External wooden constructions have own place in building industry from ages. The external wooden construction easily degrade due to UV radiation, atmospheric condition and biological aggressors. Solution of this weakness could be photocatalytic materials. Those materials are efficient UV absorbers and they are able to destroy biological aggressors also. Nowadays, there is no information about the interactions between wooden surface and non-photoactive or photoactive form of TiO2. This material will be applied on wooden surface for creating a transparent layer of TiO2. TiO2 exists in many morphological forms. The planar particles will be chosen for purpose of the project. They can be prepared as non-photoactive and photoactive. Obtained data will be used for new evaluation method of influence photocatalytic materials on wooden surface.