South East London has one of the highest concentrations of pre-1920s solid-wall Victorian and Edwardian terraces of any area in England. These properties — in Greenwich, Lewisham, Peckham, Deptford, Bermondsey and beyond — were built before cavity wall construction became standard. They have no insulation layer in their walls and lose heat at a rate that modern buildings simply do not.

ThermoSilicone external render and ProofTherm internal plaster are designed precisely for this type of construction. By applying an insulating layer to the wall face — externally or internally — we create a thermal barrier that reduces heat loss, lowers bills, and makes rooms that have always been cold genuinely comfortable.