SECTION 719 - SIGNING MATERIAL
719.01 Reflective Sheeting The reflective sheeting shall cons ist of a retro-reflective
lens system having a smooth outer surface. The sheeting shall have a precoated adhesive on the back side, protected by an easily removable liner. The reflective sheeting and its components shall be NTPEP test ed and conform to all the requirements of FHWA ASTM D4956, Standard Specification for Retroreflective Sheeting for Traffic Control, including supplementary requirements. Engineering grade reflective sheeting shall meet the reflective intensity requirements of ASTM D4956, Standard Specification for Retroreflective Sheeting for Traffic Control, including supplementary requirements Type II sheeting. High intensity prismatic reflective sheeting shall meet the reflective requirements for ASTM D4956 Type III prismatic sheeting. Reflective sheeting, used in sign construction, shall be from the Department’s Qualified Products List and have been manufactured within the six months immediately prior to fabrication of each sign. Upon delivery at the job site of each shipment of signs, a letter of certification shall be provided by the Contractor that the reflective sheeting conforms to the requirements contained herein. Super high intensity fluorescent retro-reflective sheeting, ASTM D 4956 - Type VIII, or Type IX (prismatic), is required for all construction signs. Example Table Engineering Grade Type II High Intensity Type III 7-78 Work Zone Type VIII or Type IX (prismatic) For Type I Guide Signs, all reflective sheeting shall be color matched on each sign unit.
719.02 Demountable High Intensity 719.02 Demountable High Inte nsity Prismatic
Reflectorized Letters, Numerals, Symbols and Borders Demountable reflectorized letters, numerals, symbols and borders shall consist of cut out high intensity prismatic sheeting, be NTPEP tested and, conforming to FHWA, "Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects", 2014 FP-14 718.0.
719.03 Aluminum Extrusions The extruded aluminum planks shall be bolted type
with dimensions, holes, lengths, and cross sections as detailed on the plans. The extruded aluminum molding for edging of the extruded aluminum sign panels shall be of the cross section as detailed on the plans. Extruded aluminum planks shall conform to ASTM B 221, 606-T6, 6005-T5, or 6061-T6. The extruded aluminum planks and molding shall be free from all corrosion and dirt and the face and edges shall be true, smooth, and free from burrs and breaks.
a.Degreasing Required on aluminum plank by either of the following methods:
1.Vapor Degreasing shall be by total immersion of the plank in a saturated vapor of trichloroethylene or perchloroethylene. Trademark printing shall be removed with lacquer thinner or controlled alkaline cleaning system.
2.Alkaline Degreasing - Planks shall be immersed in a tank containing alkaline solutions, controlled and titrated to the solution manufacturer's specification. Immersion time shall depend upon the amount of soil present and the gauge of the metal.
b.Etching
1.Alkaline Etch The pre-cleaned aluminum surface shall be w ell etched in an alkaline etching material that is controlled by titration, use time, temperature and concentration specified by the solution manufacturer and rinsed thoroughly. Smut shall be removed with an acidic, chromium compound type solution as specified by the solution manufacturer and then thoroughly rinsed.
2.Alodine 500 or 1,200 is acceptable.
c.Drying Material may be air-dried or oven dried. Metal shall not be handled between all cleaning and etching operations and the application of Reflective Sheeting, except by devise or clean gloves. There shall be no opportunity for metal to be exposed to grease, oils, or other contaminants before application of Reflective Sheeting.
d.Fabrication All fabrication shall be completed before met al degreasing. 7-79
719.04 Aluminum Sheets All blanks shall be made of 5052-H38 o r 6061-T6
aluminum. The Contractor shall guarantee the material to be free of buckles, warp, dents, cockles, burrs and defects resulting from fabrication.
a.Degreasing Required on sheet aluminum by either of the following methods:
1.Vapor Degreasing Sign blanks shall be totally immersed in a saturated vapor of trichloroethylene or perchloroethylene. Trademark printing shall be removed with lacquer thinner or controlled alkaline cleaning system.
2.Alkaline Degreasing Sign blanks shall be totally immersed in a tank containing alkaline solutions, controlled and titrated to the solution manufacturer's specifications. Immersion time shall depend upon the amount of soil present and the gauge of the metal.
b.Etching
1.Alkaline Etch The pre-cleaned aluminum surface shall be w ell etched in an alkaline etching material that is controlled by titration, use time, temperature and concentration specified by the solution manufacturer, and rinsed thoroughly. Smut shall be removed with an acidic, chromium compound type solution as specified by the solution manufacturer and then thoroughly rinsed.
2.Alodine 500 or 1,200 is acceptable.
c.Drying Material may be air-dried or oven dried. Metal shall not be handled between all cleaning and etching operation and packaging, except by device or clean gloves. There shall be no opportunity for metal to come in contact with grease, oils, or other contaminants prior to application of the packaging and shipping.
d.Fabrication All fabrication, including shearing, cutting, and punching of holes, shall be completed before metal degreasing. Fabrication of all metal parts shall be accomplished in a uniform and skillful manner. The surface of all sign panels shall be flat. The minimum sheet thickness shall be 0.08 inches for signs of an area of 12 ft² or less and shall be 0.125 inches for signs over 12 ft² unless otherwise specified.
e.Chromate Treatment Treatment shall be in accordance with ASTM B 449 Class I.
719.05 Plywood The plywood shall conform to the following req uirements:
a.Face stock Face veneers shall be Grade A.
b.Core and Cross Veneers Core and crossband veneers shall be Grade B or better and shall be solid jointed. 7-80
c.Glue The entire area of each contacting veneer surface shall be bonded with a waterproof adhesive that meets the test requirements for exterior type.
d.Overlay The overlay shall be of the high-density type. It shall be a minimum of 60 lb/1,000 ft² surface, shall be at least 0.009 inches thick, and have a minimum resin content of 40 percent based on the dry weight of the impregnated fiber. It shall consist of at least 2 sheets of resin-impregnated fiber of sufficient resin content to bond itself to the plywood. Manufacturing precautions shall be taken to prevent overlay surfaces from coming into contact with any substance that would inhibit adhesion of paint or reflective sheeting. The overlay shall be natural color.
e.Thickness The thickness of plywood shall be ⅝ inch.
f.Testing The plastic overlay shall not delaminate from the plywood after being subjected to the exterior boiling test for glue line durability.
719.06 Demountable Reflectorized Delineators Delineators shal l be diamond
reflectors approximately 3 inch square or shall be rectangular, adhesive coated reflective sheeting permanently adhered to a sheet aluminum backing. All delineators on a project shall be the same type. Single delineators shall be clear or silver-white; double and triple delineators shall be amber.
a.Single delineators shall have one ¼ inch square hole for cen ter mounting. Double and triple delineators shall have two ¼ inch square mounting holes on the vertical centerline. Single delineators shall be 3 by 3 inches diamonds with ¾ inch radius corners and two ¼ inch square mounting holes, 3 inches on center. Double delineators shall be 3 by 6 inch rectangles with ¾ inch radius corners and two ¼ inch square mounting holes 5 inches on center. The aluminum shall be 6061-T6, ASTM B 209 or 6063-T6 or 6005-T5 0.063 inches thick sheet properly degreased and etched or treated with a light, tight amorphous chromate type coating. The reflective sheeting shall be applied to properly treated base panels with mechanical equipment in a manner specified by the sheeting manufacturer.
b.General Requirements and Packaging. The finished delineator s shall show careful workmanship, be free of burrs, scratches or damaged reflective surface. Delineators shall be packaged in such a manner as to insure their arrival at destination in undamaged condition. Delineators shall not become wet in storage or shipment. 7-81
719.07 Assembly and Mounting Hardware - General The attachment of signs shall be in
accordance with the contract documents and the appropriate hardware prescribed in this Section. Requests for substitution for all specified material shall be submitted in writing with full documentation, including but not limited to specifications and mill certification reports, enabling the Department to evaluate the proposal promptly. 719.071 Aluminum Planking The bolt assembly required to fasten the extruded aluminum planks together shall conform to the designs used in standard commercial processes for the selected type of extruded aluminum panels. Guidance for bolt hole punching and typical plank-to-plank attachment is provided in the contract documents. 719.072 Overhead Signing Sign panels mounted to independent sign support structures and support structure components mounted to bridges passing over the highway are considered to be overhead signing. Overhead signing shall be mounted on W6 by 9 steel beams conforming to the requirements of ASTM A 992/A 992M, galvanized in accordance with AASHTO M 111, or the same size aluminum beams conforming to ASTM B 221M, alloys and tempers of 6061-T6, 6063-T6 or 6005-T5. These components shall be horizontally spaced a maximum of 5¼ feet on center, extending from the bottom of sign panel to the top. If supplemental signs are included in the contract, these beams will extend from the bottom of the main sign panel to the top of the supplemental sign panel. The maximum distance from the edge of the sign to the center of the W6 by 9 shall not exceed approximately 3¼ feet. On independent sign support structures, these W6 by 9 beam components shall be fastened to chords with a pair of appropriately sized U-bolts on each side of the web at each fastening location. A similar pair of U-bolt assemblies shall be used in attaching each chord of an overhead component to upright supports. U-bolts for steel support structures shall conform to ASTM A 449, Type 1 or 2. The U-bolt hardware, which includes nuts, flat washers and helical lock washers, shall be galvanized in accordance to AASHTO M 232 (ASTM A 153 or B 695, Class 50, Type 1). Washers shall conform to the requirements of ASTM F 436. The U-bolt material for aluminum support structures, or a combination of steel and aluminum structural components, shall be stainless steel conforming to the requirements of ASTM F 593, alloy group 1, with a minimum yield strength of 45 ksi. Steel support structures may also utilize stainless steel hardware assemblies as an alternative to galvanized steel. Nuts shall be of the locking type with nylon inserts. Washers shall conform to the requirements of ASTM A 276, Type 302. Flat washers, without helical lock washers, will be acceptable in this stainless steel assembly. On bridge mounted structures, the fastener configurations shall be depicted in the contract documents. 719.073 Post Clip Hardware For Overhead Signing Signs mounted steel or aluminum W shape beam components shall be attached using post clip hardware as described in this Section as well as the contract documents. Overhead signing shall have post clip assemblies fastened in pairs, one on each side of the web of the W shape beam, at all locations on the 7-82 backside of the extruded plank panels that provide a groove accommodating a post clip bolt and assembly. Post clips shall be 356-T6 aluminum conforming to the requirements of ASTM B 108. The post clip bolt material for overhead signing shall be stainless steel conforming to the requirements of ASTM A 193/A 193M, AISI Type 304, Grade B8. The post clip bolt nut shall be stainless steel material con-forming to the requirements of ASTM A 194/A 194M, AISI, Type 303, Grade 8F and of the locknut type with nylon inserts. Flat washers of these assemblies shall be stainless steel material conforming to the requirements of ASTM A 276, Type 302. 719.074 Post Clip Hardware For Roadside Signing Signs mounted on other than overhead locations may be mounted using aluminum hardware. The aluminum post clips shall be 356T-6 aluminum conforming to the requirements of ASTM B 108. The post clip bolts, washers and nuts shall conform to the requirements of aluminum alloy 2024-T-4 (bolts and washers) and alloy 6061-T6 or 6262-T9 (lock nuts). 719.075 Roadside Signing Aluminum signs mounted on U-channel posts shall be fastened with 5/16 by 1½ inch stainless steel bolts, washers, and self-locking type nuts. The bolts shall conform to the requirements of ASTM F 593. A washer, either a white nylon or neoprene or stainless steel ASTM F 593 shall be used between the head of the bolt and the face of the sign. Plywood signs mounted on U-channel posts shall be fastened with 5/16 by 2½ inch stainless steel cap screws and hex nuts conforming to ASTM F 593, and a washer either white nylon or neoprene or stainless steel ASTM F 593 shall be used between the head of the bolt and the face of the sign. Delineator assembly hardware shall consist of ¼ by 2¼ inch stainless steel bolts, washers, and self-locking type nuts. The bolt assembly shall conform to the requirements of ASTM F 593.
Referenced in this section
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Source: Standard Specifications — Highways and Bridges, 2020 Edition. Pages 782–787 of 817. View official source ↗