Brick Tuckpointing & Repointing

Signs that mortar needs attention

Look for crumbling or sandy mortar, gaps wide enough to fit a coin, cracks between bricks and bricks that are loose or spalling. Water stains, efflorescence and moss are clues that water is entering the wall. A mason probes the joints, checks the brick and notes the mortar color and tooling. They may test the mortar to match strength, since a mortar harder than the brick can damage it. Early repointing is far cheaper than rebuilding a wall. Ask the mason to prepare a sample patch of mortar in an inconspicuous spot, so you can approve the color and joint style before the whole wall is done.

Why matching mortar matters

Old brick walls were built with softer lime mortars that flex and breathe, and modern portland cement mortar can be too hard and trap moisture. Using the wrong mix can crack bricks and speed up deterioration. A good mason mixes mortar that matches the original in color, texture and strength, and tools the joints to the original profile. Sample patches show how the result will look before the entire wall is done. Keep an eye on gutters, flashing and grade near the wall, because water is what destroyed the old mortar and it will attack the new work if not corrected.

The process and what to expect

The mason grinds or chisels out the old mortar to a proper depth, usually about twice the joint width, cleans out dust and dampens the joints. New mortar is packed in layers and tooled when firm. The work is done in sections to avoid staining, and the wall must be protected from rain and frost while the mortar cures. Dust from grinding is significant, so protect windows and plants. Repair flashing, gutters and drainage to keep water away. Plan the work for dry, mild weather, since mortar needs time to cure without rain or freezing, and ask the mason how they will protect fresh joints.

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