1050.1 Scope. This specification covers wood products as defined in the AWPA Standards.
1050.2 Posts.
1050.2.1 Posts and Blocks for Guardrail. Posts and blocks for guardrail shall be furnished in accordance with
AASHTO M168, rectangular, standard rough sawn or planed, and of the size and length shown on the plans. Posts and blocks shall be pressure treated in accordance with Sec 1050.6. All framing and boring shall be completed before treatment.
1050.2.2 Posts for Fence. Posts for fence shall be round and of the sizes and lengths shown on the plans. Posts
shall be pressure-treated in accordance with Sec 1050.6. Allowable tolerances for size and length will be as follows: Fence Post Tolerances Dimension Tolerance ≤4-inch diameter +1/2, No minus tolerance > 4-inch diameter +1 inch, No minus tolerance All Lengths (any diameter)No limit on over length, Minus 1 inch
1050.2.2 1 Grade. Wood for posts shall be sound, free of decay, excessive knots and of end splits and seasoning
checks that might affect serviceability. Posts shall be free of multiple crooks, except crooks in one plane only in accordance with Sec 1050.2.2.2 will be permitted.
1050.2.2 2 Straightness. A straight line drawn from the center of one end of the post to the center of the
opposite end shall not deviate from the longitudinal axis of the post at any point more than one percent of the length of the post.
1050.2.2 3 Manufacture. Posts shall be clean peeled to remove all bark, except that strips of inner bark no more
than 1/2 inch wide or more than 3 inches long will be permitted to remain on the peeled post. All protruding knots shall be trimmed flush, and all spurs and splinters shall be removed. The natural taper of round posts shall be followed in machine peeling operations. The ends of all posts shall be cut square, except posts to be driven shall be machine-pointed on the small end prior to treatment.
1050.2.3 Posts for One-Strand Access Restraint Cable. Posts for one-strand access restraint cable may be
round or rectangular, as shown on the plans. Round posts shall be in accordance with Sec 1050.2.2. Rectangular posts shall be standard rough sawn or planed, and of the grade specified in Sec 1050.2.2.1. All posts shall be in accordance with Sec 1050.6.
1050.2.4 Posts for Signs. Posts for signs shall be rectangular, rough sawn or surfaced four sides (S4S), with
square cut ends, and shall be of the grade, size and length shown on the plans. Posts shall be pressure-treated in accordance with Sec 1050.6. Other preservatives and wood species shall be in accordance with applicable AWPA Standards. If framing and boring is completed after pressure treatment, field treatment shall be in accordance with Sec 1050.7.
1050.2.4 1 Permanent. Project sign posts shall be treated to Use Category (UC) 4B.
1050.2.4 2 Temporary. Post for temporary use shall be treated to UC 4A.
1050.3 Lumber and Timber.
1050.3.1 Species and Grade Requirements. Unless otherwise specified, lumber and timber to be used as a
permanent part of a structure shall be one of the species shown in Table I or other treatable species as specified in the AWPA Standards, and of the grade specified on the plans. Lumber and timber for temporary structures shall be of the species and grades shown on the plans.
1050.3.2 Dressing Requirements. Lumber and timber shall be standard rough sawn or shall be surfaced as
specified in the contract. Lumber and timber shall be cut to exact lengths or to permissible variations in lengths shown in the contract documents.
1050.3.3 Treatment. If treatment is specified, lumber and timber shall be pressure-treated in accordance with
Sec 1050.6.
1050.4 Electric Substation, Service and Span Wire Assembly Poles.
1050.4.1 Electric Substation and Services Poles. Electric substation and service poles shall be of the length
and class specified in the contract documents, and shall be in accordance with ANSI O5.1. Poles shall be pressure treated in accordance with Sec 1050.6. Poles may be gained and drilled in the field after treatment. Areas exposed shall be treated in accordance with Sec 1050.7 before cross-arms or equipment are mounted.
1050.4.2 Span Wire Assembly Poles. Span wire assembly poles shall be of the length specified in the contract
and shall be in accordance with ANSI 05.1, Class IV, unless otherwise specified. The poles shall be pressure treated in accordance with Sec 1050.6. All poles shall have a minimum diameter of 6 3/4 inches, measured at the top of the pole.
1050.4.3 Pole Crossarms. The species, grade and treatment of crossarms to be erected on substation and service
poles will be shown on the plans.
1050.5 Round Timber Piles.
1050.5.1 Material. All round timber piles shall be in accordance with ASTM D 25, except for size, which shall
be in accordance with Table I for the class specified in the contract.
1050.5.2 Chemical Treatment. Piles shall be pressure treated in accordance with Sec 1050.6. Framing and
boring will not be required before treatment. Exposed untreated areas resulting from framing of treated piling shall be field treated in accordance with Sec 1050.7. Untreated piles for use in unexposed locations or in temporary bridges shall be of the species approved by the engineer.
1050.6 Timber Preservatives. Pressure preservative treatment shall be in accordance with current AASHTO
Standard M-133 and current AWPA Standards.
1050.6.1 Responsibility for Quality. The contractor shall use preservatives that meet these specifications or the
treated material will be subject to rejection, or to approved retreatment with an approved preservative.
1050.7 Care After Treatment. Care shall be taken in handling pressure-treated material to avoid damage. Cant
hooks, peavies, pickaroons and end cant hooks shall not be used on the side surfaces of treated material. All handling of treated round stock with pointed tools shall be confined to the ends. If damaged material is permitted for use by the engineer, or framing at site is required, remediation following current AWPA Standard M4 shall be followed.
1050.8 Inspection Requirements.
1050.8.1 Inspection. All material shall be inspected for compliance with these specifications in accordance with
AWPA Standard M2.
1050.8.1 1 Timber products treated within the State of Missouri or within 100 air miles of the border may be
inspected by MoDOT personnel.
1050.8.1 2 The inspection of lumber, timber, piling, posts and poles shall be performed by the supplier or an
approved inspection agency, and the cost for inspection shall be at the contractor’s expense.
1050.8.2 Inspection Agency. An approved inspection agency will be a laboratory, accredited by the American
Lumber Standards Committee, P.O. Box 210, Germantown, MD. Inspection agencies not accredited by the American Lumber Standards Committee shall submit for approval a resume to Construction and Materials. The resume of the agency shall include the agency’s history of inspection of timber and treated products, a listing of state highway agencies which have approved the inspection agency and a listing of state agencies for which the inspection agency has performed inspection.
1050.9 Certification. The contractor shall furnish to the engineer certification from the supplier or inspection
agency that the material furnished is in accordance with these specifications. Certification shall include or shall have attached a listing of the material being supplied. Except as noted, the certification shall have attached a certified test report, as detailed in Section 7.2 of AWPA Standard M2, from the supplier or inspection agency attesting to complete compliance with AWPA and these specifications. Electric substation, service and span wire assembly poles will not require certified test reports.
1050.10 Acceptance. Acceptance of material will be based on satisfactory supplier's certification or inspection
agency certifications, and upon results of any tests deemed necessary by the engineer at destination to ascertain compliance with these specifications. TABLE I Circumferences and Diameters of Timber Piles, (in.) Length ft Class A Tip Class B Tip Class C Tip3 ft From Butt 3 ft From Butt 3 ft From Butt Min Max Min Min Max Min Min Max Min CirDiaCirDiaCirDiaCirDiaCirDiaCirDiaCirDiaCirDiaCirDia Up to 50 47 15 57 18 28 9 38 12 63 20 25 8 38 12 63 20 25 8 Over 50 47 15 57 18 25 8 41 13 63 20 22 7 38 12 63 20 22 7
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