Chimney tuckpointing — or repointing, as it is interchangeably called in Melbourne — is the process of raking out deteriorated mortar from the joints between chimney bricks and filling them with fresh mortar. Over time, the original mortar erodes, recedes and cracks, allowing water to penetrate the masonry. Left long enough, this moisture drives spalling brickwork, internal damp, and accelerating structural deterioration. Addressing it while the joints are eroded but the bricks are intact is far cheaper than repairing the damage that follows.
What Tuckpointing Is
A masonry chimney is built with bricks held together and separated by mortar joints. The mortar is deliberately the weaker element of this pairing — it is designed to absorb movement and weathering so the bricks themselves are protected. Over decades, mortar erodes, shrinks and cracks while the bricks remain largely intact. Tuckpointing restores the joints, re-establishing the weather seal and structural continuity.
The process: a grinder or chisel rakes out the deteriorated mortar to a consistent depth, the joints are cleaned, and fresh mortar is packed and tooled to match the original profile. The mortar mix matters critically — it must be compatible with the existing brickwork. Using a mortar that is too hard or cement-rich can cause bricks to spall as they cannot flex relative to the joints, which is worse than the original erosion. This is the main reason chimney tuckpointing should be done by someone who understands heritage and period masonry, particularly common in Melbourne's older housing stock.
When Your Chimney Needs It
Mortar erodes gradually, which means the question is less whether your chimney needs tuckpointing and more how urgently it needs it.
Inspect with a screwdriver: if you can gouge mortar out of the joints with moderate finger or screwdriver pressure, or if the mortar has visibly receded more than 6mm behind the face of the brick, repointing is overdue. Check for efflorescence: white salt deposits on the chimney exterior indicate water is moving through the masonry and evaporating, which requires open or porous joints to occur. Look for spalling: bricks that are flaking or delaminating at the face have been saturated repeatedly, usually because joint erosion has allowed water in.
Inside, the signs are damp patches on ceilings or walls near the chimney breast after rain, or a persistent musty smell. Because water travels through the masonry before appearing inside, the staining may be offset from the entry point. An annual professional inspection assesses mortar joint condition as part of the standard check — see the maintenance checklist.
The Tuckpointing Process
A professional repoint follows a clear sequence that determines whether the result lasts.
Assessment: the extent of joint deterioration is mapped and the existing mortar analysed so the replacement mix can be matched correctly. Raking: deteriorated mortar is removed to a consistent depth — typically 15 to 20mm — using an angle grinder with a raking disc or a cold chisel, taking care not to damage brick faces. Cleaning: dust and loose material are cleared from the joints with compressed air or a stiff brush. Pointing: fresh mortar is packed into the joints in layers and tooled to the correct profile to match the original finish and encourage water shedding. Curing: the finished work is kept damp for several days to cure correctly, particularly in Melbourne's drier months.
The entire chimney is usually repointed in a single visit to ensure a consistent finish and avoid visible patching lines. For a chimney that also needs crown work or waterproofing, combining the work in one visit reduces access cost significantly — see common chimney repair costs.
Cost in Melbourne
Tuckpointing cost is driven more by access than by the repointing work itself. The labour of raking and refilling joints is time-intensive but not highly variable — getting to the chimney safely is where the cost diverges.
A minor repoint of a few deteriorated courses on an accessible single-storey chimney costs roughly $500 to $800. A full repoint of all exposed joints on a single-storey chimney runs $800 to $1,500. A two-storey chimney or one requiring scaffolding or an elevated work platform — common on Melbourne's taller period homes — can reach $1,500 to $2,500 or more. Hip roofs, the dominant style in Melbourne suburbs, make roof access more complex and expensive than simple pitched roofs.
As with all chimney roof work, the most efficient time is during the annual service when access cost is shared, or when other roof-level work is being done at the same visit. Combining tuckpointing with crown repair or waterproofing in one mobilisation saves meaningfully versus separate visits.