Hydrophobising internally insulated walls is becoming increasingly popular as a way to reduce the risk at moisture problems by limiting the amount of absorbed wind-driven rain. Despite many promising studies on water repellent agents, several faulty applications, possibly attributed to cracks in the masonry wall or a mismatch between facade building material and water repellent agent, have been documented. When such a water repellent agent is applied on a building material, it should penetrate its pore network and render the pore walls hydrophobic. Relative to the size of the polymer chains of the agent, smaller pore bodies and/or throats might not get treated, causing them to remain hydrophilic. When too many pores remain hydrophilic, fast liquid water transport in the material can be induced, which hence renders the hydrophobisation application ineffective. This paper investigates the impact of these hydrophilic pore bodies and throats on the moisture behaviour in hydrophobised materials by simulating their hygric properties with a hygric property simulator and using these hygric properties to replicate the capillary absorption experiment with hygrothermal simulations. It is found that the capillary absorption coefficient increases gradually when more hydrophilic elements remain in the material’s pore network. Additionally, when these hydrophilic elements are scattered over the pore network and not directly connected to each other, the discontinuous liquid water flow still assures large reductions of the capillary absorption coefficient.