercreek, before opening the wall.

Timing

Lintel work follows the mortar season: wall temperatures between 40 and 95 degrees, so mid-April through October between Dayton’s average freeze dates of April 16 and October 25. A step crack is not an emergency in most cases, but an open crack that goes into winter takes on water, and a bowed lintel with loose brick above a doorway gets shored the day we see it.

We replace lintels and sills across Dayton and in Oakwood, Kettering, Centerville, Huber Heights, and Beavercreek. Send a straight-on photo of the whole window, a close-up of the crack with a coin for scale, and one looking up at the underside of the lintel from below.