When building- a brick wall, it is vital that bricks are laid both level horizontally and evenly vertically. Start laying- the courses by building both ends up first and then infilling-. During the first stage, regularly check that the vertical alignment is exact by holding a spirit level against the bricks, or. If the wall is too high for this to be accurate, use a plumb line.
When infilling, use two L-shaped corner blocks and a line to check the horizontal alignment. To make each block, screw two small 50 mm 2 in cubes of softwood on to one side of a larger block of the same thickness, leaving a gap between the two smaller blocks.