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Railroad
Grating
Duo-Grip
Specifications
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Product Specification Guide
How to Specify:This information is designed to conform to the requirements of the Three-Part Section Format of the CSI/CSC Master Format for construction specifications. These specifications are intended to be used as a guideline for architects and engineers as they establish the requirements for a particular project, and may be modified by them as deemed appropriate. PART 1: GENERAL
The contractor shall provide all labor, materials, equipment and incidentals as shown on drawings and specified on contract documents and are required to furnish and install grating, stair treads and supports. 1.2 Quality Assurance A . Comply with applicable provisions and recommendations of the following: NAAMM Metal Bar Grating Manual designated ANSI/NAAMM MBG 531 for Steel, Stainless Steel and Aluminum Gratings and Stair Treads. B . Steel Grating: The steel used in the Bearing Bars and Cross Bars shall be of Rectangular section and conform to ASTM A569 Hot Rolled Carbon Steel Sheet and Strip. C. Aluminum Grating: The aluminum used in the Bearing Bars shall be either alloy 6061-T6 or 6063-T6 conforming to ASTM B221. The aluminum used in the Cross Bars shall be alloy 6063-T5 conforming to ASTM B221. D. Stainless Steel Grating: The stainless steel used in the Bearing Bars and the Cross Bars shall be of rectangular section and either Alloy Type 304, 304L, 316 or 316L as determined by the engineer. E. Substitution of materials shall not be accepted unless they are submitted for review and the Architect/Engineer approves their use. 1.3 Submittals
PART 2: PRODUCT2.1 General
B. Bearing Bars: Material shall be of steel, aluminum or stainless steel as specified and shall be spaced 1 3/16" on center, close tolerance slotted to accept the cross bars. They shall be rectangular in shape and be of the appropriate depth and thickness for the required load. Other available centers are; (15/16"; 13/16";11/16"; 5/8"; ½" and 7/16") which may be selected at the discretion of the Architect/Engineer. C. Cross Bars: Material shall be of steel, aluminum or stainless steel as specified, rectangular in shape, close tolerance slotted and then and press-locked into the bearing bars under high hydraulic pressure. They shall be spaced on 4" centers or 2" centers as selected by the Architect/Engineer. D. Surface: The bearing bars shall have a smooth top surface unless the Architect/Engineer determines the need for a serrated surface. E. Loading: At a uniform load of 100 pounds per square foot, deflection shall not exceed ¼ inch over the required span. F. Finish: Steel shall be painted with a shop coat of manufacturer's standard black paint or may be galvanized as determined by the Architect/Engineer. Aluminum and stainless steel grating shall be mill finish as fabricated (MFAF). PART 3: EXECUTION3.1 Shop Fabrication
B. All required cutting, fitting and welding shall be performed in the manufacturers shop in accordance with the approved shop drawings and shall be in compliance with the NAAMM Metal Bar Grating Manual tolerances and welding standards. C. The finish coating, paint or galvanizing shall be applied after all of the required fabrication is complete. 3.2 Installation A. The grating shall be received at the job site by the contractor, unloaded and protected from damage prior to the requirement for it to be installed. B. The installing contractor shall prepare the site for installation, determining that deviations from the approved drawings are corrected prior to grating placement. C. Grating shall be installed in accordance with the approved shop drawings and the installation clearances called for in the NAAMM Metal Bar Grating Manual, including the use of the prescribed anchor system. D. Pipe penetrations of 4" or less shall be cut in the field. When installed, Grating Cross Bars shall be in alignment. |
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1.1 Scope of Work 
A. Grating shall be Amico Press-Locked Type 19-P-4 Bar Grating as manufactured by Alabama Metal Industries Corp. or approved equal. 
A. All required cutting, fitting and welding shall be performed in the manufacturers shop in accordance with the approved shop drawings and shall be in compliance with the NAAMM Metal Bar Grating Manual tolerances and welding standards.