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This paper presents the application of the Darcy and Richards equations, describing
water flow and dynamic changes of the water content in porous medium, for numerical modeling
of water capillary rise in the selected building materials. The numerical simulations of
unsaturated and variably saturated water flow in the studied materials were performed in
FEFLOW commercial computational software, by DHI-Wasy, Germany. The developed model
represented a wall section constructed of aerated concrete blocks, covered by mortar prepared
using blended cement with biomass ash addition. The physical and water retention characteristics
of the modeled materials were based on the previously performed laboratory measurements and
literature research. The assumed initial conditions reflected air dry wall with limited moisture,
while the boundary conditions allowed modeling of capillary rise due to direct contact of the
studied materials with water with variable pressure head. The results of numerical calculations
allowed observation of the time-dependent changes in the moisture content of building materials
in relation to their physical properties and variable boundary conditions.
