Abstract: Most durability problems of concrete structures are related to moisture (water) transport in concrete. A complete model of moisture transport consists of the differential equations, corresponding boundary and initial conditions. In this paper, the moisture transport processes in the concrete and environment were investigated and approximate calculations were carried out using the boundary layer theory. Experiments were carried out to investigate the relative humidity and temperature distribution and evolution in the near-surface region. The one-dimensional ‘concrete- environment’ coupled problem was solved by finite element method, and the influence of the surface factor was discussed numerically. Based on the obtained results, some recommendations on the selection of the boundary condition were given.