Crumbling or missing mortar between brick: what it means and what it costs

Mortar that powders out under a key, drops sand at the base of the wall, or has left the joint open behind the brick face has lost its binder and needs repointing, not patching. In Evansville that repair runs $8 to $14 per square foot on hard post-war brick and $12 to $20 per square foot on soft pre-1930 brick that has to be hand-raked and repointed in lime mortar. A single two-story elevation is usually $1,500 to $6,000, and our jobs carry a $500 to $800 minimum. Send photos and you get the number without a walk-through.

Check this first (ten minutes, one key)

1. Drag a key along a joint at eye level, then at the bottom of the wall, then on the north side. Sound mortar resists the key. Bad mortar powders and leaves a groove.
2. Measure the recess. Hold a straightedge across two bricks. If the joint sits more than about a quarter inch behind the brick face, water is already sitting in it.
3. Look up and look for the water source. A failing wall usually has a reason above it: a downspout dumping on the brick, a missing chimney cap, a cracked crown, a failed sill, or a gutter that has not run in five years. Repointing under a live leak buys you two years.
4. Check the worst-first list in order. Chimney above the roofline, parapet or wall cap, north and west elevations, then the courses right above grade. Those fail years ahead of the rest of the house.
5. Push on a few bricks. If any unit moves, stop reading and get it looked at.

What is usually wrong

Every number above is the same range published on the pricing page, and the tuckpointing service page walks through the repair step by step. If you want a number before you talk to anyone, run the tuckpointing cost estimator.

Why Evansville eats mortar joints

Two local facts do most of the damage. Freeze-thaw: NOAA’s 1991-2020 normals for Evansville Regional Airport count 92.6 nights a year at or below 32 degrees against only 15.5 days that stay frozen, so roughly 77 times a winter the wall freezes overnight and thaws by afternoon. Water in an open joint expands each time, opens the joint a fraction wider, melts, and draws in more water for the next night. Rain: normal annual precipitation is 45.31 inches, and the wettest months are March at 4.60 inches, April at 5.14, and May at 5.12, right when the wall is still seeing freezing nights (March averages 11.9 of them).

Then there is what the wall was built with. Brick laid here before about 1930, which is most of Riverside, Bayard Park, Haynie’s Corner, Goosetown, and Lamasco, was set in lime mortar. Preservation Brief 2 notes that Portland cement was patented in 1824, first made in the United States in 1872, and not in common use until the early 20th century, so mortar in a house from 1873 to 1930 can be anything from pure lime and sand to a blend. Lime mortar is supposed to erode: it is the sacrificial part of the wall. Joints eating back on an 1890s house while the brick faces stay sharp is the system working, and the fix is a matched lime repoint, not a harder mortar. The mortar comparison page explains the difference in one screen.

When it is structural, not cosmetic

Mortar loss becomes a structural conversation when any of these show up: a brick you can rock with your hand, joints open more than half an inch deep across a whole area rather than a few feet, a wall that no longer reads straight when you sight down it, or step cracks climbing from a window corner. Those last two are different problems with different repairs, covered on the bowing brick wall and step cracks pages. In a historic district, also check the review rules before anyone starts grinding: the Evansville masonry rules page covers what needs a certificate and what counts as ordinary maintenance.

What to expect on the call

Send a wide shot of each bad elevation, a close-up of the worst joints with a coin in frame for scale, and the chimney from the ground. You get back a diagnosis, a scope, and a number from the ranges above. Ask that the quote name three things in writing: how deep the joints will be ground, what mortar type goes in, and which joint profile it will be tooled to. A bid that will not say those three things is not cheaper, it is a different job. Work runs April through November here, because mortar should be placed with wall temperatures between 40 and 95 degrees.