High Density Overlay Plywood

2026-11-03

High Density Overlay Plywood . Panels must meet the requirements of the U . S . Product Standard PS - 1 - 83 for Group 1 wood species , Grade B - B veneer , exterior type , high - density overlaid plywood . Deliveries will be made to the MDOT Central Warehouse . This contract is for 3 years , with 2 , 1 - year renewal options . 919 . 01 . General Requirements Permanent traffic signs and sign support material must meet the requirements of the MDOT Sign Support Standard Plans and this section . 919 . 02 . Traffic Signs The Department classifies signs by type of sign panel material and type of sign face , as follows : Table 919 - 1 : Sign Panel and Face Types Sign Panel Type Material Size Limits I Aluminum extruded sections Height > 48 inches or width > 120 inches II Plywood Height = 48 inches and width = 24 inches Minimum height ≥ 36 inches and width ≥ 36 inches Maximum height ≤ 48 inches and width ≤ 120 inches III 0 . 080 inch aluminum sheet ( a ) 36 by 36 inches IV 0 . 040 inch aluminum sheet ( a ) Overlay V 0 . 125 inch aluminum sheet ( a ) 48 by 48 inches and as shown in MDOT ’ s SIGN - 100 series Sign Face Type Background Legend and Border A Reflectorized Reflectorized B Reflectorized Non - reflectorized C Non - reflectorized Reflectorized ( a ) Round the corners and remove burrs at the corners and mounting holes . A . Sign Panel Material and Fabrication 1 . Aluminum Extruded Sections . Provide aluminum extruded sections in a variety of widths with plain butt - type edges for connecting to adjoining horizontal sections . Sections must be one piece with no vertical splices and have a cross - sectional shape meeting the minimum requirements specified in Table 919 - 2 . Sections must have at least a 0 . 125 - inch nominal thickness . Exterior corners must have a radius of at least 0 . 040 inch . Sign panel sections must be extruded aluminum alloy 6063 - T6 meeting the requirements of ASTM B221 . Panel sections , after fabrication , must be flat to within 0 . 031 inch or less per foot of length and to within 0 . 004 inch or less per inch of width . Table 919 - 2 : Cross - Sectional Requirements for Aluminum Extruded Sign Sections for Type I Sign Panels Length of Sign Support Type Moment of Inertia Section Modulus Elements of Cross Section No Free Ends One Free End b / t ≥ I / y b / t ≥ I / y ≤ 30 feet on columns ≤ 20 feet on cantilevers ≤ 30 feet on trusses ≥ 0 . 94 W ≥ 0 . 55 W 8 – 50 56 . 0C 5 – 28 32 . 0A > 50 3 . 4D > 28 11 . 6B Notes : b = compression width of stiffener elements in inches t = thickness of the stiffener element in inches I = moment of inertia of the sign section in inches y = distance from the neutral axis to the centroid of the compression width of the element W = width of the sign section in feet A = W /( 63 - b / t ) B = 1 . 0 × 10 − 4 W ( b / t ) ² C = W /( 111 - b / t ). D = 1 . 0 × 10 − 4 W ( b / t ) ² Degrease aluminum extruded sign panel sections in accordance with the sheeting manufacturer ’ s recommendations . After degreasing , surface treating , and rinsing , maintain sign panels free of grease , oil , or other contaminants . Connect the sections horizontally with ⅜ - inch diameter stainless steel bolts , spaced as shown on the MDOT Sign Support Standard Plans . Section connections or sign - to - post connections must have no fasteners that project through the sign panel face . Position the plank second from the bottom of the sign .

MITN

2026-04-29