While flat-roofs have become more and more popular among home-owners throughout the UK, many of them have since become aware of flaws in the design structure.
Flat-roofs, while great in many ways, are certainly less effective at negating water damage than a traditional pitched-roof structure. Pitched-roofs are highly effective at negating any water contact, as they are designed to have the water roll straight off the tiles of the roof, while with a flat-roof, puddles can begin to form on the surface.
Standing pools of water can be very damaging to the materials roofs are typically made of; reducing the lifespan of any flat-roof to below the point where having one in the first place is worthwhile.
Thankfully, over the last decade, chemists have been tackling this issue, and have come up with a variety of materials and substances which are far more at water-proofing a surface than anything that was previously available. You should be able to easily apply such a material to your flat roof, giving you a roof which will have a far longer lifespan.