Its the regular work that keeps your property safe.
Fascias and soffits play a major role in draining the moisture from the structure of your roof. While the name sounds alien, you would have definately seen these boxes under the roof and around the house.
They are the part of the guttering. First, fascias keep the gutters in the correct position. It's essential that the water flows down the drainage pipe, instead of splashing against the roof. Second, they collect the moisture and help it evaporate through the soffits on the underside of the structure. As long as the mechanism works correctly, your roof remains secure.
What seems to go wrong so frequently? If the gutters fill up with fallen leaves or the drainage pipe gets clogged, water splashes over the edges onto the boards on the underside of the roof. They absorb the moisture and start to lose shape and rot. From such a point damage spreads through all the layers of your roofing. Rainwater starts to leak inside. This can lead to major loses, if you fail to stop the process.