The time usually comes when those tiles are old and leaky and do nothing to make your home look good or keep its value. It is time for re-roofing but what material should you choose? Staying with tiles will eventually give you the same problem that makes your home look rather old and awful right now; namely, mould.
This black growth over your roof is one of the major problems of tiles. It is hard to remove and often keeps coming back. This is because the roots penetrate into the tile and cannot be scrubbed away. After you have gone to the cost or time of having it all washed down and treated it will end up back on your roof as bad as ever.
Tiles are not good for another reason. Because they are so small they need to have a lot of infrastructure underneath to support them. And because they are quite heavy it needs to be strong, so no cutting costs there. In addition, the very shape of tiles and the way they have to be aligned means that there are many niches in and around each one. In bushfire season, this allows red hot embers that are blown onto your roof to lodge there securely, thus your roof is most likely to catch on fire, so installing fire protection with the help of Fire Services Perth would be advised.
Happily there is a great alternative to tiles. Steel roofing does not have any of the above problems. It is light and the sheets are large, so less infrastructure is needed and it is quick to erect. No mould can grow on it because it does not absorb moisture; the spores cannot get a hold in it.