Brick Repointing Questions & Answers

Repointing is the process of raking out deteriorated mortar from the joints between bricks and replacing it with new mortar. The bricks themselves stay in place — it is the joints that are renewed. Done properly, the new mortar is matched to the original in colour, texture and joint profile so the wall looks the way it always has, only sound again.

Look closely at the joints rather than the bricks. Mortar that has weathered back behind the face of the brick, joints with gaps or missing sections, mortar that crumbles or leaves powder on your fingers when rubbed, and fine cracks running along the joint lines are all signs the mortar has reached the end of its service life. Other clues appear indoors: damp patches on internal walls, salt staining (efflorescence) on the outside, or mortar dust and grit collecting at the base of the wall. An inspection is the reliable way to confirm it, because a wall can look tired from the footpath and be sound, or look acceptable and be badly worn up close.

Mortar is softer than brick by design — it is meant to be the sacrificial element that absorbs movement. It cracks from ordinary causes: thermal expansion and contraction through Sydney's hot summers and cool nights, moisture cycles, minor settlement of the building, vibration, corroding steel lintels or wall ties expanding within the wall, and simple age. Cement-rich mortar used on an older home built for soft lime mortar is another common cause, because the hard mortar cannot flex and the stress transfers into the brick instead.

Usually it is a maintenance issue rather than a safety issue. Most mortar cracking is surface weathering and wear that lets water in over time. It matters because water entry accelerates damage, not because the wall is about to fail. Cracking becomes more serious when it is wide, stepped through both brick and mortar, growing over time, or accompanied by bulging, leaning or doors and windows that no longer sit square. Those patterns point to movement rather than weathering, and the wall should be inspected before any cosmetic repair is done.

Yes. The mortar joints are a large part of the external surface of a brick wall, and once they are cracked, recessed or missing, rain has a direct path into the wall. In a cavity wall the moisture may be managed for a while; in a solid brick wall it can show up as internal damp, blistered paint, musty smells or decaying timber. Water also feeds the deterioration itself — it dissolves the remaining lime, carries salts through the brick, and in cold snaps expands within the joint and opens it further.

There is dust and debris — raking out old mortar creates both. A careful contractor manages it with dust extraction or wet cutting where suitable, drop sheets, protection of windows, paths, gardens and outdoor furniture, and daily clean-up rather than one clean-up at the end. Expect some fine dust settling nearby while the work is underway; expect the site to be swept and washed down before the job is called finished.

Yes — Sydney winters are mild enough that repointing continues year-round. Mortar needs temperatures above freezing to cure, which is rarely an issue here. The real constraints are rain and driving wind, since fresh mortar can be washed out of the joint before it sets, and extreme heat, which dries mortar too fast and weakens it. Winter's cooler, slower curing conditions are in some ways better for mortar than the peak of summer.

It depends on the wall area, access, and how much associated repair work is involved. A single elevation is a much shorter job than a full house that also needs scaffolding, brick replacement and crack repair. Weather interruptions also affect the run. The realistic answer for any specific home comes after the wall has been inspected and the scope set, and a timeframe should be part of the written quote rather than a guess up front.

Like-for-like repair and maintenance of existing brickwork generally does not require approval. The situation changes if the property is heritage listed, sits within a heritage conservation area, or is covered by a specific development consent condition — in those cases the council may need to approve the work, and may have requirements about the mortar mix, colour and joint finish so the repair matches the original. If you are unsure of your property's status, check with your local council before work starts.

Yes. Chimneys are among the most exposed masonry on a house — weather hits them from every side and there is no roof above them — so they usually deteriorate before the rest of the brickwork. Typical work includes repointing, replacing spalled or fretted bricks, rebuilding the top courses where the mortar has gone, renewing the flaunching or capping, and dealing with the flashing junction at the roof. Where a chimney has become loose or unstable, a partial rebuild is the appropriate repair.

Yes. Steel lintels above windows and doors rust over time, and as the steel corrodes it expands, lifting and cracking the brickwork above the opening — often visible as a horizontal crack that follows the line of the lintel. Repair means supporting the brickwork above, removing the affected courses, treating or replacing the lintel, and rebuilding and repointing the brickwork. Painting over the crack does not stop it, because the corrosion continues behind the surface.

Yes — any repointing, crack repair or brick replacement should be completed and allowed to cure before painting. Painting over failed mortar seals in the problem and hides it, and the paint film will crack and lift as the mortar behind it continues to break down. It is also worth being cautious about painting brickwork at all: film-forming paints reduce the wall's ability to breathe, and trapped moisture is a leading cause of brick fretting.

Sound, well-matched brickwork is one of the first things buyers and building inspectors assess, and visible mortar failure reads as deferred maintenance across the whole property. Repointing restores the appearance of the facade and removes a finding that would otherwise appear in a pre-purchase inspection report. It is best understood as protecting the value and condition of the home rather than as a renovation that adds a specific dollar figure.

It can, where the water is genuinely entering through failed joints — restoring the joints restores the wall's primary weather barrier. But leaks also come from flashings, roofs, gutters and downpipes, cracked render, failed sealant around windows, blocked cavity weep holes and rising damp. Repointing a wall will not fix any of those. The right sequence is to identify where the water is actually entering, then repair that, with repointing as part of the solution rather than an automatic cure.

Brickwork is low maintenance rather than no maintenance. Keep gutters and downpipes clear and discharging away from the walls, keep soil, mulch and paving below the damp-proof course, keep plants and climbers off the brick face, and avoid pressure washing at high pressure — it erodes mortar and drives water into the wall. Wash down gently if needed, watch weather-facing and coastal walls more closely, and look over the joints once a year so small areas of deterioration can be repaired before they spread.