A simple thing like a cracked tile can cause immense problems for you if it rains heavy. Be aware that old terra cotta roofs are always prone to cracked tiles. This can be due to ageing as they get very brittle and can be subject to an effect called spalling where the back of the tile flakes away and weakens the tile.
Some new houses have incorrectly fitted flashings and valley irons that can lead to roof leaks.
At the very first sign of a problem roof leak you really should get it checked out by a professional. Persistent roof leaks can cause expensive repairs and might fuse your electrics.
Don’t be tempted to check it out for yourself – remember its dangerous up there and especially if its damp or wet and you have lichen or moss growing on your tiles.
WE SERVICE ALL MELBOURNE METROPOLITAN AREA