Reduce heat loss by up to 50% while preventing mold growth and increasing thermal comfort where slab edges of concrete buildings penetrate the insulated building envelope.
Uninsulated slab edges penetrating insulated building envelopes act like heat sinks, creating a thermal bridge between the cold exterior slab edge and the warm interior floor slab, exposing the developer to short- and long-term problems including:
Conventional exposed slab edges create a thermal bridge in the otherwise continuous insulation of the building envelope, rapidly conducting heat away from the interior floor slab, through the envelope and into the exterior environment.
For decades, wasted heat was considered unavoidable in North American buildings with exposed slab edges.
Because these buildings also leaked air profusely, interior humidity levels equalized with low exterior humidity levels (typically 18 to 25%) during winter months. Forced hot air typically vented at or near cold slab edges further ensured that interior humidity remained too low to reach dew point, form condensation or support mold growth.
Modern buildings wrapped in airtight vapor barriers require less heat and retain more moisture from evaporation and human off-gassing, producing interior humidity levels of 35% to 50% (typical) during winter. While this humidity increase benefits energy efficiency and human comfort, it also allows the interior air to reach dew point, form condensation and support mold growth where cold floor slabs penetrate the interior side of the building envelope.
Mold can grow on the inside face of sheetrock, studs and insulation years before it becomes visible on interior ceilings and walls adjacent to slab edges, exposing the developer to remediation and liability costs.
A Schöck Isokorb® Structural Thermal Break is a fabricated assembly that is cast into the concrete floor slab at the location of the building insulation layer. The thermal break insulates the interior floor slab from the exterior exposed slab edge while transferring the loads imposed on the exposed slab edge back to the interior floor slab.
Thermal breaks for concrete-to-concrete slab edges are engineered with rebar for casting into floor slabs on the interior of the building envelope, and into slab edges that penetrate the envelope.