You must be taking utmost care of your lovely house. But what will you do if water leaks from the roof corners, edges, vents, dormers etc. during rainfall? Sometimes during construction of the roofs some gaps are left. However flashing roofs are a good way to safeguard your roof. You can use aluminum flashings in the roof edges and fix them tight with rust proof iron nails. Just believe me as I did it myself and you never have to move around anybody. You will not find water leaking through the roofs. Flashing roofs is very much cost effective process.