Knauf MF Suspended Ceilings

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1 Suspended Ceilings The Suspended Ceiling system is versatile and easy to install. Deep voids are easily created to hide services and the ceiling can be used to provide fire protection. Metal Components Metal Components Metal Perimeter Channel. Primary forms the upper suspension grid. Knauf Strap Hanger. Plasterboard Metal Components Our full range of Knauf Plasterboards is available to use with the Knauf MF Suspended Ceiling system. Ceiling Channel forms the lower suspension grid. Knauf Angle Section. 128 MF Suspended Ceilings

2 MF Suspended Ceiling The Suspended Ceiling system is very familiar to contractors who will easily be able to form openings, bulkheads and coffers. Key Features Simple and fast to install Can provide fire protection of up to 2 hours Shapes, features and openings are easily created Finishing Our complete range of finishing products includes hand-applied jointing, plaster and ready-mixed solutions. See our full guide on page 210. Metal Components Fixings Connecting Clip. Knauf Screws are selfdrilling and self-tapping and are designed to work perfectly with Knauf Plasterboards. Knauf Nut and Bolt. Metal Components Knauf Soffit Cleat. Our range of Ceiling Solutions includes: C-Form Suspended Ceiling 118 Direct to Joists 138 Warm Roof Linings 140 Acoustic Ceilings 194 MF Suspended Ceilings 129

3 Suspended Ceilings Fast track to your optimum solution Choose Find your 1 2 your sector performance levels 3 Find your solution Residential Education Commercial Healthcare Fire Loading Dimensions If your requirements fall outside these please contact Knauf Technical Services. Fire Protection to Floor or Roof Cavity above Soffit Lining MF1/08 Fire* Suspension 2 layers of 12.5mm Knauf Wallboard, fixed to the underside of a Ceiling system, with 100mm Knauf Earthwool Acoustic Roll in the void 30 mins mm mm mm 19.6 Soffit Lining MF2/13 Fire* Suspension 2 layers of 15mm Knauf Fire Panel, fixed to the underside of a Ceiling system, with 30mm Knauf Universal Slab RS45 in the void 60 mins mm mm mm 27.4 * Fire resistance period in accordance with BS 476: Part 22: Note: Consideration to the effect on fire performance must be given when installing services, as penetrations may affect the resistance period if not treated correctly. Fire Protection to Steel Beams supporting Concrete Floors Soffit Lining MF3/13 Fire* Suspension 1 layer of 12.5mm Knauf Fire Panel fixed to the underside of a Ceiling system 30 mins mm mm mm 12.0 Soffit Lining MF4/13 Fire* Suspension 2 layers of 12.5mm Knauf Fire Panel fixed to the underside of a Ceiling system 60 mins mm mm mm 22.0 * Fire resistance period in accordance with BS 476: Part 23: Note: Consideration to the effect on fire performance must be given when installing services, as penetrations may affect the resistance period if not treated correctly. 130 MF Suspended Ceilings

4 Optimised Solutions These are our Optimised Solutions; should your requirements fall outside these then please contact our Knauf Technical team who can provide detailed specification guidance for your project. Knauf Technical Services: Performance you can trust All Suspended Ceilings utilise high-quality, purposedesigned Knauf Plasterboards, Knauf Metal Components and Knauf Accessories, tested and warranted to work together as a whole system. Fire Protection to Timber Floor Construction Soffit Lining MF5/13 Fire* Suspension 1 layer of 12.5mm Knauf Fire Panel fixed to the underside of a Ceiling system 30 mins mm mm mm 12.0 Soffit Lining MF6/13 Fire* Suspension 2 layers of 12.5mm Knauf Fire Panel fixed to the underside of a Ceiling system 60 mins mm mm mm 22.0 Soffit Lining MF7/13 Fire* Suspension 3 layers of 15mm Knauf Fire Panel fixed to the underside of a Ceiling system, with 40mm Knauf Universal Slab RS45 in the void 120 mins mm 900mm mm 39.8 * Fire resistance period in accordance with BS 476: Part 21: Note: Consideration to the effect on fire performance must be given when installing services, as penetrations may affect the resistance period if not treated correctly. Ceiling System Loading Information The addition of services, ventilation and lighting can add significant loading to the ceiling system if the additional mass is to be borne by the ceiling. Please check the table below to see if the support channels need reducing to ensure the system is adequately specified to perform safely. MF ceiling Total load including weight of ceiling system this should include any additional lighting/ventilation system Suspension Hanger centres (mm) MF Primary centres (mm) MF Ceiling Channel centres (mm) MF Suspended Ceilings 131

5 Suspended Ceilings Installation Procedures Knauf Ceiling systems are designed to be simple and fast to install. Knauf Technical Services are on hand should you have any questions or unusual situations to deal with. General Ceiling Systems must be installed in accordance with Knauf s recommendations and the recommendations of BS 8212: 1995 and BS 8000: Part 8: When creating an airtight space, methods for the reduction of potential ceiling lift should be considered. For further advice contact Knauf Technical Services Perimeter Fixing 1 Perimeter should be secured to the walls at the required heights, at maximum 600mm centres and 50mm from the ends of channels. The top of the Perimeter should align with the underside of the Primary. The Perimeter forming the perimeter and the Knauf Primary do not need to be mechanically fixed together. Suspension 2 Select the fixing centres suited to the ceiling loading. See page 131. Fix Knauf Soffit Cleats to the structural soffit with suitable fixings. Choose either Knauf Angle Section or the flexible Knauf Strap Hanger and fix to the Knauf Soffit Cleat, using Nut and Bolt. When creating a shallow ceiling void, Knauf Universal Brackets can be used. MF Primary Support 3 The centres of the primary support channels depend on the loading requirement, determined in the MF loading information table on page 131. Joints in MF Ceilings If straight lengths of Primary Support need jointing, place the channels back to back, with a minimum 150mm overlap, and fix with two Knauf Wafer Head Jackpoint Screws. MF Ceiling 4,5 The Ceiling should be positioned at mm centres within the perimeter channels to coincide with the abutments of the boards, which will be fixed later. Connect the Ceiling Channel to the Knauf MF Primary Support by means of Knauf MF Connecting Clips. These clips fit over the Knauf MF Primary Support and snap-fix over the MF Ceiling. Insulation Once the primary support and the ceiling channels have been connected and before the boarding has started, Knauf insulation as specified should be inserted above the primary support channels. Care should be taken to ensure that the insulation is fitted neatly without gaps at abutments or between different rolls. Movement Control Joints Create movement control joints where ceiling runs exceed 10m, coinciding where possible with movement joints in the surrounding structure. Boarding 6,7,8 All boards should be offered up to the ceiling grid with the decorative face of the boards outwards and secured with Knauf Screws at maximum 230mm centres. Fixing centres should be reduced to 150mm at ends and perimeter. Knauf Angle Section or Knauf Strap Hanger should be fixed to the Knauf Primary Support with two Knauf Wafer Head Jackpoint Screws. The Primary Support should lie on the upper flange of the Perimeter Channel. Boards should be mounted at 90 to the direction of the ceiling channels. Once Knauf Plasterboards have been installed, spray apply Knauf Readymix plasters to finish ceiling ready for decoration. 132 MF Suspended Ceilings

6 1. 2. Fixing Perimeter Channel. Fixing the Knauf Angle Section to the joist to form hanger Fixing the Knauf Angle Section to Primary. Connect the Knauf Primary Support Channel to Ceiling Channel with Connecting Clips Adjusting the Ceiling Channel. Fixing Knauf Plasterboard to Knauf MF Ceiling Knauf Universal Brackets can be used as an alternative to Knauf Angle Section for shallow voids. Spray-applied Knauf Readymix Plasters make finishing ceilings safe, easy and fast. Knauf Training Courses We offer a range of comprehensive training courses at our purposebuilt training schools to ensure the installer is fully up to speed with the latest techniques and regulations. See page 276 for more information. MF Suspended Ceilings 133

7 Suspended Ceilings Application Details These details represent some of the most common design situations relevant to the system. Knauf Technical Services can advise on any specific detail you are trying to achieve. Abutment to wall, parallel to primary support channel Suitable fixing Structural soffit Detail 1 Knauf Soffit Cleat mm Knauf Strap Hanger or Knauf Angle Section Primary Knauf Wafer Head Jackpoint Screws Primary Ceiling Channel Note: Proposed fixing into substrate to be designed to take required loading. Knauf Plasterboard to suit specification Abutment to wall, perpendicular to primary support channel Suitable fixing Structural soffit Detail 2 Knauf Soffit Cleat mm Knauf Strap Hanger or Knauf Angle Section Connecting Clip Primary Ceiling Channel Perimeter Channel Knauf Plasterboard to suit specification Note: Proposed fixing into substrate to be designed to take required loading. Where you see these icons in a detail, that detail is particularly relevant to that sector. 134 MF Suspended Ceilings

8 Movement control joint Can be formed simply with standard components as shown, ideally coinciding with movement joints in the building structure. Detail 3 Suitable fixing Structural soffit Knauf Soffit Cleat Knauf Strap Hanger or Knauf Angle Section Primary Ceiling Channel Knauf Plasterboard to suit specification Knauf Movement Control Joint Note: Proposed fixing into substrate to be designed to take required loading. Junction with partition Detail 4 Suitable fixing Knauf Sealant or Knauf Intumescent and Acoustic Mastic, if required Knauf Plasterboard to suit specification Knauf Flat Fixing Plate Knauf Sealant Knauf Plasterboard to suit specification Note: Proposed fixing into substrate to be designed to take required loading. MF Suspended Ceilings 135

9 Suspended Ceilings Change of level and bulkhead Detail 5 Knauf Strap Hanger or Knauf Angle Section Knauf Wafer Head Jackpoint Screws Perimeter Channel Connecting Clip Ceiling Channel Knauf Plasterboard to suit specification 25 x 50mm Knauf Angle Section Change of level and bulkhead Detail 6 Knauf Strap Hanger or Knauf Angle Section Connecting Clip Knauf Wafer Head Jackpoint Screws at 600mm centres Perimeter Channel Primary Ceiling Channel Knauf Plasterboard to suit specification Ceiling Channel Where you see these icons in a detail, that detail is particularly relevant to that sector. 136 MF Suspended Ceilings

10 Change of level and bulkhead Max. 100mm Detail 7 Knauf Strap Hanger or Knauf Angle Section Connecting Clip Primary Support Channel Ceiling Channel 25 x 50mm Knauf Angle Section Perimeter Channel Knauf Plasterboard to suit specification Change of level and bulkhead Detail 8 Knauf Strap Hanger or Knauf Angle Section Connecting Clip Primary Ceiling Channel Perimeter Channel Knauf Plasterboard to suit specification MF Suspended Ceilings 137