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Title: Volume Recovery, Grade Yield, and Properties of Lumber From Young-Growth Sitka Spruce and Western Hemlock in Southeast Alaska

Source: Forest Prod. J. 52(5):81-87.

Author(s)Christensen, Julin, Ross, Willits

Publication Year: 2002  View PDF »

Category: Journal Articles

Abstract: Wood volume recovery, lumber grade yield, and mechanical properties ofyoung-growth Sitka spruce (Picea sitchensis (Bong.) Carr.) and western hemlock (Tsuga heterophyla (Raf.) Sarg.)were examined. The sample includedtrees from commerciallythinned and unthinned stands and fluted western hemlock logs obtained from a sort yard. Mean cubic recovery of lumber volume from all sawn logs was 44.9 percent. More than 90 percent of the lumberwas graded asNo. 2 orbetter; about 5 percent was Clear (C-Select or D-Select),and about 10percent was SelectStructural.No differencesin volume recovery or gradeyield due to thinning were noted for Sitkasprucelogs. Forwesternhemlock,morevolumewasrecoveredfromtreesin unthinnedstands;more Select Structuraland No. 1 lumber and less No. 2 lumber was produced from thinned stands. No differences in volume recovery or grade yield were noted be-tween fluted andunthinnedwestern hemlock.Bendingpropertieswere foundto be excellentfor this resource.All gradesfor both species exceeded or matched published bending modulus of elasticity (MOE) values for these species. No differences in MOE were noted between thinned and unthinned lumber from both species. Slightly higher MOE values were noted in fluted western hemlock for the No. 1 and No. 2 lumber grades. Lumber from this young-growth resource appears best suited for structural light framing or molding and millwork, based on visual grading rules and mechanical properties observed.

File size: 285 kb(s)

Date posted: 04/05/2010
Current FPL Scientist associated with this product
Ross, Robert J.
Supervisory Research Gen. Engineer
  

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