Learn about Graphite Polystyrene Structural Insulated Panels

Building professionals gravitate towards structural insulated panels (SIPs) for more energy-efficient construction. They do an effective job of reducing the transfer of vapor, air, and heat through the wall assembly. It provides continuous insulation across the panel, few gaps, and reduced thermal bridging. In a recent study, U.S. Dept. of Energy's (DOE) Oak Ridge National Laboratory found that SIP structures are up to 15 times more airtight than stick-built walls with fiberglass insulation. Traditionally, SIPs have been produced using a variety of cores such as expanded polystyrene (EPS), extruded polystyrene (XPS), polyisocyanurate (ISO) and polyurethane (PUR).

Graphite polystyrene (GPS) insulation is relatively new to the market and is recognizable by it's gray charcoal/platinum finish. It's easily distinguishable from the most commonly used core, EPS, which is bright white. GPS insulation is EPS based and integrates high-purity graphite throughout the EPS polymer matrix (insulation bed).

Graphite polystyrene can achieve a higher R-value than many traditional SIPs. Graphite polystyrene can also be an option for space-contained wall assemblies as it can meet energy code requirements with a thinner panel. Graphite polystyrene should have an R-value of 4.5 to 5 per inch.

The key benefits of choosing graphite are that you can achieve a higher r-value with a thinner panel, which can reduce the freight cost and the size of accessories and fasteners.

Structures built using structural insulated panels are up to 15 times more airtight than traditional stick-built walls with insulated with fiberglass.

Structures are up to 15 times more airtight than stick-built walls with fiberglass insulation.