910.1 General Description
This section includes the requirements for fabricating and applying messages on sign blanks, laminated panels, and extruded panels.
910.1.01 Related References
A. Standard Specifications Section 107—Legal Regulations and Responsibility to the Public Section 911—Sign Posts Section 912—Sign Blanks and Panels Section 913—Reflectorizing Materials Section 914—Sign Paint Section 915—Mast Arm Assemblies Section 917—Reflective and Nonreflective Characters B. Referenced Documents Manual on Uniform Traffic Control Devices (MUTCD)
910.2 Materials
Use the dimensions, colors, and reflectorizing as specified in the Plans, Proposal, and Manual on Uniform Traffic Control Devices (MUTCD). The materials requirements are as listed below: Material Section Posts for Groundmounted Signs 911 Aluminum Sign Blanks 912.2.01 Extruded Aluminum Sign Panels 912.2.02 Reflective Sheeting 913.2.01 Silk Screen Lettering Paint 914.2.01 Mast Arm Assemblies 915 Demountable Characters with Type VI Reflective Sheeting 917.2.01 Direct Applied Non-Reflective Characters 917.2.02 1. Handle the clean metal blanks and panels with either a mechanical device or with clean cotton gloves before applying any paint. 2. After the final metal treatment, protect the blanks and panels at all times from contact or exposure to greases, oils, dusts or other contaminants. 3. Get approval for all materials used to fabricate the finished signs according to these Specifications.
910.2.01 Painted Signs
A. Requirements 1. Use paint in fabricating these signs that meets the requirements in this Specification and is of the type specified. 2. Do not paint sign blanks or panels on which reflective sheeting shall be applied. B. Fabrication 1. Coat the sign blanks or panels on one face and all the edges with one coat of primer. Allow the primer to dry thoroughly. 2. Apply a coat of the specified enamel to the primed face and edges. a. Ensure the film is 2.5 mils, ± 0.5 mils (60 µm, ± 10 µm) thick when dry. Determine the thickness with a suitable gauge accurate to 0.1 mil (3 µm). b. Apply the paint with either sprayers or rollers. 3. Ensure that the finished paint surface is smooth, uniform, and exhibits neat work quality. 4. Ensure that the paint does not run, curdle, or separate after application. C. Acceptance The Department will reject any sign panels or blanks with paint that is not of the proper thickness, or with paint that has run, curdled, or separated after application. D. Materials Warranty General Provisions 101 through 150.
910.2.02 Reflective Sheeting Signs
A. Requirements Use materials that meets the requirements of these Specifications and is of the type specified. B. Fabrication 1. Apply the reflective sheeting to the face of the sign blank or panel with either an approved vacuum applicator, using a combination of vacuum and heat, or an approved roller process, using heat when necessary. 2. Apply the specified sheeting type and level of reflectivity according to the sheeting manufacturer’s recommendations. 3. Splice the sheeting on a sign according to the sheeting manufacturer’s recommendations. 4. Age the sheeting for 48 hours. C. Acceptance After applying the sheeting properly, test the adhesion to ensure it produces a durable bond equal to or greater than the strength of the reflective sheeting. 1. Ensure that the adhesion is strong enough to resist stripping from the blank when tested with a stiff putty knife. 2. Ensure that no air pockets or bubbles exist between the sheeting and the sign blank. D. Materials Warranty General Provisions 101 through 150.
910.2.03 Message
A. Requirements Ensure that all finished signs have the following characteristics: • The signs are clear-cut • The lines of all letters and details true, regular, and free from all waviness, unevenness, and furry edges or lines • The signs do not have scaling, cracking, pitting, blistering, dents, or blemishes of any kind • The size, style, and spacing of the letters, numerals, symbols, and borders used to convey the message are according to the details shown in the MUTCD and on the 9lans. See Subsection 107.03, Patented Devices, if patented materials are used. B. Fabrication Ensure that the legends and borders have one coat of silk screen paint as per Subsection 914.2.01. 1. Apply legends and borders by using one of the following processes: • Silk screening • Reverse screening • Directly applying nonreflective, durable, glossy plastic film that meets the requirements of Section 917. 2. Air-dry or oven-bake the sign at a temperature that will not affect the sign. 3. Demountable legends and borders may be used where approved by the Engineer. NOTE: Attach all demountable legends (letters, numerals, symbols, and borders) to the sign face with pull-through rivets recommended by the manufacturer. C. Acceptance The Department will accept finished signs based on quality of workmanship and accuracy of dimensions and message. D. Materials Warranty General Provisions 101 through 150.
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