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G12 Isolated structural metal members

FABRICATION

510 FABRICATION OF STEEL MEMBERS
• Cuts and holes: Accurate and neat.
• Welding: Metal arc method to BS EN 1011-2.
- Welded joints: Fully fused, with mechanical properties not less than those of the
parent metal.
- Site welding: Obtain approval.
• Joints: Location and layout of fastenings as drawing site specific.

EXECUTION

610 INSTALLATION
• Accuracy: Members positioned true to line and level using, if necessary, steel packs
of sufficient area to allow full transfer of loads to bearing surfaces.
• Fixing: Use washers under bolt heads and nuts.
- Tapered washers: Provide under bolt heads and nuts bearing on sloping surfaces.
Match taper to slope angle and align correctly.

620 BONDED ANCHORS
• Holes: Clean and free from dust at time of installing anchor.
• Permeable sleeves: Use in conditions where otherwise the loss of bonding agent
would be unacceptably high.
• Other requirements: 24 hours after installation, tighten anchors in masonry to
installation torque. Report movements..

650 SHOP PRIMINGGENERALLY
• Preparation: To BS EN ISO 12944-4. Remove fins, burrs, sharp edges and weld
spatter and clean out crevices.
- Surface finish: Blast cleaned to BS EN ISO 8501-1, grade Sa 2½.
- Prepared surfaces: Keep in a dry atmosphere and apply first coating without
delay.
• Priming:
- Primer: Solvent free epoxy.
Number of coats: One.
Dry film thickness (minimum): site specific.
- Application: To BS EN ISO 12944-7.
• Other requirements: Confirm that proposed primer is suitable for use on hand
cleaned steel and Overcoat ends of beams built into solid external walls with high
build bituminous paint. Extend coating min 150 mm from face of wall onto exposed
steelwork.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01