Mortice Fence using Larch Posts with Post head – May 2015 by csmills | Jun 24, 2015 | Testimonials Mortice Fence Mortice Fence Mortice Fence using 1.8m x 150mm x 150mm Douglas Fir/Larch Posts and 4.8m x 150mm x 44mm rails. All pressure treated and PAO. Customer stained fence after being fitted. Post centres 2.4m. Height to top of post is 1.2m