Air barrier systems in commercial buildings in cold climate zones are designed and constructed to control air and vapor transmission between a conditioned space and an unconditioned space. The air barrier system is the primary air boundary that separates indoor (conditioned) air and outdoor (unconditioned) air.
Shoring walls are temporary retaining structures that prevent soil movement and cave-ins during a construction site excavation. These systems are used to minimize the excavation area, to keep the sides of deep excavations stable, and to ensure that movements will not cause damage to existing adjacent structures or to utilities in the surrounding ground.
Curtain wall and storefront glazing systems are typically a thin, non-structural outer façade element of a building that can span multiple floors or be incorporated into a punched opening. Glazing systems function largely as air and water vapor barriers, resisting air or water infiltration and accommodate building and system movement induced by wind, thermal, and seismic forces.