TDS-091 - Promalit partition interface

Soof - Ehubbard

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® Promat TD Board Detail for Beam Encasement to Fire Rated Partition Head Interface Introduction: ®Promat TD Board is a lightweight non-combustible board specially designed to provide up to 240 minutes fire protection to structural steelwork. The following recommendations should be adopted where a fire rated partition system, running in the ®same plane as a Promat TD Board protected steel beam, is connected to the underside of the beam. Construction Details: • The steel Z brackets, 0.9mm to 1.2mm thick with flanges 32mm wide, (1) are fastened to the beam (2) using shot fired 3.7mm x 16mm steel nails (Hilti ENK 16 S12 or equivalent) at 300mm maximum centres. The Z brackets are the same length as the width of the beam and are spaced at 600mm nominal centres along the length of the flange. • The partition must also include a deflection head assembly where it is fastened to a supporting beam, to allow for the movement of the steel beam in a fire situation. The Building Regulations require that provision for a deflection should be 40mm, or the span of the beam (in mm) divided by 100 (L/100), whichever is the larger. ®• If a SUPALUX partition is installed, a 40mm movement head may be provided using a deep head channel (3) and ensuring that the partition facing boards overlap the head track, but have sufficient clearance to the underside of the beam to accommodate the required deflection. A light gauge angle ®is fastened to the Z ...

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Publié par	Soof
Nombre de lectures	43
Langue	English

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Promat TD BoardDetail for Beam Encasement to Fire Rated Partition Head Interface Introduction: ® Promat TD Boardis a lightweight noncombustible board specially designed to provide up to 240 minutes fire protection to structural steelwork. The following recommendations should be adopted where a fire rated partition system, running in the ® same plane as a Promat TD Boardprotected steel beam, is connected to the underside of the beam.

Construction Details: • Thesteel Z brackets, 0.9mm to 1.2mm thick with flanges 32mm wide,(1)are fastened to the beam (2)using shot fired 3.7mm x 16mm steel nails (Hilti ENK 16 S12 or equivalent) at 300mm maximum centres. The Z brackets are the same length as the width of the beam and are spaced at 600mm nominal centres along the length of the flange. •partition must also include a deflection head assembly where it is fastened to a supporting The beam, to allow for the movement of the steel beam in a fire situation. The Building Regulations require that provision for a deflection should be 40mm, or the span of the beam (in mm) divided by 100 (L/100), whichever is the larger. ® •a SUPALUX Ifpartition is installed, a 40mm movement head may be provided using a deep head channel(3)and ensuring that the partition facing boards overlap the head track, but have sufficient clearance to the underside of the beam to accommodate the required deflection. A light gauge angle ® is fastened to the Z brackets(4)to carry a double layer of the SUPALUXboard(5)to cover the expansion gap. The board thickness and further details are given in the Promat Certifire document CF 420A. The depth is adjusted to suit the amount of deflection required. For other partitions, consult with the manufacturer concerned. Steel Protection Performance:Up to 240 minutes protection, in terms of the load bearing capacity, criteria to BS 476:Part 21: 1987. AUTHORITY: PromatRecommendation – Based on Inhouse Knowledge and Technical Experience Promat UK Limited Technical Services DepartmentTechnical Data The Sterling Centre, Eastern Road Sheet – 091Bracknell, Berkshire RG12 2TD Tel: 01344381 400 Page 1 of 2 Fax: 01344381 401(Sept 2008)Email: technicaluk@promat.co.uk

Promat TD BoardDetail for Beam Encasement to Fire Rated Partition Head Interface Important Notes: Fixing details (as shown) are suitable for providing fire protection to steel beams of maximum depth of 500mm. Alternative fixing methods may be required for deeper beams. Contact Promat UK Technical Services department for further information. Steel beams must be supported from appropriate masonry/ concrete or steel constructions that have a fire resistance of at least that required for the protected beam in terms of BS476: Part 21: 1987, and are capable of providing adequate support to the constructions for the required period of fire resistance. It is assumed that the partition system that is connected to the steel beam is a steel framed drywall system that has a fire resistance of at least that required for the protected beam or column in terms of BS476: Part 22: 1987.Where a partition meets the underside of a beam, a deflection head assembly must be fitted to allow for the bowing of the steel beam in a fire situation. The minimum allowance for deflection should be 40mm or the span of the beam (in mm) divided by 100 (L/100), whichever is the larger. This is required so that the deflection of the beam does not result in damage to the partition and ® the partition does not damage the Promat TD Boardencasement. ® The thickness of Promat TD Boardrequired to provide the period of fire protection, depends on the A/V section factor, method of fix and the limiting temperature of the steel. Where a limiting temperature hasnot beenprovided, then Promat will have specified the protection ° thickness to the default value of 550 C. However, the user should be aware that this default temperature may not necessarily be adequate, or appropriate, for the proposed use for which the building is intended, and this default temperature specification must be verified with the structural fire designer concerned. The load on the structure at the time of the fire can also be calculated by treating it as an accidental limit state. If used, this will allow structural fire designers to specify a limiting or failure temperature for a given structural section, to be provided to the fire protection contractor.Where the limiting temperature is provided, Promat will specify the structural steel protection thickness, appropriate to that temperature. If the span of the beam is large, or the amount of movement that the deflection head assembly can ® accommodate is limited, then the thickness of Promat TD Boardfor the beam encasement should be chosen using a maximum limiting steel temperature of 400°C. This will minimise the potential bowing of the beam. If it is also required to provide fire insulation across the beam 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 theminimumthickness of the ® Promat TD Boardboard on each side of the beam or column must be as follows: Fire resistance – minutesBoard thickness  mm 60 25 90 30 120 35 150 40 180 45 240 50 Thicker board may be required to provide the required period of fire protection to the steelwork in terms of the loadbearing capacity to BS476: Part 21:1987 AUTHORITY: PromatRecommendation – Based on Inhouse Knowledge and Technical Experience Promat UK Limited Technical Services DepartmentTechnical Data The Sterling Centre, Eastern Road Sheet – 091Bracknell, Berkshire RG12 2TD Tel: 01344381 400 Page 2 of 2 Fax: 01344381 401(Sept 2008)Email: technicaluk@promat.co.uk

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