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Lumber Grading and Grade Marks “The Wood Products Council” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be reportdtted to AIA/CES for AIA mem bers. Cer tifica tes of C omp le tion for Lumber Grading both AIA members and non-AIA members are available upon request. and This program is registered with AIA/CES for continuing professional Grade Marks education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation. Presented by: Jo hn “Bu ddy ” Showa lter, P .E . Vice President, Technology Transfer Copyright © 2007-2010 American Wood Council. All rights reserved. Copyright Materials Learning Objectives This presentation is protected by US and International Copyright laws. Reproduction, At the end of this program, participants will be knowledgeable of: distribution, display and use of the presentation without written pppermission of the speaker is prohibited. 1. Wha t in forma tion gra de mar ks s hou ld con ta in. 2. How grading is done. 3. Variations in gggrade marks such as are found on finger- © American Wood Council 2011 jointed lumber. 4. Code-accepted alternatives to a grade mark. Grade Marks Grade Marks • IRC R502.1: “Load-bearing dimens ion lum ber for jo is ts, beams and girders shall be identified by a grade mark of No 2 a lumber grading or insppgyection agency that has been approved by an D ACME Fir accreditation body that complies with DOC PS 20.” 14 S-Dry R602.1 and R802.1 are similar Grade Marks Grade Marks LbLumber gra de LbLumber gra de No 2 No 2 D D Lumber ACME Fir ACME Fir species 14 14 S-Dry S-Dry Grade Marks Grade Marks LbLumber gra de LbLumber gra de No 2 No 2 D Lumber Trademark D Lumber ACME Fir species or logo ACME Fir species 14 14 S-Dry S-Dry Moisture content Moisture content Grade Marks Grade Marks LbLumber gra de No 2 No 2 Heat-treated D Lumber to kill insec ts – D Trademark ACME Fir species for international ACME Fir shipments Mill 14 14 identification S-Dry HT S-Dry Moisture content Grade Marks Grade Marks • IRC R502.1*: “Load-bearing dimens ion lum ber for jo is ts, beams and girders shall be identified by a grade mark of a lumber grading or inspection DOC PS 20 aggyency that has been app roved by an accreditation body that complies with DOC PS 20.” * R602.1 and R802.1 are similar Grade Marks Grade Marks • IRC R502 . 1: “Loa d-bibearing AiAmerican LbStddCLumber Standards Comm ittee • www.alsc.org dimension lumber for joists, • Untreated wood program beams and girders shall be • Untreated facsimile list identified by a grade mark of a lumber gggrading or inspection agency that has been approved by an accreditation body that complies with DOC PS 20.” Grade Marks Grade Marks Grade Marks Grade Marks Grade Tra demar k/Logo Mill ID Moisture content Grade Marks Grade Marks • Machine evaluated • Correlates stiffness (machine stress rated) or density (machine evaluated) to other properties Grade Marks Grade Marks Trademark/Logo Mill ID Wood species Moisture content Grade Marks Grade Marks: Certificate of Inspection • IRC R502.1: “Load-bearing • Not manufacturer/supplier letter dimension lumber for joists, beams and girders shall be identified by a • From ALSC-approved ggggrade mark of a lumber grading or grading/inspection agency inspection agency that has been • Assurance that lumber conforms approved by an accreditation body with grading rules that complies with DOC PS 20. In • Letterhead of accredited agency lieu of a grade mark, a certificate of • Information about lumber inspection issued by a lumber – Grade & species grading or inspection agency meeting the requirements of this – Moisture content section shall be accepted.” – Size & number of pieces inspected • Identifying mark on each piece Finger Jointed Lumber Finger Jointed Lumber • HRA • Widely accepted for – Heat Resitistan t Adhes ive use by IBC and IRC – Designated on grade • Interchangeable stamp with solid sawn – Used where fire rated assemblies are required lumber with certain by code limitations: • Exterior walls – HRA • Dwelling unit separations • Commercial tenant – NON-HRA separations – Wet service – OiOrien ta tion Finger Jointed Lumber Finger Jointed Lumber • NON-HRA • HRA marks absent? – Adhesive not rated for – Treat same as NON-HRA heat resistance – Designated on grade stamp ? Finger Jointed Lumber Finger Jointed Lumber • Other Stamp Designations • Adhesive Performance Testing – Exterior Use allowed – Structural applications are not – ASTM D7374-08 limited – ASTM D7470-08 – Must meet HRA criteria in – adhesive to sustain ASTM E119 rated assemblies fire test o f l oad -bibearing en d- jointed stud wall assembly loaded to 100% of allowable design load for 1-hour Finger Jointed Lumber Finger Jointed Lumber • Other Stamp Designations • Other Stamp Designations – Old grade marks – STUD USE ONLY or – VERT USE ONLY – Limited to use where bending or tension stresses are of short duration NDS Chapter 4 – Lumber NDS 2005 Supplement • Design values 2005 – Visually graded lumber 1 Sawn Lumber Grading Agencies 2 Species Combinations – MSR / MEL 3 Section Properties – Timber 4 Design Values - Lumber, Timber, and Decking – Decking - MSR and MEL --NonNon--NorthNorth American Sawn Lumber 2005 NDS Supplement - Lumber 2005 NDS Supplement Visually graded dimension lumber (Table 4A) Visually Graded Dimension Lumber (Table 4B) 2005 NDS Supplement 2005 NDS Supplement Mechanically Graded Dimension Lumber (Table 4C) Visually Graded Timber (Table 4D) • MSR and MEL 2005 NDS Supplement 2005 NDS Supplement Visually Graded Decking (Table 4E) Non-North American Species (Table 4F) • 2” - 4” thick • Various widths • Different from 5/4” decking – Span rated per ALSC policy – Usually rated at 16 ” – 24” on center Stress Rated Boards Species not in NDS Nominal 11,",1 1-1/4", and 1-1/2“ • Foreiggpn species • Southern Pine Inspection Bureau – mahogany, ipe, greenheart, etc., • Domestic species – 2002 Standard Grading Rules for – ash, locust, magnolia, walnut, etc., Southern Pine Lumber • Wood Handbook • Section 265 stress rated boards – Industrial 55 (IND 55) – http://www.fpl.fs.fed.us » graded per No. 1 dimension – average unadjusted ultimate values – Industrial 45 (IND 45) – need to be adjusted per ASTM D245 »graddded per No. 2di2 dimens ion • NtNot gra de s tampe did in – Industrial 26 (IND 26) accordance with ALSC » graded per No. 3 dimension • Engineering judgment Tongggue and Groove Roof Decking Course Evaluations In order to maintain high-quality learning experiences, please access • WCD #2 Tongue and Groove the evaluation for this course byyggg logging into CES Discover y and clicking on the Course Evaluation link on the left side of the page. Roof Decking – Specialty lumber product – Nominal 3” and 4” decking – especially well adapted for use with glued laminated arches Questions? This concludes The American Institute of Architects Continuing Education Systems Course www.awc.org info@awc. org.
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