Buildings 2025 , 15 , 1702
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3.4. Thermal Properties The OSB-GA samples showed the same behavior as the OSB control sample in terms of thermal conductivity properties in both flatwise and edgewise positions. The results are presented in Table 5.
Table5. Thermal conductivity results in the flatwise and edgewise positions of the OSB samples.
Thermal Conductivity λ (W/m · K)
Requirement UNE-EN 13986
OSB Sample ID
Position
Mean 0.161 a 0.140 a 0.165 a 0.145 a 0.159 a 0.149 a
St. Dev.
Flatwise Edgewise Flatwise Edgewise Flatwise Edgewise
0.017 0.018 0.015 0.017 0.068 0.009
0.1644 0.1644 0.1410 0.1410 0.1496
OSB-C
OSB-1
OSB-2
0.1496 a corresponds to the only homogeneous group from a multiple range test, through the method 95% LSD.
The thermal property results of the different samples in the flatwise position were in the range of 0.159 W/m · K (OSB-2) to 0.165 W/m · K (OSB-1), where the OSB-2 sample reached 98.76% of the thermal conductivity obtained by the control sample OSB-C, while the OSB-1 sample outperformed the control sample by 2.48%. On the other hand, in the edgewise position, the results were in the range of 0.140 W/m · K (OSB-C) to 0.149 W/m · K (OSB-2), where the OSB-1 and OSB-2 samples outperformed the control sample by 3.57% and 6.43%, respectively. The results showed that the OSB-GA samples exhibited the same thermal insulation performance as the OSB control sample in terms of thermal conductivity in both flatwise and edgewise positions. This could indicate that the different adhesives used do not influence the thermal conductivity results of the OSB panels, but rather the wood species used. The thesis of Acuña-Alegría [46] explains that thermal conductivity depends on the density and moisture content of the wood. This author tested radiata pine wood species and obtained a thermal conductivity of approximately 0.18 W/m · K for a moisture content in the range of 2–5%, which is consistent with the results obtained. These results are also consistent with the thermal insulation requirements of the standard UNE-EN 13986 [33] (Table 5). 3.5. Evaluation of Formaldehyde Emissions The formaldehyde emissions of the OSB samples were evaluated at 2 h and 7 days. These results are presented in Table 6.
Table6. Results of the formaldehyde emission evaluation of the OSB samples.
Formaldehyde Emissions (ppm) 2h 7Days
OSB Sample ID
OSB-C OSB-1 OSB-2
0.011 0.013 0.009
0.005 0.007 0.006
The evaluation of the formaldehyde emissions of the OSB samples revealed that the samples presented similar results. In the case of 2 h of exposure, the OSB-2 sample emitted the lowest amount of formaldehyde (0.009 ppm), while the OSB-1 sample emitted the highest amount (0.013 ppm); however, the difference between the samples is not significant. On the other hand, in the case of formaldehyde emissions at 7 days, the OSB-C sample
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