BEFORE THE ARCHITECT – CUSTOM HOME DESIGNING BACKGROUND – CUSTOM HOME DESIGN ARTICLES

PRESERVATIVE-TREATED WOOD FASTENERS

YOU MAY FREELY QUOTE THE AG WITH PROPER ATTRIBUTION

To regard code-compliance as the objective is to leave definitions of quality to the other guy.   Before The Architect

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Pressure-treated wood fasteners.  Fasteners for pressure-treated wood.  Where for art thou, treated wood fasteners?

Boss, we gotta talk.

FASTENING PRESERVATIVE-TREATED WOOD

Comment:  Applicable to wood deck members, mudsills and other members in contact with concrete, e.g., pocketed beams, floor joists, floor trusses, etc. or subject to atmospheric exposure, e.g., porch posts, framing lumber, plywood, knee braces, furring strips, mouldings, etc.: 

Comment:  Solely as a primer for your basic reference on the newer wood preservative treatments, the AG respectfully directs the reader’s attention to a Simpson Strong-Tie offering on preservative chemicals and the wood-treated marketers by name at http://www.strongtie.com/productuse/ptw-tradenames.html

Conformance

1)     Overall guidance, TPI/WTCA (a/k/a Truss Plate Institute/Wood Truss Council of America) Interim Guidelines for Use of Alternative Preservative Treatments With Metal Connector Plates, January 27, 2004 guidelines: <http://www.fhba.net/tpi_guidelines.htm>.  Such preservatives include, among others, separately, sodium borate or iodine based preservatives, sodium borate based fire retardants that are also preservatives, and copper based preservatives.

 2)     If fasteners (if not stainless steel, then hot-dip galvanized only, not galvannealed), ASTM A653-03 Class G185 (a/k/a American Society for Testing and Materials, "Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process". 

3)     If galvanized connectors and metal sheet fasteners, then ASTM A153-98 (a/k/a American Society for Testing and Materials, "Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel " Steel"  Hardware". 

4)     If stainless steel sheet metal anchors and ties, then ASTM A-167-96, AISI Type 304 and Type 316 (a/k/a American Society for Testing and Materials, "Standard Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip", American Iron and Steel Institute, exclusive types are in increasing order of corrosion resistance). 

5)     If stainless steel wire ties and anchors, then ASTM A580-98, AISI Type 304 and Type 316 (a/k/a American Society for Testing and Materials, "Standard Specification for Stainless Steel, American Iron and Steel Institute, exclusive types are in increasing order of corrosion resistance).

  Comment:  The importance of this inclusion rests on the switch from chromated copper arsenate (CCA) preservative for wood to other chemical preservatives, notably Alkaline Copper Quat (ACQ Types A and B) and Copper Azole (CBA -A & CA-B ), among others.  It is determined by others that common fasteners for CCA-treated wood may corrode more quickly in wood treated otherwise; therefore, fasteners, including plates, shall be distinguished by qualifying at selected levels of galvanized method or coverage or of stainless steel when those fasteners, plates, etc. come into contact with the above-referenced, newer wood preservatives either by abut or penetration.  The AG suggests consideration of a reference in this regard - http://www.ibacos.com/pubs/Factsheets/WP_PreservedWood.pdf .

        Comment:  Stainless steel fasteners may be either recommended or required for fastening deck members newly preserved; stainless steel and any galvanized fastener elements shall not be abutted. 
       
        Comment:  Optionally and not in lieu, #15 felt paper or equivalent may be laid between newly preserved members and metal fasteners at sides, bottoms, and butts of members abutting the fasteners. 

6)     Note that if borate (a/k/a DOT, or disodium octaborate tetrahydrate) is the wood preservative –

a)     the wood so preservative-treated shall be applied only in persistently dry areas, e.g., most mudsills or sill plates, unless otherwise noted, and

b)     no special materials are required either to comprise or coat the fasteners, flashings, etc. beyond those applied either to untreated lumber or CCA (chromated copper arsenate)-treated lumber.

c)      borate -treated material shall be minimally exposed to elements on-site before application.

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