Questions homeowners actually ask

People are often told that stronger is better, and on a modern block wall that is true. An old wall is the opposite. It needs to breathe and move a little, and the soft lime joints are what let it. Modern cement is too hard for historic brick. It will not give, and it traps the moisture that used to escape through the joints, so that water works on the brick instead and freezes the face off it.

This one matters because it is often the exact moment a homeowner has a quote in hand. A modern mason reaches for a modern mortar out of habit, not bad faith. But the real test is not what is strongest, it is what is compatible with the brick beside it. Softer and breathable protects the wall. Harder and sealed works against it. The one exception is a full rebuild in new, harder brick, say a stand-alone chimney matched to the original, where a harder mortar like Type N suits the new brick. On your existing soft old wall, though, it does not belong.

Moisture comes into every old wall. In a healthy wall it breathes back out through soft joints. Seal those joints with hard cement and the water has only one way out, through the brick. Through a hundred freeze-thaw cycles a winter, it freezes inside the brick and blows the face off, one brick after another.

A lot of our calls come from homeowners whose brick started failing after a well-meaning repair in modern cement. The good news is it can usually be undone. After the relief cut and the chisel work, if the Portland runs deep we have two choices. Sometimes we take out that panel and rebuild it. If the hard cement is too extensive across the wall to lift it all, we drill through it to open up passages, so the soft lime we repoint with can still do its job and let the wall breathe. Then the whole area is repointed in a breathable lime. Done right, you would never know the cement was there.

Cleaning is worth doing only when the wall actually needs it, and then with the softest method that works. On the right job that means a gentle detergent, a little agitation, a little time, and as little water as possible, tested on a small area first.

In the hot months, or when the mortar has to be tinted to blend into the original brick, I often reach for a Pozzolanic Hydraulic Lime, or PHL, instead of NHL. PHL is a lime blended with a natural additive that gives it its set, and it tints more evenly and handles heat better. It breathes and stays soft just like NHL, with no Portland cement in it. A mason who only ever reaches for one mortar is not really matching your wall. Matching means choosing the lime, the sand, and the colour to suit this house and the season we are working in. As a rule we use a 3.5 grade on brick and a 5.0 on stone, then pick the exact lime, NHL or PHL, for the season and the colour work.

A chimney takes weather on every side, so whatever goes up there has to breathe and shed water. With your original or reclaimed brick, that means lime, and in the hot months I reach for PHL because it tints more evenly and handles the heat. With new matching brick, the whole assembly is harder and more uniform, and Type N suits it, because Type N is still softer than that new brick. The only real mistake is a mismatch: hard Type N packed against soft old brick, which traps moisture and pops the face off. Get the pairing right and the chimney outlasts all of us.

Matching is its own craft. It can take several passes of different tints and methods to get new work to disappear into a hundred-and-fifty-year-old wall. On the right job you would have a hard time finding where we worked.

Most hardware-store sealers work like a coat of plastic over your house. They might keep some rain off for a season, but they also trap the dampness rising from the ground and the moisture trying to escape from inside the home. When that trapped water hits the back of the sealed face in an Ontario winter, it freezes, expands, and pops the brick face off. That is spalling, the same failure hard cement causes, just coming from the other direction. If your wall has a moisture problem, the answer is never a coating on top. Find the water first, a leaking eavestrough, a downspout, or a bad flashing, then repoint the eroded joints with a breathable lime mortar so the wall can dry the way it was built to. The one place I have actually used a sealer is narrow and different: on an irreplaceable feature piece, a coping or a buttress that is delaminating or spalling but cannot just be swapped out, where a breathable hydromorphic impregnator can buy it time. It is not permanent, it lines the pores rather than sealing the surface, and it has to be reapplied every few years. There may also be a case for it on brick already ruined by old sandblasting, but I will be honest, that is a theory I am still weighing, not a promise.

The good news is that this can usually be put right. The old coating has to come off with a method gentle enough not to scar the brick, the water source found and fixed, and the wall repointed with a breathable lime mortar so it can finally dry out. The longer a sealed wall sits through freeze-thaw, the more brick face you lose, so it is worth looking at before another winter.

The method depends on the kind of sealer. A film-forming coating, the shiny or milky kind that sits on top, is softened with a heritage paste stripper, left to work, then lifted off by hand and rinsed with gentle, low-pressure warm water. A penetrating repellent that soaked into the brick is harder, because it has bonded inside the pores, and it takes a specialized solvent to break it back down. Either way, the first step is always a test patch on an out-of-the-way area, to make sure the chemical lifts the sealer without harming the brick or the mortar, and to work out how long it can safely sit. Rushing a whole wall without that test is how brick gets wrecked.

When mortar goes to sand, the wall is quietly losing what holds it together. Sometimes stones above start to shift because the joints below can no longer carry them. This is repointing work, and if stones have already loosened, some may need to be reset first.

Spalling is a warning sign, not a cosmetic one. It is usually failing gutters, water sitting against the wall, or a past repair in hard Portland cement that trapped the moisture inside instead of letting it breathe out. The fix is to find the water first, then carefully take out the blown bricks and set matched reclaimed brick in a soft, breathable lime mortar, so the repair lasts instead of failing again in a few winters. If there is a white powder coming off with it, check the "white stuff" question, because that points to where the water is.

Caught early, this is usually a handful of bricks swapped out and the water source fixed. Left alone, the same water keeps working outward through more brick and into the joints, and a small job turns into a big one. This is one of those problems where the cheapest time to deal with it is now.

These homes were built as breathing systems, drying from both sides. Insulation and modern heating are good for your comfort and your bills, but they quietly cut off the wall's inside drying path. Now every bit of moisture has to leave through the outside face alone. If the joints are sound and breathable, the wall copes. If they are sealed with hard cement, or the brick is holding extra water from a gutter or a coating, the wall has no way to dry, and the faces start popping off, sometimes within a winter or two of the upgrade.

Three things save a wall in this spot. First, the mortar has to do all the drying now, so the joints get repointed in a breathable NHL or PHL 3.5, chosen for the wall and the season. Second, every bit of trapped-moisture chemistry has to come out, any Portland patches raked out and any acrylic coatings chemically stripped, so the whole face can breathe again. Third, your margin for error is gone, so the outside has to stay bone dry: downspouts carried well clear of the wall, flashings sound, nothing splashing or pooling against the brick. A breathing wall could forgive a leaky gutter. An insulated one cannot. And if you have not insulated yet but plan to, get proper building-science advice first, so the interior side is done in a way that still lets the wall dry.

Cracks are the wall telling a story. I have seen a column go two inches out of plumb in one winter from a single redirected downspout, and a wall come down in the night. If a crack is new, growing, or the wall is bulging, do not sit on it.

Here is what tells me a wall is still working, not just cracked. First, misalignment: if the brick heights on either side of a crack no longer line up, the wall has physically moved. Second, the direction of the crack. A long horizontal crack can mean the wall is being pushed from outside. Cracks spreading above or to the sides of an arch or an opening mean the load is shifting around it. A wall that bulges or bellies out has usually lost the ties holding its face to the structure behind it, and that face can come down under its own weight. Doors or windows that suddenly stick, lined up with the cracks, point to the foundation dropping. If you see any of those, do not wait and watch it get worse. Often a mason is the right person to read a crack. But when the movement has gone beyond the masonry itself, a structural engineer should be involved. The signs I watch for are flashing pulling apart above a cracking area, wood joinery separating as the masonry moves, or a crack running down into the foundation where the two panels on either side have clearly shifted. Any of those, and the wall wants an engineer's eye, not just mine. What it does not need is fresh mortar smeared over a moving crack, which only hides the problem.

Two simple checks I set homeowners up with. First, look inside the crack. If the edges of the brick and mortar are clean, sharp and bright, it is recent and probably still moving. If the inside is full of old dirt, cobwebs or paint, it likely settled long ago. Second, the one I most often recommend: run a small line of caulking across a section of the crack and note the date. Then check it the following season. If the caulk has pulled apart or split, or the crack has opened past it, the wall is still moving. If it held through a full swing of hot and cold, the wall has likely settled. A crack that opens with the heat or cold and then closes again is usually just the wall breathing with the temperature. One that keeps opening and never comes back is still on the move, and that is worth a call.

A chimney takes weather on every side, and the flue keeps the inside damp, so it is the hardest-working masonry on the whole house. When the brick or the crown has gone, the honest fix is usually a rebuild from the roofline up, not a skim over the outside. The cap and the brick also expand and contract at different rates, so that joint opens up and lets water in, which is why it needs looking at more often than the rest of the wall.

There are really three different things people lump together as "efflorescence," and they are not equally serious.

Lime run-off: water gets deep into the wall, dissolves the lime inside the old mortar, and carries it to the surface, where it hardens back into stone. It shows up as hard white drips or streaks you cannot wipe off, and it points to concentrated water entry above, a leaking gutter, a failed flashing, or a cracked sill.

Subflorescence: the salt crystallizes just under the skin of the brick instead of on top. The pressure blisters and pops the face off in thin wafers, leaving a powdery layer behind. This usually means a sealer or hard Portland cement has trapped moisture inside a soft brick.

Leached cement salts: when water is trapped behind hard modern mortar, it pulls chemicals out of the Portland cement and leaves a tough grey-white crust spreading out from the joints. It is a sign the wall was repointed with the wrong material.

I was once called to a home where a downspout had been redirected, just slightly wrong, over a single winter. That water got into the base of a stone column and froze and thawed about a hundred times. By spring the column had leaned a full two inches and two and a half tons of stone had come down in the night. The repair was over twenty thousand dollars. The thing that would have prevented it cost a few dollars, sealing the eavestrough and pointing the downspout away from the wall. So check your downspouts. Check your eavestroughs. If water is running down or pooling against your brick, that is the cheapest problem you will ever fix, and the most expensive one to ignore.

A modern basement is sealed to stay bone dry. An old one is not, and trying to force it to behave like one is where people get into trouble. The goal is to manage the moisture, not to wall it in. Get the water away from the outside of the foundation, let the wall breathe on the inside, and a lot of chronic damp settles down on its own.

The water has to go somewhere. Seal the inside face and it builds up in the core of the wall, dissolves the soft lime mortar, and flakes the masonry apart from behind the paint. A heritage foundation is meant to breathe its moisture into the basement air, where a dehumidifier can carry it away. The fix is drainage and breathability, not a coating that hides the problem while it gets worse.

The order matters. We start outside. There is no magic distance for a downspout. What matters is that the ground slopes to carry surface water away from the house and away from the masonry, not toward it. Then any modern Portland patches or waterproof coatings that are trapping water get carefully removed. Only then do we clean out the sandy, washed-out joints and repoint. A foundation is not repointed with the same soft lime as the brickwork higher up. The stone and the loads down there call for a stronger mix, usually an NHL or PHL 5.0, still fully breathable, just stronger. It is a system, not a patch, and the right mortar changes as you move up the wall.

A modern crew can grind and gun a wall in a fraction of the time, but that speed is exactly what destroys an old wall. Hand work protects the brick edges, the right mortar protects the wall for generations, and safe access is real work in itself. You are paying for the wall to still be standing in fifty years.

Here are the exact questions to ask, and the answers you want. "Will you use an angle grinder on the vertical joints?" The answer should be no. On the vertical joints a grinder scores the brick above and below and cannot reach a clean depth. "What type of mortar will you mix?" If they say Type N, Type S, or regular Portland, that is modern cement, too hard for old brick. "How will you clean it?" Anything with sandblasting or high pressure strips the fired skin off the brick and it fails within a few years. A good heritage mason passes all three without blinking.

There is a place for a power tool, but a narrow one. On the horizontal bed joints we can make a controlled relief cut down the centre of the joint to take the pressure off, then clean out to the edge of the brick, the arris, by hand. We do not put a grinder on the vertical joints at all. They are too hard to control, they score the brick above and below, and you cannot reach a clean depth. For those relief cuts we most often use an Arbortech saw, then finish with sharp, precise chisels so the face and edges of the brick are never touched. We also stay away from pneumatic chippers that strike and vibrate the masonry, which heritage architects rightly frown on. The one exception is very large stone joints, the kind you find in rubble stonework, where a small variable-speed chipper can safely make the first opening.

On one job we took out bricks at strategic points across an elevation and re-pinned the outer face back to the inner wall, all during a normal repointing, without a full rebuild. Catching it at that stage is far cheaper than waiting until the wall has to come down.

Here is what goes into a repair you cannot see.

The mortar colour. The base comes from the mix itself, the aggregate size and the sand, and sand from different regions reads differently in the joint. But there is one thing sand cannot give you: the century of aging every old mortar has been through. We could be purists, match the original mix exactly, and wait a hundred years for it to blend in. Instead we add subtle tints to age the mortar and match the original colours used on heritage homes in our region, so a fresh joint looks like it has always been there.

The brick. A brand-new brick from the store is too uniform and too bright for a century wall. An exact reclaimed match with the same patina is always the best option and the most satisfying, but good matches in the condition an expensive restoration deserves are hard to find. So when an exact match is not possible, we do something better than a compromise: we harvest your own original brick from a hidden area of the house and move it to the prominent elevation or feature, then fill the hidden area with new brick matched in density and size, tinted to blend. Your best face keeps its real, original brick.

The joint profile. The mortar is shaped with a tool, and old walls have a particular joint, flush, concave, beaded or weather-struck. We match the original tooling rather than leaving whatever a trowel happens to do, because the wrong joint shape reads as new even when the colour is perfect.

The proof before we commit. On a prominent wall we do a small sample panel first, in an out-of-the-way spot, and let it fully cure so you can see the real, settled colour and texture and approve it before the main work starts. No guessing on the front of your house.

The bright white smear you see around the neighbourhood is modern mortar, too hard and the wrong colour, often with store-bought brick stuck in. We take that failed repair out by hand, protecting the original brick, then redo it with matched brick, matched mortar, and the right joint, tested on a panel first. The goal is that the eye passes right over the spot that used to shout at you.

Both masons can be honest and skilled. The difference is strategy. A quick patch gets the chimney through more seasons, and plenty of homes genuinely need exactly that. But on a chimney going from the inside out, the more responsible plan is to deal with the actual cause, even when that is a bigger number. My job is to show you which of the two you are really looking at, so you choose with the full picture and not just the lowest price.

Lime mortar cures by carbonation, a slow chemical set that needs warmth and moisture, not the quick dry of modern cement. My rule is that the fresh work cannot freeze while it cures, and I keep the wall damp and covered in burlap, what some call hessian, for at least three days and up to seven, depending on the temperature and the wind. The point is to let the mortar cure, not dry out and "flash." Hot, dry summer days carry their own risk, because a sun-baked brick pulls the moisture straight out of the mortar and cracks it, so on those we pre-wet the brick and shade the wall. It is less about the calendar and more about giving the lime the conditions it needs.

This is the big difference between heritage work and modern masonry. A modern crew can add an anti-freeze to Portland cement and lay it in the cold. You cannot do that with lime, and anyone who tries is setting your wall up to fail. Lime needs warmth and time to carbonate. Freeze it early and you have paid for a repair that quietly destroys itself over one winter.

On a large home with several phases of work, we isolate one elevation or section inside an insulated, wind-resistant tarp enclosure. We tap into the property's own natural gas and run safe furnaces day and night, with thermostats hung right by the wall to hold the temperature steady while the lime cures. On these bigger projects the tarps usually go up in the fall and come down in the spring, so the work carries straight through the winter. It means an estate project does not have to stop from November to May, and you are not fighting the spring booking rush to get started. It is not how we handle a small single repair, that one waits for the warm season, but for substantial multi-phase work it keeps everything moving.

This is why a lot of Ontario homeowners are getting notices from their townships right now, as staff work through their registers before the deadline. Being "listed" and being "designated" are two different things. Listed means the municipality has flagged the property as having heritage interest. Designated is the formal, protected status, and it is designation that opens the door to municipal grants and tax relief. If your property is only listed and you want to keep its heritage standing and that access to funding, this is the window to sort it out with your municipal heritage planner. My part is the masonry side: if your property is heading toward designation, or you want restoration done to the standard that protects its heritage value, I work to the national Standards and alongside the planners so the brick and stone work supports the case rather than undermining it. For your property's exact status, your municipal heritage planner is the first call.

The line to keep in mind is repair versus alteration. Fixing failing brick, repointing, rebuilding a chimney the way it was, that is restoration, and it generally does not need a permit. Adding to the building, or changing a heritage feature, is an alteration, and that is where approvals come in. Grant programs are a separate matter again, and they are stricter, because the funding is tied to the work meeting the conservation standards. Since designation rules do vary by municipality, the safest first step for your specific property is a quick call to your local heritage planner to confirm what your case needs. My part is making sure the masonry work itself is done to the standard those approvals and grants require.

In practice on an Ontario heritage wall, that means soft, breathable lime rather than hard Portland cement, mortar that is weaker than the brick, joints matched to the original in colour, texture and profile, and brick matched or reused rather than swapped for bright modern units. It means no sandblasting and no pressure washing. And it means finding and fixing the water before repairing the wall. Those are not my personal preferences, they are the recognized standard, which is exactly why they hold up with municipal reviewers and grant programs. One more thing worth knowing: the national document is the backbone, but each region also publishes its own heritage values, and they may weight one part of the work more than another. Before you fill out a grant application, it pays to learn the exact language that grant body uses. The differences look subtle, but they are not subtle at all to the person appraising your application, and knowing that is part of what I bring to a proposal.

Here is the part worth understanding, because it works in your favour. Committees do not just set requirements, many of them help offset the cost of a proper restoration on a valuable heritage property, through grants and funding, precisely to encourage and make possible the correct methods and materials. The strings attached to the money are the same standards a good restoration follows anyway: soft, breathable lime, matched brick, the right joint, repair over replacement. The requirement and the funding are two sides of the same deal. My job is to give you work that meets it cleanly, and a proposal a committee can approve without hesitation.

Every program has its own rules, but they share one thing: the work has to meet the national conservation Standards, the same ones this site is built on. If a contractor uses Portland cement or grinds out the joints, the municipal inspector can reject the work and the funding is denied. The mortar and the method matter as much as the price.

Toronto — Heritage Grant Program, up to 50% of eligible conservation work on designated homes: Toronto Heritage Grant Program. Larger properties may prefer the Heritage Tax Rebate.

Peterborough — 40% property tax relief for designated homes, plus a Heritage Conservation District grant of 50% up to $5,000: Peterborough Grants and Incentives.

Port Perry and Scugog — Downtown Heritage Conservation District Grant, up to 50% to a maximum of $10,000 per property: Scugog HCD Grant Program.

Lindsay, Bobcaygeon and Kawartha Lakes — heritage-designated homes can tap the city's Million Dollar Makeover funding, with Lindsay, Bobcaygeon, Fenelon Falls and several other villages named as priority focus areas: Kawartha Lakes Million Dollar Makeover. For community and public buildings in Bobcaygeon, such as churches and halls, there is also the Bobcaygeon Legacy C.H.E.S.T. Fund: Bobcaygeon C.H.E.S.T. Fund.

For other Durham-area or nearby municipalities, Ontario's own overview of municipal heritage grants is the place to start: Ontario municipal heritage grants.

Important: almost every program requires approval before any work begins, and many ask for two detailed quotes from heritage specialists. Work started before approval is usually disqualified. So the first move is a conversation, not a shovel.