The damage that differentiates roof damage from damp, boiler failure, electrical faults, and the rest is the damage that happens out of sight until it no longer does. As a result of this, months, even years, pass between the cause and the effect, as in the case of a stain on a bedroom ceiling. It is this invisibility that is the main cause of the high price of roof repair. On the one hand, you don’t see it until it is too late, and on the other, when it does eventually become visible, the damage is often severe. For Roofers Gosport, consider https://www.randsroofing.co.uk/roofing-services/roofers-gosport/
Under the felt, between the old tiles, within the roof structure, and between the cyclical, frost-and-thaw stresses on the lead flashing, an insidious damage spread and festered without being noticed, for months, even years. This can be anything from mortar crumbling away between tiles, the lead flashing expanding and contracting to the freeze-thaw cycle, to small cracks appearing at the very edges of the slate.
Once the damage has progressed to the point where the structure is weakened, and water finds its way through the outer layers, it will not simply disappear. It will not stop at the felt. It will continue down to the roof timbers, between them, through the felt, down the other side, and eventually, into the building. In doing so, it will leave a ceiling stain at the point where the structure becomes weakened, marking the end of its remarkable journey through a roof, out of the other side, and through a gap, from earlier in time.