INSTRUCTIONS FOR ESTIMATING DEFECT 

 Minimum Merchantable Cruising Standards 



No green tree is to be considered to be a cull unless all logs in the 

 tree, cruised separately on their own merits, are culls based on minimum 

 Company scaling standards. 



Minimum standards for logs of the mixed species is 1/2 of its gross 

 volume must be merchantable; and for logs of the pine species, 1/3 of their 

 gross volume must be merchantable for lumber. Individual logs of dead trees 

 cruised for pulp content are considered merchantable if 50% of their gross 

 volume is free of rot. Thus a tree, either green or dead, may be given a 

 defect figure of 75% or even more if it has a log or two in it that barely 

 meets minimum standards. 



Dead Douglas-fir trees with few or no red needles, less than 22" DBH, 

 will often be complete culls. 



Sap-rotted trees - Reduce the diameter by 1/4 and the volume will be 

 reduced by 1/2. 



Minimum top diameters for white pine by DBH classes: 



DBH 



Top Dia. 



DBH 



Top Dia. 



DBH 



Top Dia. 



DBH 



Top Dia. 



12 



6 



24 



9 



36 



11 



48 



13 



14 



7 



26 



9 



38 



11 



50 



14 



16 



7 



28 



9 



40 



12 



52 



14 



18 



7 



30 



10 



42 



12 



54 



15 



20 



8 



32 



10 



44 



13 







22 



8 



34 



11 



46 



13 







18 



