Manufacturers of EPS - Expanded Polystyrene
Cove Sills
Contractors and architects are increasingly finding that roofing systems using expanded polystyrene (EPS) can meet the needs of the most demanding building requirements. EPS offers measurable energy savings, long-term R-value, effective water resistance, dimensional stability and strength when properly installed and protected from moisture. These systems may include flat and/or tapered foam insulation for use in traditional built-up assemblies and most single ply membrane systems.
Expanded polystyrene is molded into large blocks and then cut to obtain the desired pitch, ranging from 1/16" per foot or greater. Tapered EPS insulation provides the required positive slope to drain while retaining the structural and economic advantages of a flat roof deck. EPS can be applied in a single layer creating a continual form. This design versatility translates into considerable savings in labor and framing costs. Usually the ridges and valleys necessary to provide correct drainage are supplied at 45 increments to the horizontal, but custom angles can easily be furnished.

Moisture is extremely detrimental to any roofing system. The purpose of the membrane is to keep the water out. However, in the event of water penetration, EPS has been shown to effectively resist moisture and retain its mechanical properties. The moisture content of EPS insulation samples ranging in age from 6 to 15 years was found to be very low, i.e., a maximum of 0.04% by volume. Likewise, results for R-value performance indicated no deterioration in R-value over time, meaning EPS thermal resistance values may be used without adjustments for aging.

Tapered EPS Board
Custom EPS Valley
Custom EPS Hip
EPS roof insulations are compatible with most commercial roofing systems, including, but not limited to built up roofing and modified bitumen systems and single-ply membrane systems that are either ballasted, mechanically fastened or fully adhered. Expanded polystyrene insulation meets the requirements of ASTM C 578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation. When specifying EPS insulation using ASTM C 578, the best possible product selection is ensured.
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