Typical Roof Problems
Dirt and debris collects in the
valley. It creates a dam behind the
tiles causing water to over-flow onto
Water has ponded behind these batten
causing complete failure of the roofing
felt (notice right above the batten).
The water-stained areas can be
clearly seen here. Ponding behind
battens causes damage to a large portion
of the felt underlayment.
You can see by the lap on the
underlayment, the roof was double
felted. Some people believe that double
felting a tile roof will protect it.
This roof is only 7 years old. Double
felting has failed here very quickly.
The felt underlayment is the last
line of defense. Once the underlayment
fails, moisture makes its way into the
Once water gets under the felt
underlayment, the sheathing begins to
fail. The water will make its way to a
seam and then into the house.
The felt in this picture has been
rotting away for some time. The axe
shows where the sheathing has completely
rotted away. This can become very, very
- Internal dry rot
- Rotting sheetrock