Sign Panel Overlay Art. 721.03
c.Sign Legends (Note 2) ............................................................................ 1091
d.Overlay Panels (Note 3) .................................................................... 1090.02 Note 1. The sign face shall be Type A. Note 2. The legend shall be Type A, except when black in color. Note 3. The overlay panels shall be 0.08 in. (2 mm) thick. CONSTRUCTION REQUIREMENTS
721.03 General. The existing sign shall be stripped of the sign legend, and
the sign panel overlay and new legend shall be installed on the existing sign base. Ground-mounted sign panels may be taken down or the required work may be done in place. Any sign panel which is removed for overlaying shall be rigidly braced on the backside so the panel shall not flex and damage the overlay while being reinstalled. Sign panel hardware broken during removal of a sign panel shall be replaced. The existing legend shall be completely removed, leaving no rivets protruding from the surface of the panel. The overlay shall be applied in vertical panels not more than 48 in. (1200 mm) nor less than 24 in. (600 mm) in width. Adjacent panels shall be butt-joined with the spaces between joints 0.10 in. (2.5 mm) or less in width. No horizontal joints shall be used, except on sign panels over 12 ft (3.6 m) in height. The panels shall be securely fastened to the sign with 3/16 in. (4.75 mm) aluminum dome head rivets with aluminum mandrels. All rivets shall be matched to the color of the overlay panel being installed. The rivets shall be placed at 12 in. (300 mm) centers or less along all four edges and in a vertical row down the center of the panel at 24 in. (600 mm) centers or less. The rivets shall be approximately 1/4 in. (6 mm) in from open edges. All rivets shall be placed in the area of the aluminum extrusion panel ridge to prevent dimples in the sign panel overlay. The sign sizes and legend sizes shown in the plans shall be verified in the field by the Contractor. The replacement legend shall be the same size and shall be spaced the same as the existing sign. The Contractor shall be responsible for the correct spacing of any revised legend according to the general freeway signing practices. Individual signs shall not be out of service for longer than 24 consecutive hours, subject to the following conditions and exceptions.
a.No more than one advance guide sign of the sequence of signs on an approach to an interchange shall be out of service at any given time. (These signs are labeled "A" in the plans.)
b.Signs labeled "B" may be out of service at the same time as any other signs. Art. 721.04 Sign Panel Overlay
c.Signs labeled "C" are considered critical and shall be out of service no more than six consecutive hours and shall not be out of service when any "A" sign for the approach is also out of service.
721.04 Method of Measurement. The sign panel overlay will be measured
for payment in square feet (square meters). The area used for measurement shall be the actual area of the sign panel overlay.
721.05 Basis of Payment. This work will be paid for at the contract unit price
per square foot (square meter) for SIGN PANEL OVERLAY. SECTION 722. DEMOUNTABLE SIGN LEGEND CHARACTERS AND ARROWS
722.01 Description. This work shall consist of furnishing demountable legend
characters, arrows, symbols, and route shields and installing them on existing sign panels.
722.02 Materials. Materials shall be according to Article 1091.02 for sign
legend specified for Type 3 sign panels. CONSTRUCTION REQUIREMENTS
722.03 General. Each demountable legend unit shall be securely fastened to
a previously prepared sign panel.
722.04 Basis of Payment. Demountable sign legend characters, arrows,
symbols, and route shields will be paid for at the contract unit price per each for DEMOUNTABLE LEGEND CHARACTERS AND ARROWS. Borders, diagonals, periods, commas, hyphens, and apostrophes will not be paid for separately. Auxiliary panels will be paid for according to Article 721.05. SECTION 723. INSTALL EXISTING SIGN PANEL
723.01 Description. This work shall consist of installing an existing sign
panel on a previously erected sign support(s) or sign structure. CONSTRUCTION REQUIREMENTS
723.02 General. The existing sign panel shall be transported by the
Contractor to the location specified in the contract and installed on the previously erected sign support(s) or sign structure according to the details shown in the plans or as directed by the Engineer.
723.03 Method of Measurement. This work will be measured for payment in
square feet (square meters) according to Article 720.03.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 652–653 of 1,217. View official source ↗