Residential Roof Waterproofing & Coating
Not every part of a house is protected by shingles. Flat garage roofs, kitchen additions, balcony decks, and low-slope dormers may be unsuitable for standard shingles, and those areas need systems suited to their slope and use. Markit Roofing handles residential roof waterproofing on these sections across Calgary and Edmonton with fluid-applied coatings and sheet membrane systems.
Where shingles rely on gravity, a low-slope surface needs a waterproof system with carefully sealed details. We coat and seal the parts of your home standard roofing cannot, restoring suitable existing surfaces where their condition allows. If your main sloped roof needs work instead, that is a residential roof replacement. Book your waterproofing assessment today.
The Flat Areas That Let Water Into Your Home
The trouble spots are always the same: the places where a flat or nearly flat surface meets the rest of the house. Water that would run straight off a steep roof instead sits and works its way in wherever the pitch drops below what shingles need to drain. These are the parts of an Alberta home our residential roof waterproofing is most often called to.
- Flat garage and shed roofs
- Additions and extensions
- Balconies and deck surfaces
- Low-slope dormers and bays
- Over-porch and bay roofs
Some of these areas have slopes unsuitable for shingles, while others leak because of damaged materials or details. A coating or membrane turns that slow-draining surface into a sealed, watertight one. We assess which system suits each area because a balcony that handles foot traffic needs a different build from a garage roof that only handles weather.
Our Home Waterproofing Process
Check and Test the Surface
The first visit is about whether the surface is even a candidate. We probe the deck for soft spots and concealed rot, run an adhesion test on the existing finish, and read the moisture level, since a fluid system seals in whatever it covers, so unsuitable or wet substrates need attention first.
This matters more on a home than owners expect. If a garage deck is already saturated, a residential roof inspection can investigate signs of trapped moisture, because coating over trapped water only rots the wood from below. Where we find that, we deal with the wet deck first rather than sealing the damage out of sight.
Prepare and Prime the Deck
Everything rests on the substrate underneath, so the prep stage carries most of the labor. We scrub the area back to sound material, lifting off dirt, chalk, moss, and anything loose or already failed, then leave it to dry right through. A weathered or bare deck gets a primer coat so the system keys in for good.
Preparation is also where corners get cut, and poor preparation can cause a coating to fail early. We do not rush it. A properly cleaned, dry, and primed surface allows a fluid-applied system to bond as a single continuous film rather than lifting at the edges during the first winter.
Reinforce the Weak Details
A coating or membrane gives way at the details long before the open field does, so every weak point is reinforced ahead of the main surface. Seams, edges, drains, and penetrations are bedded into reinforcing fabric and a detailing coat, since those transitions carry the most movement and water probes them first.
On a house that means close work at the wall junctions, at the flashing where a flat run meets the sloped roof above it, and around any railing post punched through a balcony deck. Handle those transitions first to reduce the risk of leaks at these vulnerable points.
Apply the Seamless Coating
Once the detailing has cured, the field coat or membrane is applied across the entire area to the thickness specified by the manufacturer. Fluid products are laid in measured passes, and we gauge the wet-film depth on each pass so the finished skin builds to full strength rather than ending up starved and thin.
We work to the temperature and cure windows the product needs, which in Alberta often means watching overnight lows as closely as daytime highs. Once cured, a fluid-applied coating forms a continuous surface. Sheet membranes need sealed seams, and every system depends on sound detailing and drainage.
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Waterproofing Systems We Apply on Alberta Homes
Liquid rubber and acrylic coatings are the versatile choice for flat and low-slope home sections. Laid on far thicker than any paint, they flex and spring back with the surface as it heats and cools day to day, spanning fine cracks and closing the area off to water. Reflective acrylic coatings can help reduce roof-surface heat in sunny conditions, and both go straight onto a sound existing surface. We use them on garage roofs, additions, and porch roofs where a seamless, renewable barrier is needed to keep the area dry through Alberta’s swings.
EPDM is a synthetic rubber membrane used on flat and low-slope roofs, and it suits the low-slope sections of a home well. Supplied in large sheets, it is laid to minimize seams and bonds into a continuous, flexible barrier designed for changing temperatures when properly selected, detailed, and installed. It is an excellent fit for a detached garage, a flat-roofed addition, or a carport, where its long service life and low upkeep make it a dependable, value-driven choice that keeps water out year after year.
Silicone coatings earn their place wherever water tends to pool, which on a home means the low garage roof or the addition where drainage was never right. Some silicone systems tolerate ponding water, but suitability depends on the specific product and existing roof. Drainage issues still need assessment rather than relying on coating alone. Recoat timing depends on the product, application thickness, roof condition, and maintenance. The one trade-off is that it gets slippery when wet and holds dirt, so surfaces used for foot traffic need a manufacturer-approved walking system, rather than an assumption that grit makes any coating suitable.
A balcony or deck is a roof over whatever sits below it, and it takes foot traffic as well as weather, which is why it needs a purpose-built system rather than a plain coat. We lay a tough, walkable membrane detailed around railing posts, thresholds, and drains, the exact points where deck waterproofing tends to fail. When done properly, the surface stays watertight and comfortable underfoot, protecting the living space, entryway, or storage below it from the slow, hidden water damage that a leaking deck can cause.
Why Our Waterproofing Lasts on Alberta Homes
Residential roof waterproofing is a distinct trade, separate from shingle work, and it is where many general roofers come unstuck. Markit Roofing applies fluid and membrane systems to the parts of your Calgary or Edmonton home that shingles cannot protect, and we treat those small areas to the same standard as a full roof, because a leaking garage or balcony damages the living space below just as surely.
Applied to Suit the Surface
Product selection needs to account for the existing roof, drainage, and how the surface is used. Coatings differ in their tolerance of standing water, and walkable areas need a system designed for foot traffic. We assess those conditions before choosing a coating or membrane, following the selected manufacturer’s requirements for preparation and application.
Restoration for Suitable Roofs
A suitable existing roof may be restored without a full tear-off, reducing disruption and material removal. That depends on the deck’s condition, moisture levels, and compatibility with the proposed system. Wet, damaged, or unsuitable material needs attention before coating. Our assessment helps establish whether restoration is appropriate or whether repairs or replacement are needed first.
Seamless Watertight Finish
Fluid-applied coatings cure into a continuous film across a suitable, prepared surface. Careful detailing around corners, drains, and penetrations remains essential because these areas must handle movement and water flow. Sheet membranes use sealed laps instead. Either approach depends on the right materials, sound preparation, and installation that follows the selected system’s requirements.
Built for Alberta Freeze-Thaw
Alberta is punishing on any flat surface, so we select and apply every system for the local reality: deep freeze-thaw cycling, heavy UV, and water that pools and then freezes. Our residential roof waterproofing puts a membrane where a garage roof takes a beating, silicone where a low-lying pond forms, and reflective acrylic where summer heat is the enemy. Matching the system to real conditions is why our work holds up where a generic coating would crack or lift.
Manufacturer-Backed Systems
Manufacturer warranty requirements vary by product and system. Specified preparation, application thickness, installer qualifications, and registration may all affect eligibility. We follow the selected system’s installation requirements and record the application details. Review the written warranty for its coverage, exclusions, and maintenance obligations; the installation record supports that review but does not guarantee a claim will be accepted.
