It depends on the material you use, but if your flat roof is installed correctly it should last for at least 10 years, and at least 20 if a material other than felt is used. Always question a roofing company when they quote to find out what materials they use and what guarantee's they offer.
Isle Of Benbecula
Benbecula is an island of the Outer Hebrides, in the Atlantic Sea off the west coast of Scotland. In the 2011 census it had an usually resident population of 1,283, with a large portion of Roman Catholics. It forms part of the location provided by Comhairle nan Eilean Siar or the Western Isles Council. The island is about 12 km from west to east and also a similar distance from north to south. It exists in between the islands of North Uist as well as South Uist; it is linked to both by roadway causeways. Traveling to any one of the various other Hebridean islands, or to the British mainland, is by air or sea. Benbecula Airport on the island has day-to-day flights to Glasgow, Stornoway and Barra. A direct service to Inverness was presented in 2006 yet ceased in May 2007. There are no straight ferryboat services from Benbecula to the landmass, however a solution operated by Caledonian MacBrayne from Lochboisdale on South Uist gives a five-hour crossing to Oban on the mainland, whilst an additional service from Lochmaddy on North Uist provides a two-hour going across to Uig on the Inner Hebridean island of Skye, and hence to the landmass using the Skye Bridge. Ferry services from the islands of Berneray (connected by causeway to North Uist) as well as Eriskay (linked to South Uist) attach to the other Outer Hebridean islands of Harris and also Barra respectively. There is a thick collection of lochs across nearly the entire island, and almost all of the island is below 20 metres in altitude.