4 the gutter is too low allowing the water access to the back of the gutter.
Water dripping down siding.
This can be accomplished by using a portable field brake.
It can get behind the siding and cause serious problems within the walls as well as leakage in the basement or crawl space.
Since water runs downward unless it s being driven by strong winds the standard method for.
The shingles should be hanging about 1 4 inch to 1 2 inch beyond the drip edge so this may be your problem.
Cover the exterior casing with aluminum or vinyl trim sheet.
J channel is a poor design if not flashed well it allows water to get in behind siding.
At some point in the past an owner had vinyl siding installed over old siding.
Vinyl siding requires special inside and outside corner units in addition to the trim that.
Use a caulking gun to apply a continuous bead of silicone sealant along the vertical seams between the vinyl.
Check to be sure weep holes are open along bottom of window openings.
Water should not be allowed to run down the siding.
3 improper offset of the starter strip creating a seam that allows the water to travel behind the drip edge and fascia onto the soffit.
1 drip edge is caught behind the gutter.
Rainwater leaking from a gutter ends up behind siding and causes a wall to rot.
If you see the stepflashing drain behind the siding the paint under the butts will keep it from draining out and still if the lap is below the first stepflashing all the water will drain behind.
The extra thickness of the vinyl.
If there plugged up water can get behind them and run down the soffits.
How to prevent water from flowing under vinyl siding gravity and shedding water.
Not having any shingle over hang or drip edging can also allow water to get behind the fascia.