<p>The insulation board (I) has a board portion that is made of hard and non stretchable material such as stainless steel. The shafts are extended along the longitudinal axis in the driving direction. The front edge (1) of the board portion is wedge-shaped at driving face of the masonry. The two edges (2) of the adjacent board portion are turned to the front edge when driving the masonry. The guide elements are arranged to produce a force component in the direction to the concave sides of the respective shafts of board portion. An independent claim is included for method for manufacturing insulation board.</p>
