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In this work, cement plastered straw bale specimens of sorghum and maize straw bale were tested for thermal conductivity using Lee’s disc apparatus. The thermal resistivity of the plastered straw bale specimens was evaluated as the reciprocal of the apparent thermal conductivity. The results of the experiment tests and calculations have shown that increase in the thickness of the plastered straw bale masonry would increase their thermal resistivity. Though this effect varies slightly from sorghum to maize straw bale masonry, but at the thickness of 400 mm. The thermal resistivity of wood specimens measured with the same apparatus agreed to within 1.21 of the published values.