10. Material Group Reference
10.1 Common Names of Timbers (BS888/589:1973) with group nos.
Group 1 ~ 8 for timbers
Group 9 for plywood, drywall, and oriented strand board (OSB)
Group 10 for brick, cement screed, and concrete
Group 11 for cement mortar, anhydrite screed, lime mortar, and plaster
Group 10 and 11 are not specified for accuracy and should be used for reference only