Heritage Stone & Brick Repointing

Authentic Stone specialises in full-facade and large-scale heritage stone repointing rather than isolated patches or minor mortar repairs. As a general guide, we do not quote on single-wall patches, individual damaged joints or projects involving less than approximately 20 linear metres of repointing. Small repairs can leave a facade with mismatched mortar colours, textures and joint profiles while failing to address deterioration in surrounding areas. Our approach is to assess and restore the complete affected elevation, creating a more consistent appearance and a coordinated long-term result. Property owners requiring minor repairs are welcome to contact us for a referral to a trusted tradesperson within our network.

Matching heritage mortar involves assessing more than its colour. The original mortar’s strength, permeability, lime content, sand, aggregate size, texture and joint profile must all be considered. Samples and test areas may be used to develop a mortar that is visually sympathetic and physically compatible with the surrounding stonework. The depth of the joint, method of application, tooling and curing process also affect the final appearance. Because natural sands, aggregates and historic finishes vary between buildings, heritage mortar matching requires specialist judgement rather than the use of a standard premixed product. The objective is to create a consistent facade without producing a finish that looks excessively new or out of character.

Common signs that a heritage stone facade may require repointing include crumbling or powdery mortar, open joints, visible gaps, cracking, loose mortar and sections where the joints have eroded significantly behind the face of the stone. Dampness, salt deposits, staining and deterioration around hard cement repairs may also indicate that the wall is no longer managing moisture effectively. Because visible mortar failure can be connected to drainage, ground movement, rising damp or previous incompatible repairs, the entire facade should be assessed before work begins. This helps determine whether repointing alone is required or whether broader masonry restoration work should also be considered.

Lime mortar is commonly used in heritage stone repointing because it is generally softer and more breathable than modern cement-rich mortar. Traditional masonry walls were designed to absorb and release moisture through their mortar joints. A compatible lime-based mortar allows this process to continue while accommodating a degree of natural movement within the building. Hard or impermeable cement mortar can trap moisture and transfer stress into softer sandstone or historic brick, potentially contributing to cracking, surface deterioration and damaged stone edges. The appropriate mortar should always be selected according to the original materials, condition and construction of the building.

Heritage stone repointing is the process of carefully removing deteriorated or incompatible mortar from the joints of an older masonry wall and replacing it with a mortar suited to the original stonework. Unlike general mortar repair, heritage repointing requires an understanding of traditional construction methods, lime-based mortars, moisture movement and historic joint finishes. When completed correctly, repointing improves the appearance and weather resistance of the facade while helping to protect the surrounding sandstone, bluestone, limestone or brickwork. Authentic Stone specialises in complete heritage facade repointing for substantial residential and commercial restoration projects across South Australia.

‍