GRP Flat Roofing is far by one of the leading flat roofing materials to consider. GRP is lightweight, easy to maintain and reliable. It is also maintenance free, and most issues can be patched. Not to mention the fact that its 100% waterproof, with no glue joints, seams, etc. It is strong enough to support the weight of people walking on of it. Most flat roofing Nottingham at least in newer homes are GRP because it is a highly recommended material.