Sixteen dried sawn-timber (10.5 x 10.5 x 360 cm) were cut into half. The half of them was treated by step-wise pressure process with 2.5 MPa maximum, and the other half was treated by conventional pressure process with 2.5 MPa maximum. Average DDAC preservative absorption was 461 kg/m3 in the former and 525 kg/m3 in the later. Surface roughness was expressed as the profile element height of collapse on the surface of treated timber. The maximum profile element height was 1.10 mm in the former and 3.10 mm in the later. The average value height ranged between 0.35 mm and 0.58 mm in the specimens by conventional process, and 0.19-0.24 mm in those by step-wise process. Step-wise pressure treatment reduced the surface roughness but also reduced preservative absorption.

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