← Glossary
Building elements

Closed panel

A closed panel is a prefabricated wall or roof element that leaves the factory boarded on both faces, with insulation and often windows, services and cladding fitted.

Also known as closed panels, closed wall panel, closed panel system, insulated wall panel, closed timber frame panel

Where an open panel is just a braced frame, a closed panel is close to a finished piece of building envelope. The frame is sheathed on the outside, insulated, fitted with a vapour barrier and boarded on the inside, and windows, doors, service runs and even cladding can be installed before delivery.

Closing panels moves the most weather-sensitive and labour-intensive work into the factory. The building is weathertight within days of erection, but the panel needs more factory capacity, careful design coordination and a tighter link between design data and production.

Related terms
Open panelAn open panel is a prefabricated wall frame that is sheathed on one side only, or not at all, leaving the cavities open for insulation and services on site. Wall panelA wall panel is a prefabricated section of wall: a timber or steel frame, often already fitted with sheathing, insulation, windows and services. It is built in a factory and assembled on site. Blown-in insulationBlown-in insulation is loose insulation material (cellulose, glass or stone wool) blown into a cavity until it fills it to a specified density. Building envelopeThe building envelope is the physical barrier between inside and outside: the external walls, roof, lowest floor, windows and doors.
From term to production line

Talk to Randek

Building this at scale? Tell us what you produce and we’ll point you to the right system.

Talk to your team Back to the glossary
Talk to your team