I have received a quote for roof paneling that states it is Pine class III. I have tried googling to understand wood species and their classes. Does anyone have a good reference or can simply describe the different classes?
Class and sort function similarly and are available from class 1-6. In short, Class 1 wood is of the best quality (visually inspected) with the least number and distribution of:
knots
compression wood
cracks
resin wood
wane
ropey wood
resin pockets
fungal attacks
bark distortion
deformation
sweep
insect damage
grain slant
discoloration
top breakage
handling damage
reaction wood
dimensional deviations
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