Paint all the pieces of tiling batten with the outdoor wooden paint, then allow them to dry.
Place the two pieces of 5-foot-long tiling batten on a flat surface, parallel to each other and 3 feet apart. These will be the top support and the bottom support of the trellis.
Take the first piece of angled tiling batten and place it so that the tip on one end is in line with the upper-left tip of the top support, and so that the two angled edges are even with the outer edges of the supports.
Staple the ends of the first trellis line to the supports.
Place the spacing block so that it sits flat against the right side of the first trellis line.
Place the next angled tiling batten so that it sits against the spacing block and so that the two angled ends are even with the outer edges of the supports.
Staple the second trellis line into place.
Repeat steps five to seven until 11 trellis lines have been laid parallel to each other.
Saw off the parts of the trellis lines that extend beyond the right ends of the supports.
Staple these cut-off parts to the bottom support, in the area on the left that was initially missed, by starting on the top support. Ensure you use the spacing block to ensure they are spaced and angled properly.
Place the second layer of trellis lines so that they are perpendicular to the first layer, creating a crisscross pattern, with the ends placed even with the ends of the first layer.
Staple every intersection where the two trellis line layers cross.