This paper deals with the wood durability when applied in the building façades and outdoor subject to aggressive environmental agents and its means of protection. This study is justified since wood outdoors is na important part of the built heritage that needs to be preserved. The aim of this work was to obtain the relationship between the performance of wood surface protection products and different service situations. It was evaluated its coating ability to the environmental aggressions, simulating an application above ground and exposed to the weather (use class 3.2 - EN 335-2:2013) and to the attack by fungi simulating an application in direct contact with soil (use class 4.1). The long-term goal of this work is to contribute for the creation of a results network making easier for the user to protect wood from external aggression. Four different environmental conditions were chosen: next to the coast (saline); urban centre (pollution); interior of the country (high thermal amplitude); soil contact (fungi and moulds) and building interiors (control). Three commercial water based products were chosen due to its characteristics: WRN - water resistance assured by nanotechnology; WAC – weatherproof acrylic copolymer; ART - acrylic resins with Teflon®. This work showed that the most aggressive environment was the one with high thermal amplitudes. Comparing the performance of tested products: WRN exhibits the lowest protection levels, only antifungal function was comparable to the other products, in this formulation instead of sealing the pores, nanoparticles "dress them", assuring that water is effectively repelled by chemical forces; WAC and ART were very similar since both form a protective film increasing the surface resistance; ART presents the best performance with respect to coating integrity with very positive influence against the development of cracks.