Improving Thermal Efficiency of External Walls

Cold Walls Cause Condensation

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 within the walls makes the insulation damp also.

Solution 1 – Keeping The Wall Dry

  • Newton 807 BKK eco is a colourless wall coating, water siloxane based, that protects 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 due to the coating being very vapour permeable.

    The resultant dry wall is much more thermally efficient, which as well as reducing the incidence of internal condensation, will save on heating bills also. Newton 807 BKK eco penetrates deeply into the substrate, creating an invisible deep layer of protection against water ingress but allowing the wall to continue to dry out.

    Newton 807 BKK eco
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Solution 2 – 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 5°C difference between a surface treated with Newton 806 CWC and one not treated 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 and thermal efficiency is greatly improved.

    Newton 806 CWC
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Result

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.