A damp wall is a cold wall. A cold wall attracts condensation. Condensation attracts mould. Your damp-wall and/or cold wall is certainly costing you money, it could be also costing you your health.
Your wall may be cold for a variety of reasons. Single skin and solid walls are unsuitable for cavity wall insulation and so the exterior wall of the property is significantly cooled by cold outside temperatures. Solid walls are also more susceptible to penetrating dampness from wind-driven rain. A damp wall is much less thermally efficient than dry wall, and even insulated walls will become thermally inefficient if the moisture makes the insulation damp also.
Single skin or solid walls
Transfer of cold temperatures to internal surfaces
Wind driven rain
Wet or damp walls or thermally inefficient resulting in cold internal surfaces
Wind driven rain
Dampening of cavity wall insulation resulting in thermally inefficient insulation
Cold internal walls due to thermally inefficient walls and /or insulation
Surface condensation is damaging, unsightly and is a contributory factor for the growth of moulds to internal surfaces.
Keeping the wall dry
Newton 807 BKK eco is a transparent colourless wall coating, water siloxane based, ideal to protect porous walls of various substrates from wind driven rain. After treatment, the wall is deeply impervious to water ingress and so better protected against frost damage. The treated wall will continue to dry and vapour drive is not effected due to the coating being very vapour permeable.
The resultant dry wall is much more thermally efficient and will save on heating bills also. Having a low molecular weight, Newton 807 BKK eco penetrates deeply into the substrate creating an invisible deep layer of protection that is extremely stable to lime and very permeable to water vapour.
Increasing the surface temperature of internal wall surfaces
Newton 806 CWC is a white thermal coating for cold and poorly insulated surfaces. It contains specific mineral powders which thanks to their insulating features, warm the surface of the treated wall.
Condensation is formed when warm air, holding water vapour, comes into contact with a cold surface (dew point surface). The air near to the cold surface cools and the cooler air is unable to hold as much water vapour as it was able to when it was warmer. The water vapour that the cooler air is unable to hold is deposited on the adjacent cool surface. The 5oC difference between a surface treated with CWC and one not treated with CWC will in most cases take the wall surface temperature to above the dew-point, which means that the formation of condensation and mould is eliminated.
Treatment with Newton 806 CWC and Newton 807 BKK eco results in exterior walls that are drier and much more thermally efficient. The difference to the internal habitable environment will be very noticeable and the occurrence of surface moulds will be considerably reduced. As well as being more thermally efficient, the exterior walls will be less susceptible to frost damage and the pointing within mortar walls will last longer also.