Investigation into the Variations of Moisture Content of Two Buildings Constructed with Light Earth Walls

This paper briefly describes the background to light earth buildings and details a series of moisture measurements undertaken upon the clay and straw (light earth) constructed walls of two U.K.-based buildings. The methodology of measurement that was based upon previous studies undertaken on walls made from straw bales is described. A novel “in-wall” wet heating system used in one of the two buildings allows the investigation of the effects of direct wall heating upon the distribution of moisture in the walls. The influence of exterior and interior temperature and humidity are described as are the variations in moisture migration introduced by the in-wall heating system. It was concluded that both buildings have exterior wall moisture content readings that indicate little risk of degradation due to interior wall moisture levels (although the Studio walls do exhibit higher and if suffered over long time periods, dangerous moisture readings for part of the measurement period).