Roof Leak Repair in Ontario, CA
Most leaks are not where the stain is. We trace the water back to where it gets in, fix that spot, and send you photos of the cause and the repair. A leak fixed at the source stays fixed.
Why the Stain Is in the Wrong Place
Water that gets past a tile or a shingle lands on the roof paper. It runs downhill on that paper, then along a rafter, and only drips when it finds a low spot. A stain in the hallway can start six feet uphill at a cracked tile or a dried out pipe boot.
That is why a patch right above the stain so often fails. The real hole is somewhere else, and the next storm finds it again.
How We Trace a Leak
We start in the attic. Wet or dark wood, rusty nail tips and damp insulation show the path the water took. We follow that path up the slope with a flashlight and mark where it begins.
Then we go on the roof above that mark. We lift tiles or check shingles there, look at the flashing and the vents, and find the opening. When it is dry and the source is hard to see, we run a hose on one small area at a time, low to high, while someone watches inside.
The Leaks We Find Most Around Ontario
Pipe boots split by the sun. Worn out paper under 25 to 30 year old tile. Flashing where a second story wall meets a lower roof. Skylight curbs with dried out seals. Valleys packed with leaves that hold water against the roof.
Each one has its own fix. Some take an hour. A tile roof with worn paper across the whole roof needs a lift and relay, and we will show you the photos that prove it.
Why Patches From a Can Fail
Spray sealer and roof cement look like a fix. On a vent or a seam they can hold for a season. Then the sun cracks them, water gets under the edge, and now it is trapped and harder to find.
We take old patch material off when we can and fix the part that failed. Our post on Flex Seal and roof leaks covers when a can is fine for a day and when it makes things worse.
When Leaks Show Up Here
Ontario gets about 11.6 inches of rain in a normal year, and close to 10 of those inches fall from November through March. A roof can hide a problem all summer and then leak on the first big storm.
Heavy or wind driven rain gets pushed under tiles and up past flashing that has a small gap. If your roof only leaks in hard rain, read our post on roof leaks in heavy rain.
Roof Leak Repair in Ontario, Rancho Cucamonga, Upland, Chino, Chino Hills, Fontana, Montclair, Eastvale, Pomona, Claremont.
Questions People Ask
Can you fix a leak while it is raining?
We can stop the water with a tarp during rain. The real repair happens once the roof is dry, because sealants and new material need a dry surface.
Why does my roof only leak in heavy rain?
Light rain runs off normally. Heavy or wind driven rain gets pushed under tiles and up past flashing that has a small gap. That points to a flashing or underlayment problem, not a hole.
How do I know the leak is the roof?
A stain that grows on a dry day is often plumbing or an air conditioner drain line, not the roof. A stain that shows up only during or after rain is usually the roof. We check both when we are in the attic.
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Where to Find Ontario Roofing
4335 E Lowell St Ste G, Ontario, CA 91761
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