ITEM 648 SPRAY THERMOPLASTIC PAVEMENT MARKING
648.01 Description. This work consists of furnishing and applying spray thermoplastic pavement
markings according to Item 641, 740.01, 740.09, 740.10, and the additional requirements specified below.
648.02 Materials. Furnish materials conforming to:
Spray Thermoplastic Pavement Marking ...................... 740.10 Glass beads, Type C ........................ 740.09 The Engineer may obtain random samples from the application equipment in accordance with Supplement 1089. Furnish the manufacturer’s identification information for the sampled materials. The Department will test the quality assurance sample for conformance to the manufacturer’s production ranges. Samples not meeting the manufacturer’s production ranges will require the Contractor to re- apply, at his expense, any markings using that sample. All other untested batches will become not approved materials and will either require testing or re-application. Do not apply material that has exceeded the manufacturer’s shelf life. Do not use glass beads that are wet.
648.03 Equipment. Equip all striping equipment for center line, lane line and edge line markings
with a computerized Data Logging System (DLS) conforming to 641.04 when the length of marking exceeds 0.5 mile (0.8 km) of continuous line equivalent. Ensure that the application equipment applies lines with a square end and can apply broken lines. Furnish application equipment for applying spray thermoplastic markings that produces different widths of lines. Use equipment that ensures uniformity in the thickness and width of lines. Use equipment that forms lines 8 inches (200 mm) wide or less by one application pass.
648.04 Surface Preparation. Before applying spray thermoplastic the pavement surfaces must be
clean, dust free, and completely dry. Apply spray thermoplastic to new pavement, over existing thermoplastic, or over one application of paint. Do not apply spray thermoplastic over epoxy, polyester, or preformed markings. Remove poorly adhering, flaking and loose markings and curing compounds. Use an air blast, or manual or mechanical broom to prepare surfaces. When more effort is needed to obtain a surface free from adhering, flaking and loose markings and curing compounds, use water blasting or mechanical removal.
648.05 Application. If applying spray thermoplastic to pavements that are less than six months old,
ensure that both the pavement surface and the ambient air temperature at the time of application are not less than 50 °F (10 °C) and rising. However, if applying spray thermoplastic to pavements that are older than six months, ensure that both the pavement surface and the ambient air temperature at the time of application are not less than 70 °F (21 °C) and rising. Ensure that the temperature of spray thermoplastic at the point of application is at least 375 °F (191 °C) and not more than 425 °F (218 °C). Apply spray thermoplastic at a thickness of 45 mil (1.15 mm) at the following rates: 45 Mil Thickness Line width (inch) 4 6 8 12 Pounds per Mile of Line Solid Line 762-886 1143-1329 1524-1772 2286-2658 Broken or Dotted Line 191-222 286-332 381-443 572-666 1.15 mm Thickness Line Width (mm) 100 150 200 300 Kilogram per Kilometer of Line Solid Line 209-242 313-364 417-485 626-728 Broken or Dotted Line 52-61 79-92 104-121 158-184 Mechanically apply glass beads to the wet spray thermoplastic surface so that the beads are embedded and retained and provide uniform retroreflectivity in the surface. Apply beads at a minimum rate of 10 pounds per 100 square feet (4.9 kg per 10 m²) of spray thermoplastic surface area. Use primer when required by the manufacturer. Apply primer according to the manufacturer’s recommendations. For each route section on the DLS report, the Engineer will compute the amount of spray thermoplastic marking material and glass beads applied. The Department will reduce the contract price in direct proportion to the percent of deficiency of spray thermoplastic marking material or glass beads as specified in 648.05, up to 20 percent for each material deficiency. The Department will only use the greater deficiency of marking material or glass beads to compute the deduction. The Department will consider materials unsatisfactory if at least one of the following conditions is met:
A.Deficiency of spray thermoplastic marking material or glass beads is 20 percent or more.
B.Materials applied outside the temperature or application requirements in 648.05 without written approval of the Engineer.
C.Markings not meeting the performance parameters contained in Supplement 1047, Appendices C, D, E, and G.
1.Numerical rating of 8 or lower for Daytime Color (Appendix C)
2.Composite rating of 8 or lower for Night Visibility (Appendix D)
3.Numerical rating of 9 or lower for Durability (Appendix E)
4.Less than the initial measurement for Retroreflectivity (Appendix G) Replace or reapply spray thermoplastic markings and glass beads in all sections determined to be unsatisfactory. Furnish the Engineer daily DLS reports conforming to 648.03, and additional reports indicating material type and quantities in pounds (kilograms) of spray thermoplastic materials used, as per 641.04.
648.06 Basis of Payment. The Department will not pay for any spray thermoplastic lines that do not
meet the required thickness. The Department will pay for accepted quantities at the contract prices, or prices adjusted according to 648.05, measured according to 641.12, with the provisions specified in 641.13, and as follows: Item Unit Description 648 Mile (Kilometer) Edge Line, ___ inch (___ mm) 648 Mile (Kilometer) Lane Line, ___ inch (___ mm) 648 Mile (Kilometer) Center Line 648 Foot (Meter) Channelizing Line, ___ inch (___ mm) 648 Foot (Meter) Dotted Line, ___ inch (___ mm) 648 Foot or Square Foot Removal of Pavement Marking (Meter or Square Meter), or Each 648 Lump Sum Two-Way Radio Equipment 650 ROADSIDES
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Source: Construction and Material Specifications, 2023 (rev. 7/17/2026) Edition. Pages 617–620 of 892. View official source ↗