Most homeowners call us about the brick. Nine times out of ten, the brick is fine. What has failed is the thin line of mortar between it — and mortar is the part of a wall that is supposed to give up first.
That sounds like bad news. It isn't. A wall shedding its mortar is doing exactly what it was built to do. The expensive problem starts when nobody replaces it, or when somebody replaces it with the wrong material. Here is how to tell where your wall sits.
01 / DefinitionWhat repointing actually is
Repointing means cutting out the outer layer of failed mortar and packing fresh mortar back into the joint. Nothing is torn down. The brick stays where the original mason set it. Typically we remove 3/4 in. to 1 in. of depth — roughly twice the width of the joint — because shallow mortar smeared over old mortar pops out within two winters.
You'll also hear "tuckpointing," and most contractors use the two words interchangeably. Strictly, tuckpointing is a finish technique using two mortar colours to fake crisp joints. What your house needs is repointing.
02 / DiagnosisFive signs your joints are done
Walk the perimeter on a dry day with a key in your hand. Look for these:
- 01The key test failsDrag a key across a joint. If mortar crumbles into sand, that joint has lost its binder.
- 02Open head jointsVertical gaps you can slip a coin into. These are direct water entry points.
- 03Sand at the base of the wallA fine grey line along the foundation after rain means the wall is washing itself away.
- 04White chalky bloomEfflorescence is salt carried out by water moving through the wall. It marks a leak path, not a stain.
- 05Stair-step crackingCracks tracking diagonally through joints point to movement — diagnose that before pointing anything.
One or two soft joints on a chimney is maintenance. A full elevation of soft joints on the weather side is a project, and it does not get better on its own.
Brick can last a century. Mortar is designed to fail first — that's the entire point of it.
Daniel Reyes · Field Supervisor03 / MaterialsWhy hard mortar breaks soft brick
This is the part that costs people real money. Mortar is meant to be softer than the brick around it. It absorbs movement, freeze cycles and moisture, then sacrifices itself instead of the masonry unit.
Modern Portland-heavy mortar is harder than the soft, low-fired brick used before roughly 1930. Put that mix into an old wall and the brick becomes the weak point. Water gets trapped, freezes, and blows the face straight off the brick — spalling. Replacing spalled historic brick costs several times what correct mortar would have.
04 / StandardWhat a correct job looks like
Ask any contractor for these six numbers before signing. If the answers come back vague, keep interviewing.
- Cut depth
- 2× joint width, 3/4 in. minimum
- Removal method
- Hand chisel or dust-shrouded grinder; head joints by hand
- Mortar type
- Type N or O for pre-1930 brick; lab-matched on historic work
- Joint packing
- Layers of 1/4 in. max, each thumbprint-hard before the next
- Cure
- Kept damp 72 hrs, covered against sun and wind
- Temp window
- 40–90°F for 24 hrs before and 72 hrs after
Pre-1930 solid brick almost always wants Type N or Type O. Type S and Type M belong in foundations and load-bearing modern work — never on the face of an old house.
05 / CostWhat it costs, and what moves the number
Residential repointing generally runs $12 to $28 per square foot of wall face. The spread is wide because four things drive it: access height, how much of the joint has to come out, whether the mortar needs matching, and how brittle the brick already is.
What pushes a quote up
Anything above the second storey needs staging rather than ladders. Historic districts often require mortar analysis and an approved sample panel. Walls where the last repair used hard mortar take longer to open up without damaging brick faces.
What keeps it down
Catching it early. Spot repointing one elevation while the joints are merely soft costs a fraction of rebuilding a wall after water has reached the interior wythe.
06 / Next stepWhen to call someone
Call when the key test fails across a whole elevation, when you can see daylight or open head joints, when brick faces are flaking, or when a chimney is shedding sand into the gutter. Call sooner if a crack is stair-stepping — that is a structural question first and a mortar question second.
We walk the property, test joints by hand, photograph what we find and hand you a written condition report with the spec above filled in for your wall. You keep the report whether or not you hire us. Book a site assessment and we'll tell you honestly if it can wait a season.
