Heat and humidity performance of EPS and Rock wool board external thermal insulation system

Abstract

A coupled heat and humidity transfer model of external thermal insulation wall is established, and the accuracy of the model is verified by the field test data. Taking Shanghai, a typical hot summer and cold winter area, as an example, this paper simulated and analysed the effects of different climatic conditions (winter and summer) and types of insulation board (rock wool and EPS) on the thermal and humidity properties of concrete-mortar-insulation-mortar external insulation wall. The results show that the temperature variation of the bonding mortar on the inside of the insulation board is much smaller than that on the outside of the insulation board due to the thermal insulation effect; the relative humidity of the bonding mortar layer in the external insulation system of rock wool can reach more than 80% within 7 days in summer, which has a high risk of falling off; and the relative humidity of the coating mortar layer can reach about 73% within 7 days in winter, which is likely to become mildewed; The resistance to moisture migration of rock wool is weaker than that of EPS.