Your roofing insulation choice needs to give you that important rigid roof insulation r value that meets the specification. It also needs to deliver that insulation r value consistently over time. EPS (expanded polystyrene) panels are often selected for their long-term thermal performance balanced with a good budget-friendly price. The solid sheets stay intact and in place when installed, controlling the heat distribution and hence insulation performance over a wide area. Call Universal Foam Products on 410-498-0000 for expert advice on rigid roof insulation.