Water Permeability of Exterior Wood Coatings: Waterborne Acrylate Dispersions for Windows

Hýsek, Štěpán; Fidan, Hakan; Pánek, Miloš; Böhm, Martin; Trgala, Kamil

doi:10.3992/1943-4618.13.3.1

Cited by 13 publications

(8 citation statements)

References 29 publications

(34 reference statements)

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“…This permeability of water vapor is a crucial property also affecting the performance of wood finishes [14]. However, vapor permeability (the rate of flow of water vapor through the substrate and through the substrate plus coating) may in some coating types be larger toward the wood than back out through the coating, leading to water condensing beneath the cladding [15,16]. This may be a problem especially if coupled with insufficient ventilation.…”

Section: Introductionmentioning

confidence: 99%

Moisture Sorption of Wood Surfaces Modified by One-Sided Carbonization as an Alternative to Traditional Façade Coatings

2022

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Surface carbonization, or charring, of wooden cladding boards is a promising, low impact process that can substitute inorganic coatings. The char surface is inert and hydrophobic and possibly a long-lasting solution for exterior uses. To determine the performance of surface-charred wood, several sorption experiments were established. Sapwood of two hardwoods (aspen, birch) and two softwoods (pine, spruce) were used as the experimental material, modified by contact charring and gas flame charring, including surfaces coated with oil for further protection. The results showed that flame charring modification is equal to a double layer of acrylic paint on primer in terms of permeability on all wood species, with higher moisture exclusion efficiency at high relative humidity. Contact charring modification presented much improved properties in comparison to both flame charring and acrylic paint in all implemented sorption experiments, but the dimensional stability was poor with strong cupping in wetting. However, hardwoods and especially birch exhibited less dimensional distortion than the other investigated species, and oiling further reduced the cupping. The contact charring modification produced more repeatable results with less impact from substrate and all wood species benefitted, whereas the flame charring modification is more dependent on inherent properties of the wood species, and does not seem to suit aspen as well as birch, and pine as well as spruce, although oiling affected the observed results.

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Section: Introductionmentioning

confidence: 99%

Moisture Sorption of Wood Surfaces Modified by One-Sided Carbonization as an Alternative to Traditional Façade Coatings

2022

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“…Paint systems are used to protect wood surfaces against the aforementioned 'complex of abiotic and biotic influences' [11]. The protective function of wood coatings is defined by their thickness [12], water and vapour permeability [13,14], hydrophobicity [15] or adhesion [16]. The aesthetic function is mainly determined by colour consistency [11], gloss [17] and the ability to prevent mould growth [18].…”

Section: Introductionmentioning

confidence: 99%

Durability of Selected Transparent and Semi-Transparent Coatings on Siberian and European Larch during Artificial Weathering

et al. 2019

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This paper compares the resistance of 20 commercial transparent and semi-transparent coatings applied to European and Siberian larch during artificial weathering in Xenotest. The change in gloss, colour, contact angle of wetting, resistance to Aspergillus niger and Penicillium brevicompactum moulds was evaluated, and visual changes at the top surface of treated wood species were measured. Overall, the durability of coatings on European larch was higher than that on Siberian larch. The most durable of the tested coatings was a thin-film, i.e., semi-transparent oil-based film containing TiO2 pigment and propiconazole fungicide. Of the transparent coatings, the most stable was a thick acrylic coating. Conversely, penetrating transparent oil systems had low colour stability and overall lifespan. Artificial weathering of all of the coatings resulted in a marked decrease in their resistance to moulds.

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“…On the other hand, acrylic (latex) paints have good extensibility that allows them to withstand repetitive dimensional changes [ 5 ]. The downside is that they have high vapor permeability but release the penetrated moisture slowly [ 3 , 6 ]. This may lead to trapping of moisture, peeling of the coating layer and biodeterioration if sufficient ventilation is not considered.…”

Section: Introductionmentioning

confidence: 99%

Artificial Weathering of Contact-Charred Wood—The Effect of Modification Duration, Wood Species and Material Density

et al. 2022

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A relevant issue with charred exteriors is the inconsistency of the result, which makes service life predictions complicated. Contact charring enables the creation of a very evenly modified surface with accurate control of temperature and modification time, but the weathering properties are questionable. This paper evaluated the effect of the modification time relative to char layer and transition zone thickness, wood species and material density in an artificial weathering test. The results revealed higher color stability in connection to longer modification time, but also an increase in the cracked surface area. Cracking was heavily dependent on the modification regime and increased with increasing char and transition zone thicknesses. Dense spruce had the highest color stability with the most severe modification regime, but char layer thickness varied more than on other wood types. Furthermore, species-dependent cracking patterns affected the final result as the small-scale flaking experienced by birch increased the washing off of char. It is likely an even higher modification temperature with a shorter modification time is needed to produce sufficient weathering resistance suitable for exterior uses.

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Water Permeability of Exterior Wood Coatings: Waterborne Acrylate Dispersions for Windows

Cited by 13 publications

References 29 publications

Moisture Sorption of Wood Surfaces Modified by One-Sided Carbonization as an Alternative to Traditional Façade Coatings

Moisture Sorption of Wood Surfaces Modified by One-Sided Carbonization as an Alternative to Traditional Façade Coatings

Durability of Selected Transparent and Semi-Transparent Coatings on Siberian and European Larch during Artificial Weathering

Artificial Weathering of Contact-Charred Wood—The Effect of Modification Duration, Wood Species and Material Density

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