Attic Rain & Attic Inspection
Attic Rain Repair & Attic Inspection in Calgary
Every January and every chinook, my phone rings with the same call: water is coming through my ceiling, my roof must be leaking. Most of the time the roof is fine. What you have is attic rain, and no amount of roof repair will fix it, because the water never came from outside.
Hi, I’m Sokol Preka. I climb into the attic before I quote anything
I’m the owner and operator of EZ Roof Repair. I say that up front because the diagnosis is the whole job here. If the shingles are the problem, I will tell you. If the problem is the air in your own house, I will tell you that instead.
If it turns out you have an actual leak, we handle that as a Calgary roof repair instead, and I will say so plainly.
What attic rain actually is
Attic rain is interior condensation that freezes and then thaws inside your attic. It happens in four steps.
- 1
Warm, moist air escapes your living space
It leaks out through gaps around pot lights, bathroom fans, plumbing stacks, and the attic hatch.
- 2
That moisture freezes onto the roof deck
The air hits the cold underside of your roof sheathing and the moisture in it freezes on contact. Through a Calgary December and January, frost builds into a layer of ice across the whole underside of the deck.
- 3
A chinook arrives
Rooftop temperatures jump above freezing in a matter of hours.
- 4
All of that frost melts at once
It rains down through the insulation, through the drywall, and onto your ceiling, often in several rooms simultaneously.
That is why the ceiling stain appears on a warm, dry, sunny day rather than during a storm. A roof leak follows the weather. Attic rain follows the thaw.
Why Calgary gets attic rain when Vancouver does not
Two conditions have to line up, and Calgary supplies both.
Sustained deep cold
It keeps the roof deck below freezing long enough to bank a serious quantity of frost. A mild coastal winter never accumulates it.
The chinook release
A chinook releases that frost faster than any attic can dry. Chinooks run through most of a Calgary winter, and one can lift the temperature 20 °C, occasionally 30 °C, in a matter of hours. Gradual spring warming lets an attic vent the moisture off harmlessly. A chinook does not give it that chance.
Add modern construction to those two conditions and the problem intensifies. Houses built to current airtightness standards trap far more interior humidity than a 1960s bungalow ever did, so more moisture is available to escape into the attic in the first place.
How to tell attic rain from a roof leak
I check these five before I quote anything.
Timing
Attic rain shows up during a thaw or a chinook. A roof leak shows up during or right after rain, wind, or melting snow on a specific slope.
Location
Attic rain typically appears in more than one room at once, and often near the centre of the ceiling. A roof leak tracks back to one penetration, one valley, or one wall.
Frost on the sheathing
I go into the attic and look. A continuous white layer across the underside of the deck in winter tells me to stop looking at your shingles.
Rusted nail tips
Roofing nails poking through the deck rust when they collect condensation year after year. Rusty nail points tell me this has been happening for several winters, not one.
Wet insulation with a dry roof
If the insulation is damp but the shingles, flashing, and underlayment above it are sound, the water came from below.
Where the moisture is getting in
The source is almost always in your ceiling. On a Calgary attic inspection I check every one of these.
-
Bathroom exhaust fans terminating in the attic
This is the moisture source I find most often. A shower dumps warm humid air straight into the coldest part of the house instead of venting through the roof or the sidewall.
-
Dryer vents disconnected in the attic
Rarer, worse, and it happens.
-
Pot lights and ceiling fixtures
Older non-IC-rated cans are essentially open holes into the attic.
-
The attic hatch
Uninsulated and unweatherstripped hatches leak air continuously.
-
Plumbing stacks, wiring penetrations, and top plates
Small gaps, dozens of them, and together they move real volumes of air.
-
A torn or discontinuous vapour barrier
Usually from renovation work that nobody sealed back up.
-
Humidifiers running too high
In Calgary cold, indoor humidity above roughly 30% will find its way into your attic, and the Alberta New Home Warranty Program advises dropping to 20–25% during a deep cold snap. I check your settings before I sell you anything.
What my attic inspection covers
I do the inspection myself, and I do it from inside the attic, not from the driveway with binoculars.
- Frost, ice, and staining on the underside of the roof sheathing
- Insulation depth, coverage, and moisture content
- Vapour barrier condition and continuity
- Every ceiling penetration and its air sealing
- Bathroom and dryer exhaust routing and termination points
- Soffit intake vents: blocked soffits are the ventilation defect I find most often, usually buried by blown-in insulation
- Baffles at the eaves, and whether the intake path to the ridge is actually open
- Exhaust venting: static box vents, ridge vent, or turbines, and whether they are correctly sized
- Roof deck condition, rot, and mould growth
- Photographs of everything, so you see what I saw
You get a written report with those photos. If the attic is healthy, the report says so and the inspection ends there.
How I fix attic rain, in this order
Skipping steps, or doing them out of order, is why attic rain comes back the following winter.
- 1
Air seal the ceiling plane
Stop the moist air at the source. I seal ceiling penetrations, gasket and insulate the attic hatch, repair the vapour barrier, and box and seal non-IC pot lights. No ventilation upgrade works while warm humid air still feeds the attic from below.
- 2
Correct the exhaust routing
I terminate every bathroom fan and dryer duct through the roof or the wall with an insulated duct and a proper hood, never into the attic, and never into a soffit, where the air simply gets pulled straight back in through the intake vents.
- 3
Restore intake and exhaust ventilation
The Alberta Building Code requires a minimum unobstructed vent area of 1:300 of the insulated ceiling area on roofs sloped 1:6 or steeper, split roughly evenly between low intake and high exhaust. Most of the Calgary attics I open fail this, not because the vents are missing, but because insulation buried the soffits and no baffles were ever installed. I clear the soffits, install baffles at every rafter bay, and add or resize exhaust venting at the ridge.
- 4
Top up the insulation last, not first
Once the ceiling is sealed and the attic breathes, I bring insulation up to depth. Alberta Building Code Section 9.36 sets the attic requirement for Calgary’s climate zone at an effective RSI 8.67 (R-49) in a home with a heat recovery ventilator, and RSI 10.43 (R-59) without one. Plenty of Calgary homes built before 2000 are sitting at R-20 to R-30. Adding insulation before air sealing is the classic mistake: it buries the soffit vents, makes the deck colder, and produces more frost than you started with.
Ventilation work happens on the roof, which is why this belongs with a roofer rather than an insulation contractor alone. When a customer needs both a new roof and an attic fix, I do the ventilation as part of the roof replacement and the venting gets designed once, properly, instead of retrofitted twice.
Attic rain in newer Calgary homes
Attic rain is not an old-house problem. I see it constantly in homes under ten years old: new houses are built tight, they hold humidity, and the attic is the only cold surface available for that humidity to condense on.
Alberta’s new home warranty runs in tiers: one year on labour and materials, two years on delivery and distribution systems, which is where a ventilation defect lands, five years on the building envelope, and ten years on structure only. If your home falls inside the applicable tier, attic rain caused by a construction defect (an unvented bath fan, missing baffles, a poorly sealed vapour barrier) may be a warranty claim rather than a bill you pay.
My inspection report documents the defect with photographs, which is what a warranty provider will ask you for. Bring it to your builder before you bring it to me.
What attic rain repair costs in Calgary
Six things move the number, which is why I quote after the inspection rather than over the phone.
- Attic square footage
- How many ceiling penetrations need sealing
- Whether exhaust ducting has to be rerouted
- How many rafter bays need baffles
- How much exhaust venting gets added
- How much insulation goes back in
Free
Attic inspection & report
On-site inspections and leak diagnosis are free across Greater Calgary.
$2,500 – $3,000
Roof vent replacement
Replacing goose-neck and plumbing vents, redoing the deck connections and re-shingling around them.
Quoted on site
Air sealing, baffles & insulation
Scales with attic size, penetration count and rafter bays, so it gets priced once I have been up there.
My promise does not change here: your quote is your invoice. Whatever number I write down after I have been in your attic is the number you pay. Full pricing across my services sits in my Calgary roofing cost guide.
What happens if you leave it
Attic rain gets more expensive every winter it runs.
Your heating bill climbs
Insulation loses its R-value when it gets wet, so your furnace works harder while the problem is still invisible.
Mould grows on the sheathing
Attic mould turns a ventilation repair into a remediation job.
The roof deck rots from underneath
Once plywood delaminates, the fix stops being an attic job and becomes a tear-off with sheathing replacement.
Ceiling finishes keep failing
Drywall, paint, and ceiling finishes fail and get repeated every thaw.
It shows up when you sell
Stains and attic frost land on the home inspection and cost you either the price or the deal.
Attic and ventilation work in Calgary
Real jobs, photographed on site. Click any photo to enlarge it.
Who does the work
I do the attic inspections personally. My own crew performs the repairs. EZ Roof Repair does not subcontract attic or ventilation work. Attic ventilation and air-sealing work carries our 3-year written labour warranty, detailed on the warranty page.
EZ Roof Repair inspects and repairs attics across Greater Calgary, Airdrie, Cochrane, Okotoks, Chestermere, and Strathmore.
- Alberta corporation
- #2023600071, incorporated July 6, 2021
- Liability insurance
- $2,000,000 Commercial General Liability, active
- WCB-Alberta
- Active account #9372476 (Residential Roofing) since April 14, 2022
- City of Calgary licence
- #16375420
Attic rain FAQs
Is attic rain covered by insurance? +
Usually not. Most Alberta home policies treat attic rain as a maintenance and ventilation issue rather than sudden accidental damage. Resulting damage is sometimes covered even when the cause is not, so report it and let your adjuster decide. My photo report gives them something concrete to work from.
Will more insulation fix attic rain? +
No, and adding insulation first often makes it worse by burying your soffit vents. Air sealing comes first, ventilation second, insulation last.
Will more roof vents fix attic rain? +
Not on their own. Exhaust vents without open soffit intake pull air from inside your house through every ceiling gap, which feeds the attic more moisture, not less. Intake and exhaust have to be balanced.
Can I fix attic rain myself? +
You can lower your humidifier setting and confirm your bathroom fans actually vent outside, both worth doing today. Air sealing a ceiling plane and installing baffles means working in a cold attic on joists above drywall, and a foot through a ceiling costs more than the inspection.
When should I book an attic inspection? +
Late fall, before the frost has a chance to bank. The second-best time is the moment you notice a stain during a chinook, while the evidence is still visible.
Do you fix attic rain and the roof at the same time? +
Yes, and it is usually cheaper. If the roof is due anyway, we design the ventilation and replace the roof in one mobilization. See roof replacement in Calgary.
Is attic frost normal in Calgary? +
A light dusting on the nail tips during an extreme cold snap is common. A continuous white layer across the sheathing is not, and it will come down on your ceiling when the chinook hits.
Book an attic inspection
I go into the attic, photograph what is happening, and tell you whether you have a roof problem or an air problem. No guessing from the ground. - Sokol Preka, Owner & Operator, EZ Roof Repair Inc.
More From EZ Roof Repair
Our Other Roofing Services
Roof Repair in Calgary
Whether you need a simple roof leak repair, roof leak detection, shingles repair, Calgary flat roof repair, or any other service, you can count on us for ALL OF IT.
See roof repair →
Roof Replacement in Calgary
Full tear-off, new underlay, new flashings and architectural shingles from Malarkey, Owens Corning or IKO, with a 10-year written labour warranty.
See roof replacement →
Flat Roofing in Calgary
Torch-on SBS, EPDM rubber, TPO and PVC membranes for homes, modular properties and commercial buildings, with core sampling before any replacement quote.
Compare flat roofing systems →
Class 4 Hail-Resistant Roofing
Class 4 hail-resistant shingles to protect your Calgary home against the area’s worst weather, plus full hail damage inspections and repair.
See hail-resistant roofing →
Skylight Repair & Installation
Expert leaky skylight repair and new skylight installation in Calgary. Quick, efficient fixes that keep your home sealed and dry.
See skylight repair →
Concrete & Clay Tile Roofing
Concrete and clay tile repair, lift-and-relay underlayment replacement and new installation, including discontinued profile matching.
See tile roof repair →
