Stackwall® is an exclusive structural wall system comprised of facade glass panels joined to vertical glass mullions with metal patch or “spider” fittings. Vertical glass mullions are designed to resist site specific design loads. An engineered floor-loaded or suspended structural wall system, for heights up to 50′, that uses tempered glass mullions to resist site specific design loads. The main plates are joined to the mullions (fins) with metal patch or “spider” fittings and structural silicone. Structural fastening surfaces are required at the perimeter. All-Glass Doors Oldcastle BuildingEnvelope® can incorporate all-glass entrance systems into our Stackwall® systems. Door types and configurations may vary.