The U.S. Department of Energy estimates that 42 percent of energy consumed in a building is ultimately lost through the building envelope, or the barrier between the building interior and outdoor environment. The building envelope is critical in regulating internal building temperatures and determining how much energy is required to heat or cool a structure for the heat transfer through envelope components, such as walls, wastes energy.
Mid-States CarbonCast® technology provides high performance insulated wall panels that not only deliver all of the benefits of factory precasting, but provide an unprecedented thermal efficiency by mitigating heat transfer and energy loss. CarbonCast® precast wall panels are engineered to minimize the opportunities for heat to flow from the interior surface through the wall to the building’s exterior.
How CarbonCast® Precast Insulated Wall Panels Work
CarbonCast® High Performance Insulated Wall Panels are composed of two concrete wythes separated by continuous insulation (ci), and connected by C-GRID® shear trusses. With low thermal conductivity, high strength C-GRID helps deliver a panel with insulation values that can meet and exceed ASHRAE 90.1requirements-depending on the thickness and type of foam insulation. Extensive research has unequivocally proven the outstanding load-bearing performance of CarbonCast High Performance Insulated Wall Panels. The C-GRID shear trusses patented pilasters render a panel with full structurally composite action and improved durability.
The role of wythe connectors
In insulated precast concrete wall panels, wythe connectors act as a mechanical connection between the inner and outer layers of concrete. Because they form a connection through the insulation, there is an opportunity for thermal bridging to occur as well. Traditional wythe connection options such as solid zones of concrete or metal connectors-while providing a reliable mechanical connection-permit heat transfer between the wall because of the materials inherent conductivity. What is important is designing a performance specification on the overall wall system rather than just the connector alone. A specification based on the overall wall system is one of the best ways of ensuring that the enclosure will meet the owners’ standards.
The role of insulation
Insulation helps to prevent the flow of heat across the exterior envelope. The use of continuous insulation further stems the flow by eliminating the presence of building materials that could facilitate thermal transfer. Continuous insulation is defined in ASHRAE 90.1 as “insulation that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope.” The thermal performance of edge-to-edge insulated precast sandwich wall panels with no or minimal thermal bridges and no solid zones maintains the R-values for continuous insulation as defined by ASHRAE 90.1, thereby lowering energy costs for the owner and occupant.