On the other hand, faced with the worldwide shortage of forest resources, the building industry is showing increasing interest in particleboard production from agricultural waste products [5]. Wheat straw has high fibre content showing good potential to replace wood in particleboard fabrication. Particleboard with a density range from 0.59 to 0.8 g/cm3 is designated as mediumdensity particleboard [6]. It has broad applications for both structural and nonstructural uses. Barley straw is another significant raw material used in cellulose production as an energy resource [7–12]. The thermal conductivity of straw bales ranged from 0.0414 to 0.0486 and 0.0353 to 0.0539W/mK for all straw bale densities at various temperatures for wheat and barley straw bales, respectively. The average thermal conductivity values and thermal resistances at both 20.7 ◦ C and 34.2 ◦ C were much higher than those of at 10.3 ◦ C. The thermal conductivity values and the thermal resistance values exhibit greater change as temperature changed from 10.3 to 20.7 ◦ C than those values when temperature changed from 20.7 to 34.2 ◦ C [13]. In [14], the thermal conductivity of wheat straw bales was measured and the thermal resistance was found to be 0.046 W/m K. A lightweight straw loam with a density of 750 kg/m3 had a แรมด้าvalue of 0.20 W/m K, whereas a lightweight expanded loam with a density of 740 kg/m3 had a แรมด้า-value of 0.18 W/m K. The spe- cific heat for the same material was 1.0 kJ/kg K [15].