Valley gutters are formed when two roof pitches join at the base, forming a v shape. The gutters are largely horizontal with a slight slope to the rainwater downpipe at the end.
These types of gutters are often lined with lead, bitumen felt or asphalt. Typically lead lined valleys last longer, with an expectancy of up to 80 years. Felt lined valleys however only have a lifespan of 10-15 years.
Problems with valley gutters
Valley gutters are a common source of roof leaks. In this case out of sight often means out of mind. Valley gutters tend to be high up and not visible, this means they are often neglected when it comes to maintenance. Over time moss and leaf debris builds up this can block the gutter. This means that the water doesn’t drain efficiently. As seen in the example above if the valley has an internal rainwater feature it is at higher risk of blockage because the exit hole is smaller.
When the gutter becomes blocked the water rises up and damages the roof felting, this can cause, damp, fungal decay and damp below.
Maintenance of Valley Gutters
If you have a valley gutter to your house you should inspect it regularly. Normal maintenance including clearing and inspecting for holes in the lining is required.
How a survey can help
Here at Crookshank & Co we use a 5 metre camera pole, this allows us to look into the valley gutters during our inspection. In our report we will outline to you the condition of the valley gutter and any signs of leaks we have spotted. This ensures that you know the condition of the hidden features you can’t always see when viewing a house. Get in touch with Crookshank & Co to discuss how we can help you!
A few examples below:
Crookshank & Co blog on valley gutter defects.
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