When you spend money on materials and building supplies, you want to know that the end result will be hard-wearing and live out its life. Some things you might expect to last a year or so – a shower curtain for example. But there are things you expect to be there year after year – things like bathtubs, paving tiles and such. It’s not possible that a shower curtain and paving tile be covered by the same guarantee, so there is no standard guarantee for the life of a product. However, there when you buy building products from a building supplies store, there is often a guarantee given by that store to cover all the goods to the extent that when you open the packet at home you are going to find a fully functioning, unbroken and ready to go shower curtain (or paver!).