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 pholad attack are expected, dual treatment is recommended. The attached map (from AWPA
Standard C3) provides general guidance on the location of marine borers. Consult the nearest
NAVFAC EFD Applied Biologist for specific requirements for specific locations. Creosote wood
should not be used for walking surfaces or for structures such as handrails where it will be subject
to human contact. Refer to para. 5.9 for properties of treated wood.
3.1.2.4 Records. Include in the construction records the wood species, preservative type,
retention, and producer of installed treated timber.
3.1.2.5 Environmental Considerations. Consult with your environmental office for possible local
regulations that restrict the use of treated wood in aquatic environments. Where a project
involves the installation of a large volume of treated wood in an area of low water volume and
limited flushing action or where there is any reason for environmental concern, a site specific
environmental risk assessment may be advisable. Treated wood should be visually inspected
before installation to assure no excessive residual materials or preservative deposits exist.
Maximum chemical loading should not exceed 1.4 times the minimum retention specified for
creosote treatments and 1.25 times the minimum for arsenical salt treatments. Plans for handling
the treated wood upon dismantling of the structure should be considered in the design phase,
especially in areas where the disposal of treated wood may become restricted.
3.1.2.6 Quality Assurance. Each treated timber lot must be branded in some form by the producer
in accordance with AWPA M6. An inspection report by an independent inspection agency
accredited by the American Lumber Standard Committee should accompany each timber
shipment. All treated timber should be stored and handled in accordance with AWPA M4.
3.1.2.7 Safety Requirements. Specifiers and installers must follow the guidance in the treated
wood Material Safety Data Sheets (MSDS) and hazard labels as required by OSHA and use the
product in conformance with the Consumer Information Sheet that must be provided by the
treated wood supplier.
3.1.2.8 Field Cuts. Insofar as possible, all field cuts including bolt holes that expose untreated
wood should be avoided. Where field cuts are absolutely necessary, the cuts and subsequent
preservative treatments should be accomplished in accordance with AWPA M4. If feasible, order
all cuts including bolt holes done prior to pressure treatment.
3.1.2.9 Minimum Dimension. [?]
3.2
Timber. Timber used in the deck structure shall conform to the requirements for
substructure framing and bracing except as modified below.
3.2.1 Preservative Treatment. The use of untreated timber should be avoided wherever possible
and, except for temporary structures, can be used only above mean high water level. Untreated
timbers should be kept as dry as possible by designing for efficient water drainage that eliminates
any water accumulation on wood and by protecting the cut off ends of timber (decay often starts
in wood joints). Treated timbers shall conform to current American Wood Preservers'
A-3
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