7-92 SECTIO N 726 – PROTECTIV E COATING S AND WATERPROOFIN G MATERIALS 726.0 1 TIMBE R PRESERVATIVE . Preservatives and pressure treatment processes for lumber and timber shall conform to the requirements of AASHTO M 133 or AWPA Standard U1 . Wood components shall be treated in accordance with AWPA Standard U1 to the requirements of the applicable use cat egory as specified in Table 726.01A . TABLE 726.01A – AWPA PRODUCT USE CATEGORIES AND COMMODITY SPECIFICATIONS Component AWPA Use Category AWPA Commodity Specification Sawn guardrail post UC4B A Sawn bollard, marker post, guide post, sign post, or fence post UC4A A Sawn structural lumber and timber UC4B A Sawn nonstructural lumber UC4A A Sawn timber cribbing UC4B A Structural glued laminated timber UC4B F Round fence post UC4A B Round timber pole UC4B D Any field treatment required by the Engineer shall be performed in accordance with the provisions of AWPA Standard M4 . Prior to the delivery of preservative material, a copy of the safety data sheet for the product shall be provided to the Engineer. 726.0 2 MINERA L SPIRITS . Mineral spirits shall conform to the requirements of ASTM D235 . 726.0 3 WATERPROOFIN G PITCH . Waterproofing pitch shall conform to the requirements of ASTM D450, Type II. 726.0 4 WOVE N COTTO N FABRIC . Bitumen -saturated woven cotton fabric shall conform to the requirements of ASTM D173 . 726.0 5 WOVE N GLAS S FABRIC . Coated woven glass fabric shall conform to the requirements of ASTM D1668 . 7-93 726.0 6 GALVANIZING . Surfaces to be galvanized shall be zinc -coated in conformance with AASHTO M 111 or, when applicable, AASHTO M 232 . Zinc coating that has been damaged shall be repaired in accordance with ASTM A780 , Annex A2 . The paint used in the repair shall be organic rich, containing a minimum of 92% zinc by weight in the dry film. The paint shall be applied per the manufacturer’s recommendations to a thickness equivalent to the surrounding zinc coating. 726.0 7 METALIZING . Surfaces to be metalized shall be prepared and coated in accordance with AASHTO/NSBA S8.2 , SSPC -PA 18 , and the following:
a.The coating shall be zinc with a minimum purity of 99.9%.
b.All surfaces to be thermal sprayed shall be blast -cleaned to white metal immediately prior to metalizing. The final surface appearance shall be equivalent to SSPC -SP 5 supplemented by SSPC - VIS 1 . All surfaces shall also have a uniform surface profile of 3.5 mils to 5.5 mils. If the profile requirements of the coating man ufacturer are more restrictive, the fabricator shall advise the Structural Steel Fabrication Engineer and comply with the more restrictive requirements. The surface profile produced by the fabricator’s surface preparation procedures shall be determined by replica tape and spring micrometer at the beginning of the work, and each day that the surface preparation is performed. The replica tape shall be attached to the daily inspection records. Areas having unacceptable measurements shall be further tested to determine the limits of the deficient area and subsequently corrected to meet specification requirements.
c.Thermal spray coating (TSC) shall be applied within six hours of completing blast cleaning. If this time is exceeded, or rust appears on the surface, the steel surface shall be properly prepared again. A thermal spray coating 8 mils to 12 mils thick shall be applied to all exte rior surfaces. Internal surface s shall have a coating with a minimum thickness of 2 mils.
d.Exterior surfaces (except faying surfaces) shall be sealed with an approved sealant conforming to the sealant manufacturer’s recommendations for the TSC applied. The sealant name, manufacturer, and product data sheets shall be included with the submittal for the metalizing procedure. Unless otherwise specified in the Contract, a top coat will not be applied over the seal coat, and therefore the seal coat shall be ultraviolet resistant. The dry film thickness of the sealant shall be 1 mil to 2 mils. The sealant shall be applied within 8 hours of completing the TSC application. 7-94 (e) In addition to the requirements above, the following shall also apply:
1.QA witnessing of job reference standards is required, when applicable .
2.Companion coupons shall be used in lieu of destructive testing on the work piece, except when a test failure occurs. If more than one thermal spray equipment setup is to be used in production, the frequency requirements apply to each one.
3.Bend tests shall be performed for each thermal spray unit. The tests shall meet the requirements of AWS C2.23 .
f.Inaccessible areas, as well as metalizing that has been damaged in the field, shall be repaired in accordance with Subsection 726.0 6. The repair coating shall be brush applied.
726.08 WATERPROOFIN G MEMBRAN E SYSTEMS . Waterproofing membrane systems shall be one
of the products listed on the Agency’s Approved Products List and shall meet the following requirements for the respective material specification :
a.Waterproofing Membrane System, Type I . Type I waterproofing membrane system shall be a Type I cold applied elastomeric system in accordance with ASTM D6153 .
b.Waterproofing Membrane System, Type II . Type II waterproofing membrane system shall be a Type II hot applied elastomeric system in accordance with ASTM D6153 .
c.Waterproofing Membrane System, Type III . Type III waterproofing membrane system shall be a preformed sheet system intended for below -grade applications and shall meet the following requirements:
1.Permeability . Permeability shall meet the requirements of ASTM D6153 , Table 1 .
2.Adhesion . The system shall be self -adhering .
726.09 ANTI -GRAFFITI COATING . Anti -graffiti coatings shall be concrete, masonry, or natural stone
coatings that aid in the removal of graffiti. Anti -graffiti coating for concrete shall be in accord ance with ASTM D7089 , Cleanability Level 1.
726.10 WATER REPELLENT, SILANE . Silane w ater repellent shall be in accordance with AASHTO M
244 and shall be one of the products listed on the Agency’s Approved Products List .
a.Type I . Type I silane water repellent shall have a minimum active silane content of 40% .
b.Type II . Type II silane water repellent shall have an active silane content of 100%. 7-95 SECTIO N 727 – FENCIN G MATERIALS
727.01 WOVEN WIRE FENCE . Woven wire fence shall meet the following requirements:
a.Woven Wire Fabric for Fencing and Gates . Woven wire fabric shall be Design Number 939 -6-11 or Design Number 939 -6-12 1/2 in accordance with AASHTO M 279 , Grade 60. Woven wire fabric shall have a Type A coating or Type Z Class 3 coating and may have a hinge joint or continuous stay fixed knot joint.
b.Barbed Wire . Barbed wire shall be Design Number 12 -4-5-14R in accordance with AASHTO M 280. Barbed wire shall have a Type A coating or a Type Z coating.
c.Wood Posts and Braces . Round wood posts shall be seasoned red (Norway) pine or southern pine, straight, sound, and cut from live timber. If round posts are used, they shall conform to the diameter and length shown on the Plans. In all cases, they shall be not less than 4-1/2 inches in diameter at the small end after removal of the bark. They shall be shaved to an even surface and be free from bark or skin. If sawn posts are used, they shall be rough -sawn and conform to the requirements of Subsection
728.01 The nominal dimensions shall be at least 4 inches square and of the length shown on the
Plans. The types of wood to be used for bracing shall be similar to those required for the posts. The braces shall conform to the dimensions shown on the Plans. All wood po sts and braces shall be pressure treated in accordance with Subsection 726.01 . Any cut portions shall receive a field application in accordance with AWPA Standard M4 .
d.Steel Posts and Braces . Line posts shall be standard commercial T -type steel posts co nforming to the requirements of AASHTO M 281 . End posts, corner posts, pull posts, bracing, and anchor plates shall conform to the requirements of AASHTO M 281 . Intermediate posts or line posts shall be provided with an anchor plate having a length or widt h of 4 inches to 5 inches with a net area of not less than 20 square inches. All posts, braces, anchors, plates, and other metal fittings shall be zinc coated on all inner and outer surfaces in accordance with the requirements of AASHTO M 111 or AASHTO M 2 32, whichever is applicable.
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 1244–1246 of 1,380.