Fig. 1From: The influence of heartwood, sapwood and density on moisture fluctuations and crack formations of coated Norway spruce in outdoor exposurea MC fluctuation for samples with the film-forming coatings (average of A, B and C) and the non-film-forming coating (D). The error bars represent the standard deviation of the values. b Relative humidity (RH), temperature and precipitation. A–D: coating systems described in Table 2Back to article page