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NASHUA
March 13, 2017
SPECIALPROVISION
Item 1001.5 — Metal Deck Form and Structural Steel Clean and Paint
Description
1.1 This work shall consist of cleaning and galvanizing/painting corroded material from the
galvanized corrugated metal deck forms and painted structural steel within approximately three
feet of the bridge supports as directed by and to the satisfaction of the engineer.
Construction
2.1 The cleaning method used shall not damage the underlying concrete deck, or structural
steel members of the truss. Any damage to the deck or truss caused by the cleaning shall be
repaired as directed by the engineer and at the contractor’s expense.
2.2 Galvanized metal deck forms shall be cleaned and the galvanizing repaired per Section
550.2.9.1 of the NHDOT Standard Specifications.
2.2.1 Amend 550.2.9.1.2 to read: Repair damaged galvanizing and bare steel surfaces in
accordance with ASTM A780, Standard Practice for Repair of Damaged Hot Dipped
Galvanized Coatings, Annex 2. Thoroughly clean damaged areas to produce a clean, bare
and dry bright metal surface with a roughened profile and feather into the edges of
adjacent undamaged galvanizing. Cleaning shall conform to the requirements of the
Society for Protective Coatings (SSPC) SP11 — Power Tool Cleaning to Bare Metal.
2.3 Structural steel cleaning shall conform to the requirements of SSPC-SP11 — Power Tool
Cleaning to Bare Metal.
2.4 Field Painting of the structural steel shall conform to the requirements of Section 556 of the
NHDOT Standard Specifications.
2.4.1 Paint System shall match the existing or an approved equal. Approved equal shall
conform to the NEPCOAT Qualified Products List A or B. Per the existing plans the
paint system consists of:
A. Primer Coat: Carbomastic 242 high-build, aluminum-filled epoxy urethane mastic as
manufactured by Carboline Coatings. Dry film thickness to be 5 mils.
B. Top Coat: Carboline 133 HB aliphatic polyurethane as manufactured by Carboline
Coatings. Dry film thickness to be 5 mils. Color to be Federal Standard 20059.
Nashua / 16-0186 / 3/13/2017
