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Specifications $UP2oo7 - 003 (z. 14783 sm./ 109 TE AVL�. I - 12_ .��ii Treated ..w............ - e - rrr-A. --- vl July 2004 Provided by Western Wood Preservers Institute SPECIAL EDITION Treated Wood and the 2003 International Residential Code The International Residential Code recognizes 4. The ends of wood girders entering exterior 2. Vertical members such as posts, poles the problems inherent in certain applications masonry or concrete walls having dearances and columns. and the effectiveness of properly treated of less than 0.5 inch on tops, sides and ends. 3. Both horizontal and vertical members. wood in enduring those situations. For some 5. Wood siding, sheathing and wall framing applications, the code requires treated wood; on the exterior of a building having a R319.1.3 Posts, Poles and Columns. for others it allows either pressure - treated clearance of less than 6 inches from Posts, poles and columns supporting wood or a wood classified as naturally the ground. permanent structures that are imbedded in resistant to decay. The following excerpts 6. Wood structural members supporting concrete in direct contact with the ground are references to treated wood taken from moisture - permeable floors or roofs that or embedded in concrete exposed to the the 2003 International Residential Code. are exposed to the weather, such as con- weather shall be approved pressure preserva- crete or masonry slabs, unless separated tively treated wood suitable for ground Chapter 3 from such floors or roofs by an impervious contact use. moisture barrier. BUILDING PLANNING 7. Wood furring strips or other wood framing R319.1.4 Wood Columns. SECTION R319 members attached directly to the interior Wood columns shall be approved wood PROTECTION AGAINST DECAY of exterior masonry walls or concrete walls of natural decay resistance or approved below grade except where an approved pressure preservatively treated wood. R319.1 Location Required. vapor retarder is applied between the wall Exceptions: I. Posts or columns which are In areas subject to decay damage, the and the furring strips or framing members. either exposed to the weather or located in following locations shall require the use of basements or cellars, supported by piers or R319.1.1 Ground Contact. an approved species and grade of lumber, metal pedestals projecting 1 inch above the pressure treated in accordance with All wood in contact with the ground and floor or finished grade and 6 inches above American Wood - Preservers' Association that supports permanent structures intended exposed earth, and are separated therefrom (AWPA) Standard Cl, C2, C3, C4, C9, C15, for human occupancy shall be approved by an approved impervious moisture barrier. C18, C22, C23, C24, C28, C31, C33, P1, P2 pressure preservatively treated wood suitable 2. Posts or columns in enclosed crawl spaces or and P3, or decay - resistant heartwood of a for ground contact use. unexcavated areas located within the periphery naturally durable species. of the building supported by a concrete pier R319.1.2 Geographical Areas. or metal pedestal at a height greater than 1. Wood joists or the bottom of a wood In geographical areas where experience 8 inches from exposed ground, are separated structural floor when doser than 18 inches has demonstrated a specific need, approved therefrom by an impervious moisture barrier. or wood girders when closer than 12 inches naturally durable or pressure preservatively to exposed ground in crawl spaces or treated wood shall be used for those portions R319.2 Quality Mark. unexcavated area located within the of wood members that form the structural Lumber and plywood required to be pressure periphery of the building foundation. supports of buildings, balconies, porches or p q P similar permanent building appurtenances preservatively treated in accordance with 2. All wood framing members that rest on P g pP Section R319.1 shall bear the quality mark concrete or masonry exterior foundation when such members are exposed to the of an approved inspection agency that main - walls and are less than 8 inches from weather without adequate protection from tains continuing supervision, testing and exposed ground. a roof, eave, overhang or other covering that inspection over the quality of the product would prevent moisture or water accumula- and that has been approved by an accredita- 3. Sills and sleepers on a concrete or masonry tion on the surface or at joints between # tion body* that complies with the require - slab that is in direct contact with the members. Depending on local experience, ments of the American Lumber Standard ground unless separated from such slab such members may indude: Committee treated wood program (see by an impervious moisture barrier. 1. Horizontal members such as girders, Quality Assurance Section). joists and decking. (continued on back) * Accreditation Body. An approved, third -party organization that is independent of the grading and inspection agencies, and the lumber mills, and that initially accredits and subsequently monitors, on a continuing basis, the competency and performance of a grading or inspection agency related to carrying out specific tasks. WESTERN WOOD PRESERVERS INSTITUTE • 7017 N.E. HIGHWAY 99 • VANCOUVER, WA 98665 • 1- 800 - 729 -WOOD WEB: wwwWWPlnstitute.org • E -MAIL: info @WWPInstitute.org R319.2.1 Required Information. QUALITY ASSURANCE The required quality mark on each piece INTRODUCTION of pressure preservatively treated lumber The American Lumber Standards Committee (ALSC) is responsible for the oversight and or plywood shall contain the following information: accreditation of third party inspection agencies for treated wood. In order to comply with the International Building Code, treated wood must be marked with the quality stamp or end tag 1. Identification of the treating plant. of an accredited ALSC agency. 2. Type of preservative. WWPI recognizes quality marks for treated wood are sometimes confusing with much 3. The minimum preservative retention. product information including proprietary brands, warranties, etc. To help clarify the situation, 4. End use for which the product was treated. WWPI created the CheckMark Identification Program to easily find and recognize the 5. Standard to which the product was treated. various ALSC accredited agency's trademarks. Look for the CheckMark m° on the stamp 6. Identity of the approved inspection agency. or end -tag to quickly find the ALSC accredited agency's logo. 7. The designation "Dry; if applicable. The treating industry also produces products that do not require ALSC oversight; such R319.3 Fasteners. products include landscape timbers for non - structural applications, decking products which carry their own manufacturer's warranty, etc. Fasteners for pressure preservative and The American Lumber Standards Committee certifies three agencies that serve the West. fire- retardant - treated wood shall be of hot- Those meeting the ALSC criteria include: dipped galvanized steel, stainless steel, silicon bronze or copper. Exception: One-half-inch diameter or greater B CSI 11) steel bolts. Bode Inspection Canadian Softwood Timber Products Inspection Inspection, Inc. SECTION R320 PROTECTION AGAINST TERMITES ``Third party" agencies verify that pressure- treated wood was properly treated in accordance with AWPA standards. Third party inspection is not mandated by law, but is necessary to R320.1 Subterranean Termite Control. comply with the IBC. To be certain of receiving the treated wood that was specified, only accept or approve treated wood with a quality stamp or end tag of an accredited ALSC agency. In areas favorable to termite damage, methods of protection shall be by chemical INTERPRETING A QUALITY MARK soil treatment, pressure preservatively treated wood in accordance with the AWPA Trademark of Preservative used AWPA Standard Standards listed in Section R319.1, naturally ALSC accredited termite - resistant wood or physical barriers agency (such as metal or plastic termite shields) \ ® XXX .40 4 AWPA C2 /C9 UC4A Retention level or any combination of these methods. R320.1.1 Quality Mark. Proper exposure Ground Contact Treating Lumber and plywood required to be pressure condition / company preservatively treated in accordance with XYZ WOOD PRESERVING Section R320.1 shall bear the quality mark CITY, STATE Plant location of an approved inspection agency which maintains continuing supervision, testing and inspection over the quality of the TREATING STANDARDS product and which has been approved by RETENTION LBS. /CU. FT. AWPA STANDARDS FOR an accreditation body that complies with APPLICATION STRUCTURAL APPLICATIONS the requirements of the American Lumber ACQ/ACZA CA-B DOT Standard Committee treated wood program Above Ground 0.25 0.10 N/A Cl General (see Quality Assurance Section). C2 Piles Timbers es Ground Contact, C3 Poes C4 Poles R320.3 Pressure Preservatively Fresh Water 0.40 0.21 N/A c9 Plywood Treated and Naturally Resistant Wood. Immersion C14 .... Highway C15 .... Commercial- Residential Heartwood of redwood and eastern red In Ground C16 .... Farms cedar shall be considered termite resistant. (Structural) 0.60 0 N/A C22 .... Permanent Wood Foundations Pressure preservatively treated wood and C23 .... Pole Buildings naturally termite - resistant wood shall not be Above Ground C24 .... Sawn Timber Piles Y C28 .... Glue- Laminated Beams Continuously used as a physical barrier unless a barrier Protected from 0.25 0.10 0.25 C31 .... Out of Contact with Ground and can be inspected for any termite shelter Continuously Protected from Liquid Water Liquid Water tubes around the inside and outside edges (Sillplate) C33 .... Structural Composite Lumber and joints of a barrier. 8320.3.1 r Field Treatment. DISCLAIMER: The Western Wood Preseners Institute believes the information contained herein lobe based on up- to-date, scientific and economic information and is intended for general information purposes. In furnishing this information, the Institute makes no warranty or representation. either expressed or implied, as to the reliability or accuracy Field cut ends, notches and drilled holes of of such information; nor does the Institute assume any liability resulting from use of or rdiance upon the information by any party. This document should not be construed as a specific endorsement of warranty, direct or implied, of treated wood produce or preservatives, in terms of performance, environmental impact, or safety. The information pressure preservatively treated wood shall be contained herein should not be construed as a recommendation to violate any federal, provincial. state or municipal law, rule or regulation, and any party using or producing pressure- treated wood products should review all such laws. rules or regulations prior to using or producing treated wood products. retreated in the field in accordance with ao AWPA M4. c Printed in the USA on recycled paper. © WWPI 7/2004