We have an unheated porch which used to get very cold in the winter. It suffered terribly from mould and condensation. In 2023, Mat from District Damp & WaterProofing, removed the old ceiling, added new insulation, filled all the gaps, replaced the ceiling and re-plastered, all in one day. This was a massive improvement. In June 2024, Mat alerted us to a new product called ISOtherm board. Mat was able to fix the new board to the inside of the exterior walls of the porch, and he re-plastered, all in two days, with minimal inconvenience. So far, in the winter of 2024/25, we have had no damp or mould at all. The problem has been completely solved. An excellent job all round, and it has made a huge difference to us.