Do your valleys collect debris in them? It is just as important to clean the valley as the gutter. Blocked valleys can cause water ingress and you may get water damage to your ceiling, insulation in the cavity, etc.
The debris sitting on the roof and in the valley can cause decay to the roof if left over time. A blockage can occur at the bottom of the valley where it meets the two gutters and an overflow may result or the water could be redirected sideways into the roof cavity.
Valleys can be difficult to clean. Why not call the professionals in to have a look and provide you with a free quote? Ph 1300 654 253 or email us with any questions you may have, email@example.com.