An insulated roof, particularly a flat roof, may need a combination of materials to achieve both insulation and effective drainage. EPS (expanded polystyrene) sheets are one of the first choices in the construction industry for flat roof insulation. Not only can they be combined together to achieve the insulation thickness required, they are also easily tapered to achieve accurate drainage. Call Universal Foam Products 410-498-0000 now for more advice on effective flat roof insulation.