048 – r2 - Promatect 250 Column Encasement - Interface with Partition

® PROMATECT -250 Column Encasement to Partition Interface Introduction: ®PROMATECT -250 is a non-combustible mineral bound light weight board, designed to provide a high degree of strength, dimensional stability and up to 150 minutes fire protection to structural steelwork, in terms of the loadbearing capacity criteria of BS 476: Part 21: 1987. The degree of fire protection depends on the A/V section factor and the limiting temperature of ®the steel, this in turn dictates the thickness of PROMATECT -250 required The partition may be fire rated or non-fire rated. If the partition connected to the column is non-fire rated then it is probable that the facing boards will either burn or fall away before the end of the specified fire resistance period for the column. It must be ensured as far as practical that the collapse of the facing boards does not damage the column casing. The following recommendations should be adopted where a partition system is connected to ®one or both flanges of PROMATECT -250 protected steel columns. The maximum height of the columns and partitions is 5m. If it is also required to provide fire insulation across the beam or column in order to maintain compartmentation to the criteria of BS 476: Part 22: 1987 (maintaining insulation to average temperature rise of 140°C, maximum temperature rise 180°C), then the minimum thickness of the ®PROMATECT -250 board on each side of the beam or column must be as ...