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<br /> �. LUMBER DIMENSIONS.Tabulated design values are applicable to lumberthat will be used under dry condiiinn::such n:,in mual cucrirtl�tilru��turcti I�ui ?"lu
<br /> 4"thiek lumber the DRY dressed si'r.es shall be used(see Table IA)regardless of the moisture content at the timc��I innnulndin�c�n uvc In i�nlculalin�dcsi�,n
<br /> values,the natural gain in strength and stiCfness that occurs as lumber dries has been taken into eonsideration as wcll,is lhc rrduclinn in si�r thul i�ccurr when
<br /> unseasoned lumber shrinks.The gain in load carrying capacity due to increased strength and stiffness resulting from drying morc Ih:m��Ilvrls Ilic ilrsik.n r11�•cl ul
<br /> size reductions due to shrinkage.
<br /> 2. SPECIFIC GRAVITY,G,SHEAR PARALLEL TO GRAIN,F�,AND COMPRESSION PERPENDICOLAR TO CRA1N,N�,.Valucs fui �spccilic gr}ivi�y,
<br /> G,shear parallel to grain,F�,and compression perpendicular to grain,F�l,are provided below for MSR and MEL lumber.For species ur srecics grnu�iti nol shnH n
<br /> below,lhe G,F,,,and F�l values for visually graded lumber may be used.Higher G values may be claimed when(a)specifically assigncd by thc rulcs wrilin�,ugrncy
<br /> or(b)when qualified by[est,quality controlled for G and provided for on the grade stamp.When a different G value is provided on the gradc stciitir,hiR�hcr P,,un�l
<br /> Fi1 design values may be calculated in accordance with[he grading rule requirements.
<br /> Design Values
<br /> �
<br /> Compression �
<br /> Species Modulus of Specific Shear Parallel Perpendicular Grading Rules Agency
<br /> Elasticity Gravity to Grain to Grain
<br /> E(x10�)>Psi G F�,Psi F�l,psi �
<br /> lA and higher Q:50 180 : 625 WCLIB,WWPA -�ry
<br /> 2.0 0.51 l80 670 WCLIB,WWPA m
<br /> ."p
<br /> 2.1 0.52 I 80 690 Rl
<br /> Douglas Fir-Laroh 2.2 0.53 l80 715 Z
<br /> 23 0.54 I 85 735 �
<br /> �
<br /> 2.4 0.55 l85 760 0
<br /> 12 ro I.9 0.49 ]80 625 �
<br /> Douglas Fir-Larch(N) 2.0 to 22 0.53 I SO 7]� NLG/�
<br /> 23 and hi�her 0.57 1JO 715 NLGA �
<br /> Z
<br /> Douglas Fir-South 1.0 and liigher 0.46 , 180 5�0 WWPi1 �
<br /> Englemann Spruce- 1.Oand higher 0,38 135 335 WWPA �-
<br /> Lodgepole Pine LS and hieher 0:46 lb� 555 WWPfI m
<br /> 1.0 and higher 0.43 150 405 WCLTB,WWPA N
<br /> I.6 Q44 155 ?10
<br /> 1.7 0.45 160 535
<br /> 1.8 0.46 ]60 555
<br /> _. _ . _ _ . - . _ _ ____-- -_ ------ - ___ __ . _ _ __ _ _
<br /> Hcu�-Fii � �� � 1.9 0.47 165 �� � 580 � WCLIB,WWPA
<br /> 2.0 0.48 170 600
<br /> 2.1 0.49 170 625
<br /> 2.2 0.50 175 ��,, 645
<br /> 2.3 0.51 190 ,,.-��`' 670
<br /> 2.4 0.52 190 ,�`�-� 690
<br /> Hem-Fir(N) 1.O and hi�her 0.46 14,5 r,�''�y 40� NLGA
<br /> Southern Pine 1.0 and lligher O.SS '. ��:T5 56� SPIB
<br /> 1.8 and higher 0.57 ,�e,`�'" 190 80� SPIF3
<br /> �_ ,,.---•---...,,,,` 1.2 and higher 0.42 ;��• 135 425 NLGA
<br /> r�''r�,
<br /> LiSpruce-Pine-Fir � 1.S t 0.4�� 160 525 NLGA
<br /> _ _
<br /> _ _..._ „ ,
<br /> ` - `. 2.0 and higher � O.SO�,,,..�P , 170 615 NLGA
<br /> ]A and hig er � 0.36 . 135 335 NELIvIA,NSLB,WCL1B,WWPA
<br /> 12 to 1.9 0.42 I50 465 NFLMA,NSLB
<br /> �pruce-Pine-Fir(South) 12 to 1.7 0.42 150 465 WWPA
<br /> L8 to 1.9 0.46 160 555
<br /> 2.0 and higher 0.50 175 645 NELMA,NSLF3,WWPA
<br /> Western Cedars 1.0 andhigher 0:3fi 155 425 WC:LIB,WWPA
<br /> Western Woods 1.0 and hibher 0.36 135 335 WCLI$,WV✓PA
<br /> 3. MODUL[JS OF ELASTICITY,E,AND TENSION PARALLGL TO GRAIN,F,. For any given bending design value,Fe,the modulus of elasticity,E,and
<br /> tension parallel to grain,F,,design value may vary depending upon species,timber source,or other variables.The"E"and"F,"values included in the"Fi,-E"grade
<br /> designations in Table 4C are those usually associated with each"F�" level. Grade stamps may show higher or lower values if machine rating indicates the
<br /> assignment is appropriate.Where the"E"or"F,"values shown on a grade stamp differ from Table 4C values associated with the"Fe"on the grade stamp,the values
<br /> on the stamp shall be used in design,and the"F�"value associated with the"Fe"value in Table 4C shall be used.
<br /> �. COMPRESSION PARALLEL TO GRAI:\,P'�.This grade requires"F�"qualification and quality control.
<br /> AMERICAN FOREST Y�PAPER�1SSOCIATION ,
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