Mortar does more than hold historic bricks together. It helps shed water and protects the edges of the masonry. Over time, weather, movement, and unsuitable past repairs can wear it down. Catching changes early can help prevent water from reaching the wall’s interior or damaging brick faces. Look closely at the joints between bricks, not just the overall appearance of the wall. The signs below can help you decide whether to monitor a change or arrange an assessment.
Look for Missing or Recessed Mortar
Check whether mortar has fallen out or sits noticeably deeper than the brick faces. Small gaps may appear first near corners, window openings, rooflines, and areas exposed to runoff. Use a flashlight and view the wall from several angles. Avoid scraping joints with tools to test them; aggressive probing can loosen sound mortar and damage fragile historic brick.
A few shallow, stable joints may call for observation, but widening gaps or repeated loss deserve closer attention. Missing mortar leaves joints more vulnerable to water entry and can reduce support between bricks. Note where the damage occurs and whether it changes after heavy rain or seasonal weather. Photos taken from the same position can help you track the pattern.
Notice Cracks and Loose Bricks
Fine cracks can form in mortar as a wall ages, but cracks that widen, run diagonally, or cross several joints may signal movement or another underlying problem. Watch for cracks above doors and windows, stair-step patterns through the joints, or a gap that keeps returning after repairs. These signs do not identify a cause on their own, so avoid treating them as a simple patching job.
Look for bricks that appear loose, bulging, or out of alignment with the surrounding wall. These changes can accompany failing mortar, moisture damage, or movement in the structure. If a brick shifts when touched, or the wall seems to be bowing, keep people away from the area and arrange a prompt professional assessment. Do not try to push bricks back into place.
Watch for Moisture and Brick Damage
Persistent damp patches, white powdery deposits, or mortar that stays wet long after nearby areas dry can point to moisture moving through the masonry. Check for clogged gutters, leaking downspouts, and ground or paving that directs water toward the wall. Fixing the water source may be as important as repairing the joint; otherwise, new mortar can deteriorate again.
Pay attention to brick faces that are flaking, scaling, or breaking apart. This damage can occur when moisture gets into the masonry and freezes, or when a hard, incompatible repair traps moisture in softer historic brick. Powdering mortar and brick fragments on the ground are also reasons to seek advice. A restorer can assess the full wall and distinguish surface wear from active deterioration.
Know When to Call a Restorer
Ask a historic masonry restorer to assess the wall when mortar loss is widespread, cracks are growing, bricks are loose, or water keeps entering the building. An assessment is also wise before repointing—removing and replacing deteriorated mortar—because the replacement needs to suit the existing brick and mortar. A mix that is too hard can stress historic bricks and cause their faces to break down.
Before the visit, take clear photos and note when you first noticed the change, whether it worsens in wet weather, and any previous repairs. Mention leaks, interior dampness, or recent building work. For a small, unchanged area with no moisture or movement concerns, keep monitoring it and maintain gutters and drainage. If you are unsure, Savannah Stoneworks can help assess historic brickwork in Savannah.
Missing mortar, widening cracks, loose bricks, and recurring moisture are practical reasons to look more closely at historic brickwork. Avoid quick fixes until you understand the cause and the materials involved. Keep dated photos, address drainage issues, and contact a qualified masonry restorer if the damage is spreading or you are uncertain about its severity.