Roof leak repair in Kamloops

Water travels before it drops

Once water is past the weather layer it lands on the top of the roof deck or on the underside of the sheathing, and from that moment it stops behaving like rain and starts behaving like a river on a tilted table. It runs down the slope of the deck. It picks up the line of a rafter and follows the joint between framing and sheathing, because that corner holds a film of water better than open plywood does. It crosses a sheathing seam. It hits a strap, a wire, a truss plate, an insulation baffle — anything that interrupts the run — and that is where it finally falls.

So the mark on your ceiling is a record of the exit. It tells you where the travel ended. The entry can be metres upslope, on a different plane of the roof, and in a few genuinely annoying cases on the other side of a ridge, where water has come in near the top and run down the inside of the opposite face.

Where leaks actually start — in the order they get checked

Roofs rarely fail in the open field. They fail wherever the weather layer was interrupted to let something through it, or wherever two planes meet. That produces a search order, and it is not the order most people guess.

1. Penetrations firstPipe boots, vent stacks, exhaust terminations, skylight curbs. The rubber collar on a plumbing boot is the single most common answer — it sits in full sun, hardens, and splits in a ring right where it grips the pipe. It is also cheap to replace, which is why it gets checked first.
2. Flashing nextChimney step and counter flashing, the junction where a roof plane meets a wall, and the terminations at the ends of valleys. Flashing rarely fails in the middle. It fails at laps, at corners, and where somebody previously relied on sealant instead of a lap.
3. ValleysTwo roof planes converging concentrate the flow of both into one line. Volume is highest here and tolerance is lowest, so a valley that was woven or closed badly will hold for years and then let go under one heavy event.
4. Backed-out fastenersNail heads that have worked proud over many expansion and contraction cycles lift the shingle above and open a path beside the shank. The mechanism behind this is covered on the roof repair page — here it matters because a backed-out nail leaks a small volume reliably rather than a large volume occasionally.
5. The eave lineWater that has got above the weather layer at the bottom of the slope, usually by backing up behind ice. This one is seasonal and it is diagnosed by when it leaks rather than by what it looks like.
6. The field of the roof, lastIf the open shingle surface is genuinely leaking, the question has usually stopped being about a repair. That is a different conversation, and it belongs with the repair-or-replace decision.

The Kamloops difference: your leak hides between rain events

This is the part that roofing content copied from the coast gets structurally wrong, and it changes how a leak is found here.

Kamloops is semi-arid. Total annual rainfall is a fraction of what falls on the Lower Mainland, and crucially it does not arrive evenly — it comes in short, concentrated episodes with long dry stretches between them. On the coast a roof leak is a continuous phenomenon during the wet season: it starts in October and it is still going in March, which makes it obvious and makes it easy to test. Here, a leak is episodic. It runs for an afternoon and then stops for three weeks.

Three practical consequences follow, and all three cost Kamloops homeowners money.

A leak that stopped is not a leak that was fixed. It is a leak that is currently dry. Nothing about the opening has changed; the delivery of water to it has paused. People routinely conclude the problem resolved itself, and the next time they think about it is the following spring.

The evidence fades. A stain that gets wet once and then dries for a month lightens, and the edges soften. It reads as old damage rather than active damage, so it gets decorated over rather than investigated. Meanwhile the water is still going into the same cavity on the same schedule.

There are two separate wetting mechanisms, and they enter at different places. Rain and snowmelt are not the same test. Rain arrives from above at a rate; meltwater arrives slowly, from below the snowpack, and it can move upslope behind an ice edge in a way rain never does. A leak that only appears during a January thaw and a leak that only appears during a summer downpour have different causes even when the stain is in the same spot. That is why the most useful sentence you can give a roofer is not where it leaks but when.

What the water then does inside the building — the deck, the insulation, the framing — escalates on its own timeline. Those escalation paths are set out on the main roofing page. What matters on this page is that the episodic pattern means you get less warning here, not more, despite the drier climate.

What to tell a roofer before they arrive

The search gets shorter if you hand over the history, and none of this needs a ladder.

1. When does it happenHeavy rain, hours after the rain, during a thaw, during wind, or with no obvious trigger. This single answer eliminates whole categories before anyone goes up.
2. How long is the delayWater appearing within minutes suggests a short, direct path. Water appearing the next morning suggests a long travel across the deck, or a saturated material releasing slowly.
3. Where does the first drop landNot the extent of the stain — the first point. That is the exit, and it is the starting coordinate for the trace.
4. Has it happened beforeIncluding any previous repair, and where it was done. A leak that returns near old work usually means the wrong opening was closed the first time.
5. Leave the stain aloneDo not paint over it and do not cut it out yet. Its shape, edge and any staining pattern in the attic above it are the evidence.

How the trace is actually run

Most leak finding happens from inside, not on the roof. The attic is where the story is written.

A roofer starts under the exit point and works upslope, reading the underside of the sheathing for the track: darkened wood, mineral staining, rusted nail points, compressed or discoloured insulation. That track usually leads somewhere — to a penetration collar, to the back of a chimney, to a valley line — and where it stops is the candidate. A daylight check helps at the same time: with the attic lights off, an opening at a penetration or a lifted flashing edge frequently shows as a pinpoint of light.

If the attic evidence is ambiguous, or the roof has a vaulted ceiling with no attic to read, controlled water testing is the confirmation. It is done in sections, from the bottom of the slope upwards, isolating one area at a time with enough patience between sections to let a positive result appear. Running a hose over the whole roof at once proves only that the roof leaks, which was already known.

Then, and only then, is the opening confirmed from the roof side and the repair scoped. If water is coming in while you are reading this, the order changes — containment comes first and the trace happens in daylight. That is covered on emergency roof repair. And if the leak started with a specific storm, the cause is worth establishing for reasons beyond the repair itself, which is the subject of storm damage documentation.