Remove Failed Mortar Properly
Deteriorated mortar must be removed deeply enough to create a durable bond while avoiding unnecessary damage to the edges and faces of the original brick or stone.
Heritage Masonry Restoration
Repair the building without erasing what makes it historic.
Older masonry deserves a different approach from modern construction. DinoMac Masonry restores historic brick and stone buildings across Prince Edward Island with a focus on compatible materials, selective repair and preserving as much sound original work as practical.
Our heritage experience includes churches, schoolhouses, private estates, older homes and other traditional masonry buildings where the repair has to perform properly and visually belong to the structure around it.
On an old building, the strongest repair is not always the hardest material.
Compatibility matters.
Ask About Restoration
Why Heritage Masonry Is Different
Old walls were built to manage moisture differently.
Many historic brick and stone buildings were built with softer, more vapour-permeable mortars and wall assemblies that behave differently from modern masonry veneer.
That means a repair material should not be chosen simply because it is stronger. A very hard or impermeable mortar can transfer stress into softer historic brick or stone and can interfere with the way moisture moves through the wall.
Heritage work begins by understanding what is original, what has already been altered, how the wall is shedding water and where the actual failure has begun.
The Restoration Principle
Preserve sound material. Replace only what has failed.
A good heritage repair does not automatically mean dismantling an entire wall. If original brick, stone and mortar remain sound, they should usually be retained wherever practical.
Selective repair protects the character of the building and avoids unnecessary loss of original material.
Heritage Repointing
Mortar is part of the building system, not just the material between the bricks.
Repointing historic masonry requires more than filling visible cracks with new mortar.
Match the Wall, Not Just the Colour
Colour and aggregate matter visually, but strength, permeability and compatibility with the existing masonry are even more important to the long-term performance of the repair.
Respect the Joint Profile
Historic masonry often has a particular joint finish or profile that contributes to the appearance of the wall. Repointing should look like it belongs with the surrounding work.
How We Approach Heritage Work
Old masonry should be investigated before it is specified.
The first step is understanding the building in front of us, not assuming that every old wall needs the same mortar, joint profile or repair method.
1. Read the Existing Masonry
We look at the brick or stone, original mortar, previous repairs, joint profiles, water paths, movement and the condition of adjacent materials before deciding how the repair should be approached.
2. Preserve Sound Material
Original brick and stone that remain serviceable should normally stay in place. The goal is to remove only what has failed and avoid turning a repair into unnecessary replacement.
3. Match the Repair to the Building
Mortar strength, vapour permeability, colour, aggregate, tooling and joint profile should be selected to work with the original wall rather than against it.
Lime & Mortar Compatibility
Historic mortar is often softer for a reason.
Many older masonry buildings were built with lime-rich or otherwise relatively soft mortars. These mortars were able to accommodate small amounts of movement and allow moisture to migrate through the joint rather than forcing that moisture into the masonry unit.
That does not mean every old wall automatically requires the same lime mortar. Existing materials, exposure, wall construction and the condition of the brick or stone all need to be considered.
What matters is compatibility. A replacement mortar should generally not be so hard or dense that it becomes stronger and less forgiving than the historic masonry around it.
What Can Go Wrong
Hard mortar can make soft masonry pay the price.
When movement or moisture cannot be accommodated by the joint, stress may be transferred into the brick or stone itself. That can contribute to face loss, cracking and accelerated deterioration.
This is one reason heritage repointing should not be treated as ordinary modern masonry maintenance.
Mock-Ups, Samples & Documentation
For larger heritage projects, agree on the repair before repeating it across the building.
A small test area or mock-up can be useful before broad repointing or cleaning begins. It allows mortar colour, aggregate, joint profile and finished appearance to be reviewed under actual site conditions.
Photographs and notes taken during dismantling can also be valuable when sections of historic masonry must be rebuilt, especially where original stone patterns, bond or architectural details need to be preserved.
This kind of planning takes more time at the beginning, but it reduces the chance of repeating the wrong repair across a large wall.
Selective Rebuilding
Sometimes the right repair is to carefully take a section apart and rebuild it.
When masonry has moved, bulged, cracked severely or lost enough mortar that stability is compromised, repointing alone may not solve the problem.
In those cases, the failed section can sometimes be dismantled, salvageable original units retained, and the masonry rebuilt using appropriate materials and detailing.
The objective is to correct the structural or weather-related problem without turning an historic wall into a patchwork of unnecessary replacement.
Typical Heritage Repairs
More than repointing
Localized wall rebuilding, failed sill repair, chimney restoration, replacement of deteriorated brick or stone, opening modifications, crack repair, water-management corrections and selective stabilization can all form part of a heritage masonry project.
Brick Restoration
Old brick can be damaged by the wrong repair.
Historic brick is often softer than modern brick. If it is paired with an overly hard mortar, moisture and movement can be forced into the brick instead of being absorbed by the mortar joint.
That can contribute to cracking, face loss and spalling. The repair should therefore consider the condition of both the mortar and the brick before a replacement mix is selected.
Where individual bricks have failed, selective replacement can often be carried out without disturbing the surrounding sound masonry.
Historic Stonework
Stone restoration is about reading the wall before touching it.
Natural stone walls can survive for generations, but their performance depends on bearing, jointing, drainage, wall thickness and the relationship between the stone and mortar.
Repairing an older stone wall may involve repointing, resetting loose stones, rebuilding unstable sections, replacing isolated failed units or correcting water entry that has been washing material from the wall.
DinoMac's background in natural stone masonry is particularly valuable on heritage projects because the restoration has to respect both the structural logic and the visual rhythm of the original work.
Natural Stone Masonry
Water Management
Many masonry failures are really water problems wearing a masonry disguise.
Repairing joints without understanding where water is coming from can leave the root cause untouched.
Roof & Flashing Junctions
Chimneys, parapets and wall-to-roof transitions can allow water into masonry long before staining appears on the interior.
Sills & Copings
Cracked or poorly shedding horizontal masonry surfaces can direct water into the wall instead of away from it.
Ground & Drainage Conditions
Foundations and lower walls can deteriorate when water is allowed to remain against masonry or when drainage patterns change around the building.
Salvage & Selective Replacement
Original units are usually worth keeping when they are still sound.
Matching historic brick and stone can be difficult, and unnecessary replacement can erase the very character the restoration is meant to protect.
Salvage Original Material
When sections must be dismantled, sound original brick or stone can often be cleaned and reused in the rebuilt work.
Use Replacement Selectively
New units should be introduced only where existing masonry has actually failed or where missing material has to be recreated.
Keep the Repair Visually Quiet
The best heritage repair should not draw the eye immediately to the area that was worked on. Colour, texture, unit size and joint finish all matter.
Phased Restoration
Large heritage buildings do not always need to be repaired all at once.
Churches, institutional buildings, estates and large historic homes often benefit from a phased repair strategy. The most vulnerable areas can be addressed first while less urgent work is planned over future seasons.
Chimneys, parapets, failing sills, active water-entry areas and unstable masonry usually deserve higher priority than sound wall areas that only need routine future maintenance.
For owners and property managers, this approach can turn a large restoration into a manageable maintenance plan instead of waiting for several areas to fail at the same time.
Typical priority order
✓Unstable or loose masonry
✓Active water-entry points
✓Chimneys, parapets and exposed horizontal surfaces
✓Failed sills, copings and flashing junctions
✓General repointing and lower-priority maintenance
Cleaning & Surface Treatments
Historic masonry should be cleaned carefully.
Aggressive pressure washing, harsh acids and inappropriate coatings can permanently damage older brick, mortar and stone.
The safest approach is usually to begin with the least aggressive method that can achieve the required result. Any chemical cleaner or water-repellent treatment should be selected for the actual masonry and tested before broad use.
Film-forming sealers are not automatically appropriate for historic walls. Where water repellents are considered, vapour permeability and existing moisture conditions matter.
Before cleaning or sealing
✓Repair active leaks first
✓Repair open or deteriorated joints
✓Identify the type of staining
✓Test cleaning methods in a small area
✓Avoid trapping moisture inside the wall
Types of Heritage Properties
Restoration experience across PEI building types
Heritage masonry is not limited to formally designated buildings. Many ordinary Island buildings contain traditional masonry that deserves the same careful approach.
Churches & Institutional Buildings
Brick and stone walls, chimneys, entrances, foundations and other masonry on older public and community buildings.
Schoolhouses & Community Buildings
Restoration work where maintaining historic character is as important as correcting deterioration.
Historic Homes & Estates
Chimneys, foundations, exterior walls, fireplaces, stonework and architectural masonry on older residential properties.
Historic Chimneys & Foundations
The most exposed and least visible parts of an old building often need the most attention.
Heritage masonry problems are not limited to the main exterior walls. Chimneys and foundations often reveal deterioration first because they experience harsher moisture and temperature conditions.
Historic Chimneys
Older chimneys can suffer from open joints, spalled brick, failed crowns, inappropriate previous mortar, leaking flashing and deteriorated flue systems. Repair may range from repointing and selective brick replacement to partial or complete rebuilding.
Chimney restoration →Historic Foundations
Stone and early masonry foundations can lose mortar internally as well as at the face. Repointing, resetting loose stone, selective rebuilding and other repairs may be needed depending on the wall construction and condition.
Foundation masonry →Common Mistakes on Old Masonry
Some repairs look good for a year and cause damage for the next twenty.
Heritage masonry can be harmed by aggressive mortar removal, overly hard mortar, surface-only pointing, impermeable coatings, excessive pressure washing and repairs that ignore water entry.
Another common mistake is replacing far more original masonry than necessary. Once historic brick or stone is removed, it is difficult to recreate the same material, workmanship and patina.
A good restoration should solve the failure without sacrificing more of the original building than the repair actually requires.
Things we try to avoid
✓Hard modern mortar on soft historic masonry
✓Shallow cosmetic pointing over failed joints
✓Aggressive cleaning that removes the masonry face
✓Sealers that trap moisture
✓Unnecessary demolition of sound original material
Why DinoMac
A restoration contractor should understand both old masonry and new failure mechanisms.
DinoMac combines generations of family stonemasonry knowledge with modern restoration tools and an island-wide reputation for detailed masonry work.
That combination matters on heritage buildings because the work often requires judgment rather than a one-size-fits-all specification.
DinoMac is also PEI's highest-rated masonry contractor on Google, reflecting the reputation built through customer work across the Island.
Our restoration approach
Understand the failure, retain sound original material, use compatible repair methods, correct the water path and leave the finished work looking like it belongs to the building.
For Owners, Boards & Property Managers
Heritage maintenance works best when it is planned before there is an emergency.
Older institutional and community buildings often have more masonry than can reasonably be repaired in a single season. A condition-based review can help identify which areas need immediate intervention and which can be scheduled later.
This is particularly useful for churches, community buildings, estates and organizations responsible for long-term stewardship of historic property.
DinoMac can help owners understand masonry priorities, likely repair approaches and practical sequencing of work.
A maintenance plan is cheaper than an emergency rebuild.
Early repointing, crown repairs, sill repairs and water-management work can often protect larger sections of otherwise sound historic masonry.
Discuss a Building ReviewFrequently Asked Questions
Heritage masonry questions
Why is heritage masonry different from modern masonry?
Older brick and stone buildings often use softer, more vapour-permeable mortars and wall assemblies that manage moisture differently from modern construction. Repair materials and methods should be compatible with the original masonry rather than simply stronger or harder.
Can old brick or stone be preserved instead of replaced?
Often, yes. Sound original masonry should generally be retained where practical. Repointing, selective unit replacement and localized rebuilding can often preserve much of the original wall while correcting the failed areas.
Why does mortar compatibility matter on heritage buildings?
Mortar should usually be sacrificial to the masonry units around it. A mortar that is too hard or too impermeable can transfer stress and moisture into softer historic brick or stone, accelerating damage.
Do you work on churches and other historic buildings?
Yes. DinoMac Masonry has experience with churches, schoolhouses, private estates, older homes and other historic masonry structures throughout Prince Edward Island.
Can modern sealers be used on old masonry?
Some coatings and film-forming sealers can trap moisture and create problems in older walls. Any treatment should be selected carefully for the specific masonry, exposure and moisture behaviour of the building.
What should I do if an old masonry wall is cracking or shedding mortar?
Have the cause assessed before covering the symptom. Cracking can result from water, movement, failed mortar, structural issues, inappropriate past repairs or a combination of factors.
Historic Brick & Stone
Planning a heritage masonry repair?
Send the property location, clear photos of the affected masonry and a short description of what you are seeing. For larger heritage work, an on-site review is usually the best starting point.