7 Signs Your Brick Needs Repointing

The seven signs

Walk your exterior on a dry day and look for these in order of severity.

Mortar you can scratch out with a key or screwdriver.
Joints recessed more than a quarter inch behind the brick face.
Sand or mortar dust collecting at the base of the wall.
White chalky staining, called efflorescence, on the brick face.
Brick faces flaking or popping off, known as spalling.
Damp patches or peeling paint on interior walls after rain.
Stair-step cracking through joints, which can signal movement.

Which signs are urgent

Spalling brick and interior dampness are urgent because both mean water is already inside the assembly. Each freeze-thaw cycle expands that water and breaks more material. In the Boston climate we see dozens of those cycles every winter.

Recessed joints and sand at the base are important but not emergencies. They give you a season to plan and budget.

Why mortar matching matters more than skill

A pre-1930 brick wall was built with soft lime mortar. Repointing it with modern portland mortar creates joints harder than the brick, so expansion pressure destroys the brick face instead of the joint. It is the single most expensive mistake made on historic Boston masonry.

Ask any contractor what mortar type they plan to use and why. The answer should reference the age of your building, not a default mix.

When to schedule the work

Repointing is best done between April and November, when mortar can cure above 40 degrees without protection. Book spring work in winter; the good crews fill their season early.