Page 135 - McD_6118-AEW-XX-XX-NBS-A-001_Neat

F22 Cast stone ashlar walling/dressings

GENERAL REQUIREMENTS/MANUFACTURE

220 CONTROL SAMPLES
• Required samples: After finalization of design, one each of the following
components: site specific.
• Approval of appearance: Obtain before manufacture of remaining units.
• Identification and storage location: Clearly label and retain at factory for
comparison with production units.

255 COMPRESSIVE STRENGTH
• Cube strength: Sampling to BS 1217. Testing to BS EN 12390-1, 2 and 3 as
appropriate, with compaction and curing representative of the methods used in
production of the cast stone components.

300 REINFORCEMENT
• Non structural reinforcement: Include to resist shrinkage and handling stresses.
• Carbon steel reinforcement: To BS 4449 and BS 4483 as appropriate.
- Cutting and bending: To BS 8666.
• Galvanized reinforcement: Galvanizing to BS EN ISO 1461 after cutting.
• Stainless steel reinforcement: To BS 6744, designation 1.4301.
- Cutting and bending: To BS 8666.
• Condition at time of placement: Clean, free of corrosive pitting, loose materials
and substances which adversely affect the reinforcement, mix, or bond between
the two.
• Fixing: Accurate and secure. Prevent intrusion of wire or clips into the cover.

312 COVER TO REINFORCEMENT

• General: Minimum cover to reinforcement:

- Carbon steel:

External faces (exposed to weather) 40 mm

Internal faces (protected

from weather) 30 mm

- Galvanized steel:

External faces (exposed to weather) 30 mm

Internal faces (protected

from weather) 20 mm

- Austenitic stainless steel:

All faces (select the greater of the two) 10 mm or

2x bar diameter

- Other materials/ coatings: Submit proposals including minimum cover.

335 MANUFACTURING ACCURACY
• Standard: To BS 1217, clause 9.
• Additional tolerances: site specific.

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