2562 



Chapter 22 



Table 22-4 — Capital depreciation associated with extracting, manufacturing, and trans- 

 porting to building site — selected primary commodities (Boyd et al. 1977)' 



Commodities 



Extraction Manufacturing Transport Total 



Wood-based commodities 



Softwood lumber 



Structural flakeboard 



Lumber laminated from veneer 

 Softwood sheathing plywood. . 

 Underlayment particleboard ... 



Hardwood plywood 



Insulation board 



Oak flooring 



Medium-density 



fiberboard 



Wet-formed hardboard 



Total 



Percent of total 



Mean 



Nonwood-based commodities 



Gravel 



Concrete slab 



Concrete block 



Clay brick 



Liquid asphalt 



Gypsum board 



Tar paper 



Asphalt shingles 



Steel nails 



Steel studs 



Steel joists : 



Glass fiber 



Vermiculite 



Aluminum siding 



Carpet and pad 



Plastic vapor barrier 



Total 



Percent of total 



Mean 



• 1972 basis. 



