The water courses will leak and on concrete roof tiles water will also leak over the upstream edge of the tile.
Rain water leaking from roof.
The first clue to help find the leak is when it happens.
Not to mention your gutters simply may not be able to keep up with the downpour.
Use a sponge to absorb any standing water.
If your roof vent only leaks during heavy rain you may be able to create a shield to prevent the rain from entering the vent.
And on occasion a hard driving rain with whipping wind will cause roof vents to leak water.
Even if your roof is well maintained or fairly new heavy rainfall is still a cause for concern.
The immediate thing to do is to contain dripping water from the leak.
It this is the case you need to create a breathable shield to slow the driving rain drops while still allowing air flow.
For example your roof might have a leak through the attic vent or roof shingle at the top.
Water could get into the attic or above your ceiling and either drip to the floor or roll along the stringer the long piece of wood that spaces out the roof trusses and runs the length of your house.
Is it after a rain storm or car wash.
Often wind driven rain comes in from above the roof especially around windows between corner boards and siding and through cracks and knotholes in siding.
Roof leaks in heavy rain learn why.
Across the joists lay a piece of plywood and put a bucket to contain the water and if necessary prepare a second bucket to replace the first when already full.
If the roof is in a tree zone leaves are washed into the watercourses and over time this leads to clogging and eventually blockage during heavy rain.
We all know that water obeys the laws of gravity so will always pool in the lowest area but it can run along wires travel up cardboard and fabric surfaces and generally do its best to disguise where it came from in the first place.
A roof that leaks is a problem in any weather but a roof that suddenly begins to leak during a heavy rainstorm can quickly turn into an emergency.
Dormer walls provide lots of spots where water can dribble down and enter the roof.
Watch this video to see how that s done.
Dirty or broken watercourses.
Caulk can be old cracked or even missing between.
How to fix leaking rain gutters.
If your roof vent leaks with gentle rains as well you may have a problem with the shingles around the vent or exposed or loose nail heads.
Water doesn t always come in at the shingled surface.
Over time rain gutters often start to pull away from the roof allowing water to drip over the gutter sides or between the gutters and the walls.
How to stop a leaking roof during heavy rains.