Biofouling resistance of titanium dioxide and zinc oxide nanoparticulate silane/siloxane exterior facade treatments

► TiO2 and ZnO nano-particulate enhanced water repellent facade treatments. ► Algae culture streaming study assessed biofouling of mortar. ► Bioreceptivity mechanisms assessed independently. ► Improved water beading and sorptivity. ► <0.1%wt nano-particulate incorporation achieved photo-induced sanitisation.