Wimington roofing 2

How to Deal With a Faulty Roof Valley

This is a potted guide to dealing with a faulty roof valley. It details the process that you may need to go through when fixing any problems and discloses what causes faults in the first place.

What is a roof valley?

A roof valley is usually found on an L shaped roof. It is the junction between two adjoining sloping roof surfaces. When it rains, this is the area that water runs down before it reaches the guttering.

If a roof valley becomes faulty, gets blocked or is damaged in any way, water can leak into the house causing damage to the home and its contents.

As a result, it is very important that they are kept in a good state of repair and that they are maintained often.

What causes roof valley problems?

Problems are regularly caused by defective mortar. Issues can also occur as the result of improper placement of roofing nails in the roofing installation process or because the shingles have become old and decrepit.

What repair work will be required?

As an example, this is the process that you will need to go through if the problem is caused by defective mortar:

  • Firstly strip down the valley and remove any flawed pointing.
  • Then fit new valley cuts to new mortar bedding to avoid breakage.
  • Once that is completed re-appoint the valley using a water resistant mortar.
  • Finally, add a lead apron saddle to the short lead flashing at the bottom of the valley.
  • Once the work is complete, test the work for water penetration.

It's a difficult job that requires specialist skills.

To avoid these problems in the future, make sure your roof valley, and your roof in general, is properly maintained and kept in a good state of repair.

A roof will often collect leaves, twigs and dirt. The best thing you can do is to keep the roof valley clear of debris. Otherwise it will get clogged up. If it does get clogged up, the least that will happen is that the build up of debris will disrupt the flow of water. But in some cases it will have an impact on your gutters too and could damage the flashing.

None of this is good for you, your roof or your home so I would check your roof valley at least twice a year, especially during autumn and winter months.

As a bonus of this, keeping your roof clear of debris will also extend the life of your shingle.

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