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Scribner Vs. Cubic for Valuing Logs Is There a Clear Choice?

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Scribner Vs. Cubic for Valuing Logs Is There a Clear Choice? Scribner vs. Cubic for Valuing Logs Is there a clear choice? Neal Hart, Jendro & Hart, LLC Timber Measurement Society Meeting, April 2019 Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 1. Lumber Output to Log Input in Scribner & Cubic Log Scales 2. Return to Log Value $/Cunit: Lumber Output Scribner & Cubic Log Scales 3. Impact of Defect Deductions on Lumber Recovery Ratios & RTL Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 226 Test Logs • Length: 16’ • Diameter: 6” – 24” SED • Taper/16’: 1” – 4”, Ave 1.7” • Defect: Scribner 10% Cubic 7% Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Number of Test Logs by Dia Class 25 20 15 10 5 0 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20+ Small Log Line Large Log Line Mfg Cost $/mbf lbr: 6”-8” $130.64 12”-15” $121.38 9”-11” $108.85 16”- 24” $120.89 Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 • ID number for each log Measured: Scribner board feet log scale Cubic feet product scale • Lumber tallied log by log Measured: Board feet lumber scale Cubic feet solid wood (finished) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Arden Log Test - Lumber Products and Average Selling Values Grade 1 x 4 1 x 6 1 x 8 1 x 12 2 x 4 2 x 6 2 x 8 2 x 10 2 x 12 #1 Dim 216 217 285 305 #2 Dim 216 217 285 305 #3 Dim 119 Lamstock 276 302 307 Stud Grade 118 115 STD & BTR 203 Utility 124 Economy 75 59 D & BTR 392 484 458 540 3 BTR COM 167 205 172 246 4 Common 131 114 99 57 5 Common 85 61 60 57 Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Arden Sawmill Target Sizes Boards Green Finished Thickness: 1” = 0.940” 1” = 0.75” Widths: 4” = 4” 4” = 3.5” 6” = 5.875” 6” = 5.5” 8” = 7.875” 8” = 7.25” 12” = 11.875” 12” = 11.25” Dimension Thickness: 2” = 1.750” 2” = 1.50” Widths: 4” = 4” 4” = 3.5” 6” = 5.875” 6” = 5.5” 8” = 7.875” 8” = 7.25” 12” = 11.875” 12” = 11.25” For the purpose of this discussion: Lumber Cubic ft of solid wood, CF or Cunits (100 CF) Scribner bf / 12 = Cubic ft Logs of solid wood, CF or Cunits 1,200 bf Scribner = 1 Cunit Cubic is Cubic, CF or Cunits Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Lumber Cubic ft / Gross Scribner Cubic ft 3.0 CF Lbr 2.5 2.0 1.5 1.0 Gross 0.5 Scribner 0.0 4 6 8 10 12 14 16 18 20 22 24 CF Log Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Lumber Cubic ft / Net Scribner Cubic ft 3.0 CF Lbr 2.5 2.0 1.5 1.0 Net 0.5 Scribner 0.0 4 6 8 10 12 14 16 18 20 22 24 CF Log Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Lumber Cubic ft / Log Cubic ft Gross 100% CF Lbr 90% 80% 70% 60% 50% 40% 30% 20% Gross 10% CF Log 0% 4 6 8 10 12 14 16 18 20 22 24 Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Lumber Cubic ft / Log Cubic ft Net 100% CF Lbr 90% 80% 70% 60% 50% 40% 30% Net 20% 10% CF Log 0% 4 6 8 10 12 14 16 18 20 22 24 Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Log #2 Thick Gross Scribner Gross Length Board Top Butt Scribner Defect Scribner Net Cubic Gross Cubic Defect Cubic Net Board Width Board Grade Board bf Lumber Volume $ Value Lumber Cubic Lumber Volume 8 10 30 10 20 7.2 0.4 6.8 1.0 4.0 16 22 5.3 0.89 0.3 1.0 4.0 16 22 5.3 0.89 0.3 Volume Value 1.0 4.0 10 C 3.3 0.43 0.2 Lumber 3.7 cf $14.30 1.0 4.0 14 22 4.7 0.78 0.3 Residuals 3.5 cf $1.50 2.0 6.0 16 2 16.0 3.46 0.9 Total log 7.2 cf $15.80 2.0 6.0 16 18 16.0 4.83 0.9 Manufacturing ($8.00) 2.0 6.0 14 2 14.0 3.02 0.8 Return to Log $7.80 64.6 14.30 3.7 Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 Log #2 Alternative Volume Divisors to Calculate RTL $ per unit Lumber Scribner Cubic 100 CF Gross Net Net Gross Net Value (Cunits) MBF MBF Cunits Cunits Cunits Volume 0.037 0.030 0.020 0.0167 0.072 0.068 Total Rev $15.80 $427 $527 $790 $948 $219 $232 Mfg Cost $8.00 $216 $267 $400 $500 $111 $118 Return to Log $7.80 $211 $260 $390 $448 $108 $114 Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF ($/Cunit)__ 550 500 TL REV 450 400 LBR REV 350 300 RTL 250 200 150 6 - 8 9 - 13 14+ 100 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Correlation Coefficient Analysis Tool RTL Lumber CF Compared Difference Between RTL to Hypothetical Log Scale Lumber CF & Hyp. Scale Corr. Coeff. 120 400 to Lbr RTL 350 100 300 80 Hyp. #1 250 Hyp. #1 60 (Const. (Const. Diff.) 200 Diff.) 40 1.000 150 20 100 0 50 6 8 10 12 14 16 18 20+ 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Correlation Coefficient Analysis Tool RTL Lumber CF Compared Difference Between RTL to Hypothetical Log Scale Lumber CF & Hyp. Scale Corr. Coeff. 120 400 to Lbr RTL 350 Hyp. #1 100 Hyp. #2 (Const. (Incr. 300 Diff.) 80 Diff.) 1.000 250 60 200 40 Hyp. #1 Hyp. #2 (Const. 150 (Incr. Diff.) 20 Diff.) 100 0.987 0 50 6 8 10 12 14 16 18 20+ 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Correlation Coefficient Analysis Tool RTL Lumber CF Compared Difference Between RTL to Hypothetical Log Scale Lumber CF & Hyp. Scale Corr. Coeff. 120 400 to Lbr RTL Hyp. #1 100 Hyp. #2 350 (Const. (Incr. Diff.) 80 Diff.) 300 1.000 60 Hyp. #1 250 Hyp. #2 40 (Const. (Incr. Diff.) Diff.) 200 20 0.987 0 Hyp. #3 150 (Random) Hyp. #3 -20 (Random) 6 8 10 12 14 16 18 20+ 100 -40 0.316 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF ($/Cunit) 400 350 300 250 200 150 100 6 - 8 9 - 13 14+ 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 $/Cunit 200 Net 150 100 Scribner 6 - 8 9 - 13 14+ 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 $/Cunit 200 8” Net 150 100 Scribner 6 - 8 9 - 13 14+ 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 $/Cunit 200 9” Net 150 100 Scribner 6 - 8 9 - 13 14+ 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner & Cubic All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 Net Cubic Net $/Cunit 200 0.944 150 Scribner 100 6 - 8 9 - 13 14+ & Cubic 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner & Cubic All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 Net Cubic Net $/Cunit 200 0.944 150 Scribner 100 6 - 8 9 - 13 14+ & Cubic 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs. Scribner & Cubic All Test Logs CF Lbr Corr. Coeff. 400 to Lbr RTL 350 Net Scribner 300 0.584 250 Net Cubic $/Cunit Net 200 0.944 150 Scribner 100 6 - 8 9 - 13 14+ & Cubic 50 6 8 10 12 14 16 18 20+ Log Diameter (small-end) Douglas-fir-Larch Log Test Plum Creek’s Arden, WA Sawmill 1991 RTL Lumber CF vs.
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