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    Residential Roof Waterproofing & Coating Services

    Residential roof waterproofing is worth doing on some homes and a poor use of money on others, and the difference comes down to what kind of roof you have.

    Markit Roofing applies waterproofing and coating systems for homeowners in Calgary and Edmonton, but we start by telling you plainly whether your roof is even a candidate. Most Alberta houses are steep-slope asphalt shingle, and shingles are generally not a surface we recommend coating. Where the value genuinely sits is on the flat and low-slope parts of a home: a garage roof, a rear addition, a dormer, a balcony deck, a porch. Those areas hold water rather than shed it; they age faster than the rest of the roof, and a properly applied coating there can add real years.

    We assess the specific area, tell you what it needs, and only quote a coating when it will actually perform. That assessment is free, and it comes with a straight verdict, including the verdict that your roof does not need this service at all. Homeowners here are regularly sold coating on surfaces it cannot help, so we would rather spend an hour on your roof and send you away with an honest answer than take a job that will disappoint you in two seasons.

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    residential roof waterproofing

    Where Coating Belongs on a House

    Almost every home in Calgary and Edmonton mixes two roof types. The main steep-slope section sheds water quickly and is designed to be replaced rather than coated. Attached flat sections behave nothing like it. Water sits on them after every rain and every thaw, seams and flashings take the brunt of it, and they are usually the first part of the house to leak. That is where waterproofing earns its cost. Understanding this split is what stops you from paying to coat a surface that never needed it, and it is the first thing we walk you through when we arrive at the house.
     
    Home Areas We Actually Coat:
     
    The areas below are where residential coating consistently makes sense on Alberta homes.
    • Attached and detached garage roofs, usually flat or barely sloped
    • Rear or side additions built with a low-slope deck
    • Second-storey balconies and walkout deck surfaces over living space.
    • Porch, carport, and bay window roofs where water pools at the wall junction
    • Dormer cheeks and small flat sections tucked between pitched runs.
    Every one of these shares the same problem: standing water and a junction where the flat surface meets a wall or a pitched roof. That junction is almost always the failure point, not the middle of the field. When we coat one of these areas, we spend a disproportionate amount of the work on the perimeter, the wall flashing, and the drain or scupper, because sealing the easy-open surface while skimping on the edges is the single most common reason these coatings begin leaking again within two seasons.

    Our Process

    residential roof waterproofing

    Confirming the Roof Is Worth Coating

    We start on the roof itself, checking the surface, the substrate underneath, and the moisture already trapped in it. A coating seals a surface. It does not dry one out. If we find soft decking, wet insulation, or a leak that has been running long enough to soak the structure, coating over it traps the moisture and accelerates the rot you cannot see.
     
    In that case, we tell you the area needs to be opened up and rebuilt, and we will say so even though it means a smaller job for us. If the substrate is dry and stable, we confirm what it is made of, because the material dictates which coating chemistry will bond to it and which will peel off in the first hard winter. You get that verdict before any quote is written, so the decision to proceed is yours, and it is an informed one.
    residential roof waterproofing

    Checking Your Shingle Warranty First

    If any part of the work touches your steep-slope shingle roof, we check the manufacturer warranty before anything else. Most asphalt shingle warranties are voided outright by applying a coating over the shingles, and homeowners are frequently sold that exact service by companies that do not mention it. Losing manufacturer coverage on a roof with fifteen years left on it costs far more than any coating saves.

    We look up what your shingles are and what the warranty says, then explain the consequence in plain terms. Where a flat section is genuinely separate from the shingle field, this is not an issue, and we will show you exactly where that boundary sits on your own roof. Protecting coverage you have already paid for is part of the job, and it costs nothing to check before the work starts.
    residential roof waterproofing

    Preparing and Detailing the Surface

    Preparation on a residential flat section is close work rather than broad work. We clear the surface, cut out failed sealant at the wall junction, and repair the flashing, blisters, and open seams before any coating is opened. Any area that has been patched with roofing tar in the past gets special attention, because most coatings will not bond over it and it usually has to come off.
     
    We then prime where the substrate demands it. On a small area, the whole job is edges, penetrations, and transitions, so the detailing consumes most of the labour and it is the part that decides whether the surface holds up. None of this work is visible once the finish coat is on, which is exactly why it is the stage most often rushed. We treat it as the job rather than the setup for the job.
    residential roof waterproofing

    Applying in the Right Alberta Weather

    Coatings need a temperature window and a dry cure to bond, which in Alberta means a working season running roughly from late spring through early autumn. Applying in the shoulder months risks a coating that never fully cures, and a cold night landing on an uncured surface will ruin the bond regardless of how well the surface was prepared. We watch the forecast for a clear multi-day window before scheduling, and we will move a booking rather than apply into weather that will compromise it.
     
    On the day we apply to the manufacturer’s specified thickness, we reinforce seams and penetrations with fabric where the system calls for it, then let it cure fully before the area is walked on or loaded. If that means asking you to keep off a balcony for a few extra days, we will tell you at booking rather than on the day.

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    Why Homeowners Trust Markit With This Work

    Coating is an easy sell to a homeowner who is worried about a leak, and that is precisely why it gets sold on roofs it cannot help. We do the opposite. If your problem is a failed flashing, we quote the flashing. If your garage deck is soaked through, we tell you it needs rebuilding. Turning down work we could easily have taken is not good short-term business, but it is the reason our customers call us back and send us to their neighbours. When we do recommend a coating, you can be confident it is because the roof will benefit, not because it was the service we happened to want to sell that week. That is a standard we hold to on every visit, including the ones where it costs us the contract.
    A garage roof or a balcony deck is a small job, and small jobs are where corners get cut across this industry. Crews rush them, treat them as filler between larger contracts, and the detailing suffers. We schedule residential coating work with the same crew discipline and the same site protection we bring to a full replacement. Your landscaping is covered, your driveway is kept clear, the work area is left clean, and the job gets the hours it actually needs rather than being squeezed into the end of someone else’s day. The size of the contract does not change the standard of the work, and a homeowner who watched us look after a garage deck properly is the one who calls us when the main roof finally needs replacing.
    Coating is often pitched to homeowners as a cheap alternative without any explanation of what drives the price. We break the quote down so you can see it: the area, the condition of the substrate, the repairs needed before coating, the system selected, and the number of coats. Suppose the prep work is going to cost more than the coating itself, which on a neglected surface it sometimes does; you hear that upfront rather than discovering it as a change order midway through. You also hear how many years the system should realistically give you, so you can weigh the spend against simply rebuilding the section properly and decide with the full picture in front of you rather than a single headline number.
    We work on houses in Calgary and Edmonton every week, and we know how these specific roofs behave. We know which subdivisions were built with garage decks that were undersized from the start, how ice damming at a flat-to-pitched junction damages a coating from underneath, and how many freeze and thaw swings a surface here takes in a single season. Hail is a factor as well, and we will tell you honestly how a given coating stands up to it. That accumulated local knowledge shapes which system we put on your roof and how we detail it far more than any product brochure does. Knowing how a surface fails here is what tells us how to stop it failing on your house, and that is something no supplier data sheet can supply.

    What to Weigh Before You Book Coating Work

    The points below cover what actually determines whether coating is the right spend for a home, and they come up in nearly every residential assessment we do. Reading them beforehand puts you in a position to judge a quote on its merits rather than take it on trust, whether that quote comes from another contractor working in the area. We would far rather you understood the trade-offs properly and chose to spend your money elsewhere than sign a job you were never sold honestly, because a homeowner who knows what they are buying is the one who ends up satisfied with it.

    Coating Over Asphalt Shingles

    TPO Roofing
    Shingles shed water through overlap, so sealing them into a continuous film traps moisture in the deck below rather than keeping it out. It also voids nearly every manufacturer’s warranty still in effect on the roof. Shingle coating is sold across the industry as a lifespan extension, and it is one of the few services we will decline outright. On a shingle roof nearing the end of its service life, replacement is the honest answer rather than applying a film over a surface that has already done the work it was built to do.

    Coating Is Not a Leak Repair

    A leak means water is already tracking through the assembly, and a coating applied over the top seals it in rather than out. The correct order is to locate the source, repair it, let the area dry, and coat only if the surface warrants it. Anyone offering to coat straight over an active leak is selling a delay rather than a fix, and the damage carries on quietly underneath the new surface while you are left believing the problem was solved and the money was well spent.

    Realistic Service Life on a Home

    A residential coating gives several years before it needs renewing, with the range set by the system chosen, the thickness applied, and how much water sits on the surface between rains. Silicone holds up best where ponding is constant. The genuine advantage is that renewal means a fresh topcoat rather than a tear-off, so the second cycle costs considerably less than the first. We give you the expected window for your specific surface at the quote stage, rather than a best-case figure lifted from a brochure.

    Coating Cost Against Rebuilding

    Coating is usually cheaper than rebuilding a section, but not always, and the deciding factor is how much preparation the surface needs first. On a sound deck with minor wear, the value is obvious. On a surface carrying wet insulation and rotted sheathing, the repairs required before any coating can go down approach the cost of rebuilding it properly, and rebuilding then returns a far longer service life for the money. We put both numbers in front of you whenever that call is close.

    Keeping a Coated Surface Working

    A coating needs very little maintenance, but it does need some. Keep the surface clear of leaves and debris so water can reach the drain, check the perimeter and any penetrations once a year, and address a small split or lifted edge before winter rather than after. A coating that is kept clear and inspected reaches its full service life. One buried under wet debris with a blocked drain rarely gets close to it, and the substrate underneath ends up suffering for the neglect as well.
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