2010 Construction and Material Specifications - Ohio Department of ...

514.20
F. Measure other areas or revise the number of spot measurements as shown on
the plans.
Each coat of paint shall have the following thickness measured above the
peaks:
Prime
Intermediate
Subtotal
Finish
Total
Min.
Spec.
Thickness
3.0 mils
(75 µm)
5.0 mils
(125 µm)
8.0 mils
(200 µm)
2.0 mils
(50 µm)
10.0 mils
(250 µm)
Max.
Spec.
Thickness
5.0 mils
(125 µm)
7.0 mils
(175 µm)
12.0 mils
(300 µm)
4.0 mils
(100 µm)
16.0 mils
(400 µm)
Min.
Spot
Thickness
2.4 mils
(60 µm)
4.0 mils
(100 µm)
6.4 mils
(160 µm)
1.6 mils
(40 µm)
8.0 mils
(200 µm)
Max. Spot
Thickness
(Inorganic Zn)
6.0 mils
(150 µm)
10.5 mils
(263 µm)
16.5 mils
(413 µm)
6.0 mils
(150 µm)
22.5 mils
(563 µm)
Max. Spot
Thickness
(Organic Zn)
7.5 mils
(188 µm)
10.5 mils
(263 µm)
18.0 mils
(450 µm)
6.0 mils
(150 µm)
24.0 mils
(600 µm)
Remove paint with a film thickness greater than the maximum specified
thickness unless:
A. The paint does not exhibit defects such as runs, sags, bubbles, or mud
cracking, etc.
B. The manufacturer provides a written statement to the Engineer that the
excessive thickness is not detrimental.
For any spot or average of five spots at any location of a 100-square foot (9 m 2 )
area that exceeds the maximum spot thickness, either remove and replace the
coating according to 514.22 or prove to the Office of Construction Administration
that the excess thickness will not be detrimental to the coating system. In order to
prove to the Office of Construction Administration that the excess thickness will
not be detrimental to the coating system, the Contractor must provide the Office of
Construction Administration with the following information.
Certified test data proving that the excessive thickness will adequately bond to
the steel when subjected to thermal expansion and contraction. The thermal
expansion and contraction test shall take place over five cycles of a temperature
ranges from -20° to 120 °F (-49° to 49°C). After the thermal contraction and
expansion cycles have taken place, the tested system shall be subjected to pull off
tests and the results compared to the results of pull off tests that have been
performed on a paint system with the proper thicknesses. In addition to the
certified test results, the Contractor shall provide the Office of Construction
Administration a written statement from the paint manufacturer stating that the
excessive thickness is not detrimental.
If the Office of Construction Administration does not approve the excessive
coating thicknesses or the Contractor elects not to provide the required written
statement from the paint manufacturer and the certified test results when required,
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