How to tell if your brick needs tuckpointing
Eight things to look for on a walk around your house — crumbling mortar, stair-step cracks, recessed joints, efflorescence and more — and which ones mean call now versus wait.
You don't need a mason to tell whether your mortar is failing — you need ten minutes, a flashlight and a house key. Here's the walk-around we'd do if we were standing in your yard, in the order we'd do it.
The 8 signs
- The key test. Drag a key across a mortar joint at eye level. Sound mortar scratches lightly. Failed mortar flakes, crumbles or dusts out. Try several spots — the weather side (south and west in Omaha) fails first.
- Recessed joints. Look along the wall at a low angle. If the mortar sits back ¼" or more from the face of the brick, it's eroded and water is collecting on every ledge.
- Stair-step cracks. A crack that climbs diagonally through the joints like a staircase. On a wall, it usually means the mortar has failed and the brick is shifting; on a foundation it can mean settling. Either way, get it looked at.
- Missing chunks or old patches falling out. Previous repairs that were smeared rather than repointed, now popping loose.
- Spalling brick. Faces flaking or popping off the brick. Usually means water got in and froze — often because hard mortar forced the moisture into the softer brick.
- Efflorescence. White, chalky staining on the brick. Water is moving through the wall and leaving salts behind. Cosmetic by itself, but a sign the joints aren't shedding water.
- Loose or rocking brick. Push on a brick near a failed joint. If it moves, don't wait.
- Water inside. Damp drywall on a brick-backed wall, a musty basement corner, or water along a brick foundation after rain. Failed mortar is a common culprit.
Where to look first
- The chimney — above the roofline, the top few courses and the crown. Most weather, fails first.
- Under window sills and above garage doors — steel lintels rust, swell and crack the joints around them.
- The grade line — the bottom two feet of a brick or block foundation, where splash-back and snow sit.
- Corners and parapets — exposed on two sides.
- Anywhere a downspout or gutter dumps water on the wall.
Call now vs. watch it
| What you found | What it means | Urgency |
|---|---|---|
| Loose brick, water inside, crack wider than ¼" | Active failure, water getting in | Call this week |
| Crumbling mortar, stair-step cracks, spalling | Mortar has failed; damage compounds every winter | Call before the freeze |
| Light recession, efflorescence, hairline cracks | Early wear | Get a free look; it may be a small job or a "wait a year" |
If you're not sure which bucket you're in, text Jake a couple of photos. He'll tell you straight, and if it can wait he'll say so. Omaha tuckpointing →
Related questions
A few more answers.
Is a hairline crack in mortar a problem?
Not by itself — mortar is supposed to crack before brick does. It becomes a problem when water can get in and freeze. A hairline crack on a protected wall can wait; the same crack on a chimney or at the grade line should be sealed or repointed before winter.
How often should brick be inspected?
Walk it every fall before the freeze. Have a mason look at the chimney and foundation every 5–10 years, sooner on pre-1940 homes.
Ready for a straight answer on your house?
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