Solid Wall

Solid Walls commonly support the superstructure of a building and may be differentiated from Cavity Walls.

Older, pre-20th Century properties tend to be constructed entirely with Solid Walls built from brick or stone, with wall thickness generally determined by the building height.

In general, Solid Wall-built structures can be more costly to heat, and are more wasteful of energy, as a Cavity Wall may be more  easily insulated. Even without installed insulation, the space between the two sides of a Cavity Wall acts as a thermal break reducing the conduction of heat, which a Solid Wall lacks.