Emergency Roof Repair in Thornhill
Water coming into a Thornhill house tonight? We answer 24/7, typically reach you within 60 minutes, and come with tarps, temporary membrane, and what we need to trace the entry point on the same visit.

Emergency Roof Repair in Thornhill, what we fix.
Flooding response
Storm & wind damage
Fire-related roof & building repairs
Insurance claim support
Temporary protection & tarping
Structural drying coordination
Why you should call us first.
60-min response
Contain then diagnose
Document before covering
One call, both phases
24/7 availability
Insurance claim support
60-min response
We maintain dispatch capability across the GTA. Active leaks get priority dispatch, around the clock.
Contain then diagnose
We contain the water intrusion first, then diagnose the full failure mode. Speed and accuracy, not just one or the other.
Document before covering
We photograph and document all storm damage before applying temporary protection. That documentation matters for insurance claims.
One call, both phases
Our vehicles are stocked for both temporary containment and permanent repair. Many emergency calls end with a permanent fix on the same visit.
24/7 availability
We answer the phone at 2am. Water doesn't wait for business hours.
Insurance claim support
Every emergency call includes a written damage report formatted for insurance carrier submission.
“We answer at 2am. When water is coming through a ceiling, the time between the call and the first tarp is the entire job.”
“We answer at 2am. When water is coming through a ceiling, the time between the call and the first tarp is the entire job.”
Rated 5 out of 5Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
Rated 5 out of 5They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
Rated 5 out of 5I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
Blue Knight was, by far, the best. Responsive, ethical, totally professional — and their crew went above and beyond at no extra charge.
They installed a full new roof in one day. The crew worked around the house without us hardly knowing they were there.
I emailed at 4 a.m. and spoke with someone that same day. Estimate and completed work all within one day. Pricing was fair, work was excellent.
Luciano did not try to sell me a new roof. Appreciated the honesty — he showed up when he said he would.
We had a leak diagnosed by two other contractors who could not find the source. Blue Knight found it on the first visit and fixed it the same week.
Flat roof replacement on a commercial unit. Clean, fast, no surprises on the invoice. The crew left the site cleaner than they found it.
Called after a storm damaged our roof. Someone was on site within hours, tarped everything, and had us fully repaired before the next rain.
Had a slow basement leak for years. Every other company just caulked it. Blue Knight found the actual source and did a proper waterproofing job. No issues since.
Our neighbours recommended them for a valley repair. Small job, but they treated it like it mattered — showed up on time, matched the shingles perfectly, and charged exactly what they quoted.
Our Work.
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Rooftops across the GTA.
From downtown Toronto to the 905 and beyond, one crew, one warranty, twenty-five years of GTA rooflines.
Service availability may vary. Call (647) 383-8664 to confirm coverage for your area.
Emergency Roof Repair questions for Thornhill.
Typically within 60 minutes, and often less, since both halves of Thornhill are a short drive from our North York shop. What slows a call here is access rather than distance, particularly on the narrower older streets around Thornhill Village where staging space is limited.
Three things, in order. The crew stops the water with a secured tarp on a slope or a bonded temporary patch on a flat section, photographs the failure before it disappears under the covering, and then traces where the water actually got in. Before leaving we give you a written note of what failed, which becomes the starting point for both the permanent repair estimate and any claim.
Yes, every night of the year, holidays included. A leak left running until business hours has usually done most of its damage by then, so a night call is really about shrinking the eventual repair bill rather than about speed for its own sake.
In a Thornhill winter that is almost always an ice dam letting go. Over a stretch of cold days ice builds along the eave, meltwater from higher up the slope pools behind it and creeps under the shingles, and when the temperature shifts that water comes through into the ceiling. Covering the roof achieves nothing once the meltwater is in the assembly, so the work is opening a path through the ice for the water to escape and protecting the rooms underneath.
Yes, and on Thornhill houses it is one of the calls we get most. Thirty year old membrane is too brittle to tarp, so we bond a self adhered temporary patch over the opening that will stick in whatever the weather is doing that night, and we lay it so it does not form a new hollow for rain to sit in.
That is what it is written for. The damage is photographed before we cover it, and the report states what failed, the likely cause, and the repair we recommend. On a Thornhill roof that is thirty years old, the adjuster's main question is whether this was a sudden event or slow wear, and a dated, specific account is what answers it.
Stay off the roof and look after the inside: move furniture and anything valuable out of the way, put a bucket or bin under the drip, and if the ceiling has a sagging bubble of water, poke a small hole at its lowest point over a container so it drains in a controlled way instead of dropping the drywall. If water is reaching a ceiling light or an outlet, turn that circuit off at the panel. Take photos from inside as it happens, since those pictures often end up being the most useful evidence in the claim.
Usually, and it is worth doing, because the cause is almost always heat escaping into the roof space combined with intake ventilation that was buried when the attic insulation was upgraded. Clearing and restoring the soffit intake, correcting the insulation at the eaves, and sealing the air leaks from the living space below addresses that mechanism and ends the annual emergency. Where the covering is coming off anyway, ice and water shield at the eaves and valleys should go on at the same time.
Frequently yes, though it varies by policy and it is more often disputed than storm damage is, because a carrier may treat recurring ice damming as a maintenance issue rather than a sudden event. What helps is documentation that establishes this instance as a discrete failure with a date and a described mechanism, and what hurts is a history of the same leak every winter with nothing done about the ventilation. We report what we actually find either way.
There is an after hours dispatch component and we state it on the phone before we come out, not on the invoice afterwards. You will know what the callout costs before agreeing to it. What the emergency visit buys is containment, documentation, and a diagnosis, and the permanent repair is quoted separately in daylight so the two are never bundled into one number decided under pressure.
On a live leak we work in a fixed sequence. First the water is stopped or diverted, since each minute it keeps running soaks more insulation and drywall. Then, before anything covers the damage, it is photographed, because those images are what your insurer will judge the claim on and they cannot be taken after the fact. Only then do we go looking for the cause.
Emergencies on Thornhill's subdivision houses skew toward two causes. In any season with sustained rain it is the flat section over a garage or addition, where a brittle membrane finally opens at a seam. From December to March it is meltwater backing up behind ice at the eaves, usually on a house where an insulation top up smothered the soffit vents. The older houses around Thornhill Village add a third pattern of their own: storm water getting past chimney flashing and valleys that have been patched many times over.
Ice Dams and the Buried Soffit
The Thornhill winter emergency has a specific and repeatable cause. Warm air leaks from the living space into the roof space, the underside of the deck warms, snow on the upper slope melts, and the meltwater runs down to the cold eave and refreezes. Repeat that over several days and a ridge of ice builds at the edge, behind which water ponds and works its way under a covering designed only to shed water downhill.
The reason it is so common on this housing is a well intentioned upgrade. Attics were topped up with additional insulation at some point, and in a great many cases the new material was pushed out over the eaves and buried the soffit intake vents. Ventilation depends on air entering low and leaving high, so blocking the intake stops the airflow that would otherwise keep the deck cold and the snow unmelted.
Containment on the night clears a channel and protects what is below. The permanent fix is ventilation and air sealing rather than roofing, which is a cheaper conversation than most owners expect, and we would rather have it in September than in February.
The Flat Section Emergency
The call most particular to Thornhill comes from the low slope roof over a garage or a back addition, and it tends to arrive in a long steady rain rather than a thunderstorm. After years of going brittle, the membrane splits at a seam and starts moving real volume into the room underneath, which on an addition is often a finished family room or kitchen.
A tarp is the wrong tool on a surface like that: it floats on the standing water and funnels more of it into the split. Our trucks are stocked with self adhered temporary membrane for these calls, and before we leave we make sure the drain or scupper is clear, so the patch is not left sitting in a pond.
Tonight Is Containment, the Repair Comes After
We keep the night visit and the permanent repair apart on purpose. Once the water is stopped, the damage is on record, and the house is secure, the night's work is done. Pricing a full scope at that point would be guesswork, because nobody makes a good decision with a ceiling dripping and because the real extent on a Thornhill roof rarely shows until the wet materials have had a chance to dry.
You are left with containment in place, the before photographs, and a straightforward written account of what we saw. We price the permanent repair separately, in daylight. If the temporary work will hold for a few weeks while you collect other quotes, we tell you so.
We also cover nearby cities.
Ready to schedule your estimate?
We come to you, assess the roof, and give you a written quote. You are not obliged to proceed. Most estimates completed same week.
