5 Most Common Causes of a Leaking Roof

Discovering a problem with your roof can be one of the most concerning issues you come across as you may not be able to determine the cause of the problem yourself and will subsequently worry about the cost of the repair work. One of the most common problems associated with roofing are leaks, so we at Abbey Roofing thought we’d run through five of the most common causes for a leaking roof so the next time it happens to you, you can determine the root cause of the problem yourself ahead of calling upon our experienced team to repair it.

Failure of Underlay

Whilst roof tiles and slates are designed to keep out any rain, there is always the chance that strong winds can lead to rain forcing its way through any gaps or underneath the tiles. The underlay is then designed to carry this water away to the guttering however overtime, and with continued exposure to the rain, the underlay can begin to rot, not function effectively and ultimately fail, leading to a leak.

Slipped Tiles or Slates

Slipped tiles or slates will be very easy to notice and can result in larger amounts of rainwater hitting the underlay and putting it under increased pressure. If pools of water then build up in the area where a tile or slate has slipped, a leak into the inside of the roof is increasingly likely to happen.

Damaged Roof Junctions

A particularly common cause of a leak is through the incorrect installation or damage to the flashing at junctions on the roof. Even the slightest damage can escalate rapidly when a large amount of water is directed to this area and will ultimately result in a leak.

Lean-to Extensions

If you have a lean-to extension that the water from main roof on your house is discharged onto, there is a significant chance of this roof leaking. The tiles and underlay will be unable to cope with such large volumes of water over a prolonged period of time and will eventually cave under the pressure, causing a leak.


Whilst not a direct cause of damage to your roof, a poorly ventilated roof space can lead to condensation forming on the underside of the underlay or tiles. This can eventually lead to droplets of water leaking through your ceiling, giving the appearance of a leaking roof.

Now that you are aware of five of the most common causes of a leaking roof, you should be in a better position to evaluate the problem in your home the next time one arises.