Torrefied Douglas Fir Can Sand Into Ridges Douglas Fir growth rings contain relatively soft earlywood beside much denser latewood. Torrefaction changes the wood’s color and moisture response but preserves this contrast, so aggressive sanding can remove the earlywood faster and leave the latewood standing slightly proud. Practical takeaway: Establish the final surface with a sharp cutting tool. When sanding, use light pressure, moderate speed and a firm backing pad that bridges the contrasting growth-ring bands instead of following every softer area.
