If it was installed properly there shouldn t be any water running behind the siding and causing issues.
Water leaking behind siding.
Check to be sure weep holes are open along bottom of window openings.
The extra thickness of the vinyl.
However it is possible for water to get behind the siding if it s not installed properly.
While gaps and openings permit leaks behind the siding some siding openings are normal such as aluminum or vinyl siding bottom edge vents.
As gravity takes over and pushes the rainfall downwards you better hope your siding was installed correctly.
The presence of a housewrap on modern buildings or felt on older buildings combined with proper flashing at windows doors and other openings are relied upon to keep water from entering the structure itself.
If your gutters are not directing the water to the downspout system the siding takes the brunt of the torrent resulting in wear and tear as well as water damage.
Caulk along the seams of the siding where it meets the window.
Preparation for siding while correct installation reduces the risk of water running behind the siding it can t completely stop it.
Water leaks at soffit or eave overhang penetrations for chimneys that permits water to leak at the roof surface then pass behind the siding if the chimney is not properly flashed.
If an installer uses a material such as incorrectly this only exacerbates the problem.
Vinyl siding is designed as an exterior cladding only and is supposed to be installed over other materials such as a weather resistant barrier.
Rainwater leaking from a gutter ends up behind siding and causes a wall to rot.
If there are gaps and water can get in you can use tri polymer caulking to fill it in.
Some areas were extremely heavy while others were just a single streak.
At some point in the past an owner had vinyl siding installed over old siding.
In this video this old house general contractor tom silva shows how to prevent water from leaking in behind vinyl siding.
In most communities building codes require a moisture barrier.
Step 2 you can also check above the window or door to see how the siding is attached there.
Vinyl is a potentially leaky material and water trapped behind siding leads to decay and mold.
Some areas were extremely heavy.
Bottom to top rain will hit the roof and make its way down your siding until it hits the ground.
This is a caulking that s flexible and works well with vinyl siding.
Inspect the area above the leak including both indoors and out.
