How to Tell if Your Brooklyn Brownstone Needs Brick Pointing

If you own a Brooklyn brownstone, the question is not whether it will need repointing — it's when. Here are the six signs that tell you the clock has run out.

1. Mortar joints you can scrape with a key

Take a house key, drag it across a mortar joint on the front facade. If you walk away with a pile of sand on the sidewalk, the binder has failed. That's the most basic test — and the most reliable.

2. Water staining on interior walls

Stains on the top-floor ceiling or the inside of an exterior wall mean water is passing through the facade. Brick is supposed to absorb and release moisture seasonally; failed mortar shortcuts that cycle and pushes water inside.

3. Spalling — face shells popping off brick

When the front face of a brick pops off and leaves a rough crater, that's spalling. It means water got into the brick, froze, and blew the face out. The cause is almost always failed mortar above the affected course.

4. Efflorescence — the white powdery streaks

White powdery streaks running down the facade are mineral salts deposited as water evaporates out of the wall. By itself it isn't structural — but it means water is moving through your masonry where it shouldn't be.

5. Hairline cracks tracking through joints

Cracks that follow the stair-step of mortar joints are a settlement or thermal expansion signal. Cracks that go straight through the brick itself are more serious and require a structural look.

6. Loose or missing joint sections

Any joint where you can see gaps between bricks, see the dark interior of the wall, or pull pieces of mortar out with your fingers is past due. At that stage you are no longer preventing damage — you are repairing it.