Due to the design flexibility of British Gypsum systems, they can be tailored to meet the requirements of a wide range of applications.
Planning - key factors
The position of services and heavy fixtures should be pre-determined and their installation planned into the frame erection stage.
Partition to structural steelwork junctions
When designing the layout of rooms requiring separation by sound insulating walls abutting structural steelwork, consideration should be given to the potential loss of sound insulation performance through the steelwork. Refer to WHITE BOOK section 3.2.2 – Principles of building acoustics.
Cavity fire barriers
Minimum 12.5mm Gyproc plasterboard, screw-fixed into the web of perimeter channels or vertical studs, will provide a satisfactory closure to flame or smoke. Refer to WHITE BOOK section 10 – Cavity fire barriers.
Penetrations of fire-resistant or sound-insulating constructions for services need careful consideration to ensure that the performance of the element is not downgraded and also that the services themselves do not act as the mechanism of fire spread or sound transmission. Refer to WHITE BOOK section 3.5 – Service installations.
When designing for the installation of services such as fire dampers and associated ductwork through a GypWall partition, consideration should be given to the size and weight of the damper - this will determine whether it can be supported directly from the partition or needs to be independently supported from the structure. Refer to WHITE BOOK section 3.5 – Service installations.
The installation of electrical services should be carried out in accordance with BS 7671. The cut-outs in the studs can be used for routing electrical and other small services (see Construction details – 1). Switch boxes and socket outlets can be supported from Gypframe 99 FC 50 Fixing Channel fixed horizontally between studs, or a high performance socket box detail used where higher acoustic performance is required.
Where Gypframe AcouStuds are used, services are routed through 50mm x 28mm ‘H’ shaped push-outs, at the same centres as shown in Construction details – 1a for conventional cut-outs. Cables should be protected by conduit, or other suitable precautions taken to prevent abrasion when they pass through the metal frame.
Fixing floor and ceiling channels
Gypframe Floor & Ceiling Channels must be securely fixed with a row of fixings at 600mm maximum centres. For 94mm channels and above, two rows of staggered fixings are required, each row at 600mm centres and each fixing 25mm in from the flange. If the floor is uneven, a 38mm thick timber sole plate equal to the width of the channel should be used.
If the concrete or screeded floor is new, consideration should be given to the installation of a damp-proof membrane between the floor surface and the channel or sole plate.
The designer should consider thickness tolerances of the partition types in relation to the proposed door frame detail. Standard door frame detailing to suit BS 5234 Light and Medium Duty applications is shown in WHITE BOOK Construction details – 25. Detailing to satisfy BS 5234 requirements for Heavy and Severe Duty is shown in WHITE BOOK Construction details – 26 - 27. The door manufacturer should also be consulted in relation to door details.
Framing surround for openings
Where services such as horizontal ducts, fire dampers and access panels are required to penetrate the wall, their position should be pre-determined in order that a framed opening can be provided. The openings should be constructed using established metal stud procedures. See WHITE BOOK Construction details – 31 - 32.
Control joints may be required in the partition to relieve stresses induced by expansion and contraction of the structure (see WHITE BOOK Construction details – 14). They should coincide with movement joints within the surrounding structure.
Partition head deflection designs may be necessary to accommodate deflections in the supporting floor. Deflection heads may also be required to the underside of roof structures subjected to positive and negative pressures. Refer to WHITE BOOK Construction details – 15 - 22.
For special detailing that minimises the loss of acoustic performance: Refer to WHITE BOOK section 3.2.2 – Principles of building acoustics.
Access for maintenance
Gyproc Profilex Access Panels are available to provide access for maintenance. Access panels must be fully compatible with drywall construction and match the fire rating of the partition.
Lightweight fixtures can be made directly to the partition linings. Medium weight fixtures can be made to Gypframe 99 FC 50 Fixing Channel. Refer to WHITE BOOK section 3.5.2 – Service penetrations and fixing into drywall systems.
For further details on tiling guidance: Refer to WHITE BOOK section 13 – Finishing systems and decorative effects, Tiling.
Refer to WHITE BOOK section 13 – Finishing systems and decorative effects.
For more information refer to the British Gypsum SITE BOOK.