When masonry gets wet it loses its insulation properties, much in the same way that wet clothes make you feel cold. By creating a deep water-repellent zone on the masonry surface, energy efficient wall coating ensures that the masonry remains dry throughout the year – maximising its thermal resistance or “R” value. Our energy efficient coating has been verified by The Energy Saving Trust.
If you have water in your wall, then the wall is no longer an insulator but a thermal conductor, actively carrying heat out of your home through the walls. This is quite apart from the damage and mould that is building up on the inside of your house. To prevent further damage and energy loss, you urgently need to identify where the water is getting in and stop it.
The cause of the water is probably rainwater penetrating the outer skin. Unless a wall is waterproofed, the weather will be penetrating the outside leaf saturating any insulation, which could then bridge the cavity and cause damp in the inside of your home.
In order to prove the concept of improving the thermal resistance of walls using energy efficient wall coating a preliminary test was carried out at the University of Portsmouth comparing the thermal resistance (R-value) of a wet brick with that of a coated brick. This test demonstrated that the thermal resistance of the energy efficient coated brick was more than twice that of the wet brick. In order to estimate the thermal benefits of treating walls with in the real world further testing and modelling was carried out:
Further testing carried out by the University of Portsmouth involved the comparative testing of a treated and untreated model house placed in an environmental chamber. During the experiment, the energy required to maintain a stable 20ºC temperature within the model test house was measured. Energy savings of between 5 and 9% were demonstrated in a single brick width wall from the result of changing outside temperature and humidity alone, indicating that energy savings are possible even during periods of no rainfall. A 50% energy saving was demonstrated during a single wet “rain” event. Sure Guard Protection Ltd stress that it is impossible to calculate the energy saving of any particular house and so therefore do not do so.