"Mystery roof leak and ice damming prevention

Homeowner called us with a very unusual roof leak.

This water stain appeared at the base of the wall
Somehow this is taking place and running down the wall
Behind the drywall

We checked the attic,found water stains running down a rafter
Which led to this dryer vent.
So much lint had a serious effect.
condensation

The blockage was removed.

We also realized this vent had only been nailed at the top
The small gap at the base could allow wind driven rain.
we drove additional fasteners

Applied a bead of urethane based caulk.
Snow and ice tend to accumulate around this vents.
A watertight seal

Homeowner also mentioned,water was not running down the downspout.
It was simply dumping the water over the side.
This downspout was completely clogged shut.
The dirt and debri were packed solid.
This was 3 stories up.
Only a roofersview.

Preventative maintenance
At least once a year to avoid this type of problem.
This was ice damming waiting to happen