Abstract
The objective of this study is to evaluate the effect of the species on the biological resistance of wood against decay and to propose corrective values of the critical dose. To evaluate the species effect, the evolution of the number of days per year with moisture content exceeding 18% was assessed in flat sawn 20x100x750 mm3 test samples of Laricio, Scots and Radiata pines and also of Norway spruce, Eucalypt (globulus) and sweet chestnut during the years 2016, 2017 and 2018, exposed at seven locations in Spain with the most representative Spanish climates. A value of 1.0 is proposed for the four conifers, 2.51 for the Eucalypt and 1.84 for the Sweet chestnut. As regards the species effect it was not possible to separate that corresponding to the different wetting/releasing ability of each species and that of their crack susceptibility, both aspects having to be evaluated together as “species factor”.
Highlights
The objective of this study is to evaluate the effect of the species on the biological resistance of wood against decay and to propose corrective values of the critical dose
On-site wood decay is the result of a series of concomitant factors which make up the so-called “material climate”, which in turn has a direct impact on the service life of the wood products and constructions [3]
These guidelines are based on a limit state described as "onset of decay", defined as a state of fungal attack according to rating 1 in EN 252 [7], which corresponds to a slight attack which is described in the standard as the situation when perceptible surface changes are apparent, but very limited in their intensity and their position or distribution, with softening of the wood being the most common symptom
Summary
The objective of this study is to evaluate the effect of the species on the biological resistance of wood against decay and to propose corrective values of the critical dose. Different works at European level [4,5,6] have proposed new technical guidelines for the design of buildings constructed using timber with respect to durability and service life, based on a parametric system similar to that used in mechanical engineering These guidelines are based on a limit state described as "onset of decay", defined as a state of fungal attack according to rating 1 in EN 252 [7], which corresponds to a slight attack which is described in the standard as the situation when perceptible surface changes are apparent, but very limited in their intensity and their position or distribution, with softening of the wood being the most common symptom
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