By applying permeable insulating plaster in combination with calcium-silicate panels at the inside of the walls, there will be no need for any costs-intensive outside insulation which anyhow are often not allowed for installation at many buildings due to constructional reasons. This method of inside insulation is particularly optimized by means of a layer of up to 4cm (permeable) insulating plaster which will be affixed to the inside of the outside walls and becomes extremely effective in combination with the calcium-silicate panels and the capillary tube mats. This is especially suitable for monument- listed buildings where an external thermal insulation system is an absolute no-go. On top of that, the insulation plaster serves the purpose to even out the rough surfaces of for example rubble masonry.

In addition, neither the permeable insulating plaster nor the calcium-silicate panel is inflammable. Quite to the opposite, calcium-silicate has – in addition to its hygroscopic attitude – the property of extreme heat resistance and is thus being used for the lining of furnaces and open fire places. A fire catastrophe like the Grenfell Tower in London is therefore by all means excluded. Accordingly and in view of its heat resistance, calcium-silicate does not need any chemical additives like Polystyrol-products for reducing inflammability.