Ceiling

A ceiling /ˈsiːlɪŋ/ is an overhead interior roof that covers the upper limits of a room.

Pipework or ducts can be run in the gap above the ceiling, and insulation and fireproofing material can be placed here.

This makes it relatively easy to repair the pipes and insulation behind the ceiling, since all that is necessary is to lift off the cardboard, rather than digging through the drywall and then replacing it.

A dropped ceiling is one in which the finished surface is constructed anywhere from a few inches or centimeters to several feet or a few meters below the structure above it.

[2] Ceilings have frequently been decorated with fresco painting, mosaic tiles and other surface treatments.

While hard to execute (at least in place) a decorated ceiling has the advantage that it is largely protected from damage by fingers and dust.