sizes of Class A (14-inch butt) and Class B
(12-inch butt) piles for designers that prefer
these designations.
Material strength values for the various
species of timber piles are published
in the National Design Specification for
Wood Construction by the American
Wood Council. The published design values
apply only to timber piles conforming
to ASTM D25. These strength values are
used in determining the bearing capacity,
lateral capacity and allowable driving stress
of a pile.
With the development of the wood
preservation industry, the need arose for
standards to specify the preservatives and
treatment processes to be used. There
are a number of preservatives available to
protect wood from biological attack. The
American Wood Protection Association
(AWPA) establishes the standards necessary
for consistent applications and processes.
AWPA standards provide the proper
preservative to use with each species of
timber and the retention level for various
exposure conditions.
AWPA has established Use Category
System Standards. These standards determine
the appropriate treatment based on
how timber will be used during its service
life. Use Category System Standard
U1 is used by specifiers to determine the
appropriate treatment for a particular
service condition.
Standard U1 contains five major Use
Categories that describe the service conditions
to which wood will be exposed.
Within the various Use Categories there are
Commodity Specifications that provide specific
information, including retention values
for each species/preservative combination
and any applicable special requirements.
Timber piles are found in two Use
Categories. Foundation piles and piles
used on land or in fresh water are listed
in UC4C, Commodity Specification
E: Round Timber Piling. Piling used in
saltwater environments are listed in UC5,
Commodity Specification G: Marine
Applications. Timber piles used in marine
applications are further divided into subcategories
UC5A, UC5B and UC5C. These
subcategories are based on geographical
location and define the amount of preservative
needed to provide optimum protection.
The following is a chart showing the
various Use Category subdivisions for
timber piles in marine applications followed
by a list of the prescribed treatments
and retention levels for the com-
TIMBER
Sample Specification:
Round Timber Piles: Piles shall be
Southern Pine and shall conform to
ASTM D25, unused, clean peeled,
uniformly tapered, one piece from butt
to tip. Specify butt or tip diameters
from Tables X1.1 through X1.5. The pile
length should be specified as well.
Preservative: Pressure treatment shall
be in accordance with the following
AWPA Use Category Standard: UC4C,
UC5A, UC5B or UC5C.
Handling, storage and field fabrication,
including the treatment of cut ends or
penetrations, shall be in accordance
with AWPA M4.
Your Steel Pipe & Piling Experts Since 1997
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ASTM A252 GR. 2 & 3 − ASTM A53 – A106 – API5L – X-GRADES − A36
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AlphaPipeCompany
ALPHA PIPE COMPANY
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Los Angeles, CA
Bay St Louis, MS
Philadelphia, PA
St. Louis, MO
Houston,TX
Oklahoma, OK
1-800-860-0599
102 | ISSUE 3 2018
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