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BCSA Bolting Competence-Secure[1]
Jazan Baseline Schedule
Chapter 4: Ceilings, Floors and Roofs
Chapter 4: Ceilings, Floors and Roofs - Introduction
Fire Testing Methods Floors should normally be tested or assessed in accordance with BS 476: Part 21: 1987 and are required to satisfy the three failure criteria of loadbearing capacity, integrity and insulation when exposed to fire from below. Loadbearing concrete floors supported by steel beams and protected with a suspended ceiling should be tested or assessed to BS 476: Part 23: 1987. Design Considerations The following points should be considered when determining the correct specification to ensure a timber floor will provide the required fire performance: 1. Timber Joist Width The wider the joist the more bearing the fire protection panel has to be secured to and therefore will perform better in fire conditions. 2. Timber Joist Depth The deeper the joist the deeper the air cavity and the longer the heat will take to pass through the structure. 3. Timber Joist Spacing The further apart the joists, the greater distance the ceiling lining will have to span and therefore the more onerous the conditions in fire. 4. Timber Flooring
Note: In the following pages guidance will be given on most of the these topics. Further advice can be obtained from the Promat Technical Services Department.
The timber type, thickness and jointing are all critical. 5. Suspended Ceilings The distance between the underside of the timber joists and the suspended ceiling protecting the floor is critical. Normally, the greater the air cavity between the ceiling and floor, the better the fire performance. 6. Light Fittings Light fittings located within a ceiling cavity normally require to be enclosed in an adequately supported fire protection box to prevent fire spreading quickly into the ceiling cavity. Most light fittings will require ventilation in normal use, and this should be considered in the light box design. 7. Service Penetrations Care needs to be taken in detailing a suitable fire stopping system around any penetration of the floor by services to ensure: a) the fire stopping material remains in situ b) fire and smoke do not penetrate the floor cavity which ultimately will lead to premature collapse of the joists and/or penetration of fire and smoke through the timber flooring. 8. Cavity Barriers Building Regulations specify where cavity barriers are required. 9. Engineered Timber Joists Engineered or laminated joists should be treated differently to solid timber joists. Please contact the Promat Technical Services Department for further information.
Chapter 4: Ceilings, Floors and Roofs - Timber Floors and Roofs
NEW CEILING LINING
Timber floors should normally be tested or assessed in accordance with BS 476: Part 21: 1987 and are required to satisfy the three failure criteria of loadbearing capacity, integrity and insulation when exposed to fire from below.
Bodycote: WF Assessment No 169603
30 minutes fire rating, loadbearing capacity, integrity and insulation in accordance with the criteria of BS 476: Part 21: 1987.
2 1. Promat MASTERBOARD boards, 6mm thick. 2. Timber noggings may be required behind transverse joints for decorative purposes only. 3. 50mm nails. 4. Clout nails or similar, 50mm long at nominal 200mm centres. 5. M6 steel anchor bolt at nominal 600mm centres. 6. Flooring, minimum 19mm thick T & G boarding. 7. Timber joists, minimum 225mm x 38mm at maximum 610mm centres. 8. Timber batten, 50mm x 50mm. 1 4 7
Detail 1 Plan
Fig 4.10.3 Fig 4.10.4
Detail 3 Wall connection (Section B-B)
Detail 2 Fixing to the underside of joists (Section A-A)
The construction, maximum span and maximum loading on all timber floors should be in accordance with BS 5268: Part 2.
Certifire Approval No CF 420 Chapter 4: Ceilings, Floors and Roofs - Timber Floors and Roofs
60 minutes fire rating, loadbearing capacity, integrity
and insulation in accordance with the criteria of BS 476: Part 21: 1987.
1. Promat SUPALUX boards, 9mm thick. 2. Promat SUPALUX fillet/coverstrip, 80mm x 9mm. 3. Rock wool, minimum 30mm x 60 kg/m3 or 60mm x
23 kg/m3. 3 6 4. 75mm nails (with heads) at 200mm centres or M4 x 63mm long steel woodscrews at 300mm centres. 5. Timber joists, minimum 130mm x 38mm at maximum 610mm centres.
Fig 4.10.5
Fig 4.10.6
6. Cover strips at lateral board joints should be fastened using M4 x 25mm long self-tapping screws at nominal 300mm centres on both sides of joint. 7. T & G or square-edged flooring, minimum 19mm thick. Secure 4.8mm hardboard over square-edged floorboards.
1. Promat SUPALUX boards, 12mm thick. 2. Rock wool, minimum 30mm x 60 kg/m3. 3. 75mm nails (with heads) at 200mm centres or M4 x 63mm long steel woodscrews at 300mm centres. 4. Timber joists, minimum 150mm x 50mm at maximum 610mm centres. 2 5. T & G or square-edged flooring, minimum 19mm thick. Secure 4.8mm hardboard over square-edged floorboards.
Chapter 4: Ceilings, Floors and Roofs - Timber Floors and Roofs Certifire Approval No CF 420
1. Promat SUPALUX boards, 9mm thick. 2. T & G or square-edged flooring, minimum 19mm thick. Secure 4.8mm hardboard over square-edged 5