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Sound insulating floor system

GypFloor SILENT is specified in residential conversion or improvement work to upgrade an existing timber joist floor to meet the acoustic requirements of Building Regulations Approved Document E. It is also used in new-build to improve the sound insulation performance of internal floors.

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  • Improves airborne and impact sound insulation of existing timber joist floors
  • Widely used in conversion work and refurbishment
  • Resilient interface between channel and floor joist
  • Minimal increase in floor depth


Acoustic upgrade of existing timber floors.

Planning - key factors

The GypFloor SILENT system adds 7mm to the level of the top of the joists. The finished surface of the applied ceiling linings will be 16mm plus the thickness of the lining boards from the underside of the joists when Gypframe RB1 Resilient Bar is used. Ceiling linings should be fixed prior to any installation of drylining or plastering on walls. If this is not possible, ceiling linings should neatly abut the wall.

In refurbishment work the level of existing joists should be checked. Their upper surfaces should be reasonably level and straight for the flooring application. If there is misalignment of their lower surfaces, consideration should be given to using a GypLyner UNIVERSAL or CasoLine MF suspended ceiling to support the ceiling boards.


The system is primarily intended for timber floors with an intensity of distributed load of up to 5.0kN/m2, and a point load of 4.5kN. An increase in the mass of the floor will result from upgrading. The load capacity of the supporting floor joists should therefore be checked, with due consideration to the effects of lateral buckling and the need for intermediate restraints. This may be particularly important where the system is to be used in conjunction with engineered timber ‘I’ joists.

Flanking transmission

Care should be taken to ensure that the associated structure is suitable to achieve the level of sound insulation required. Particular reference to Building Regulations Approved Document E should be made as regards the use of this floor type and the requirements of the surrounding structure. Where the walls supporting the floor weigh less than 365kg/m2 the use of an acoustic shield lining to the walls should be considered. Flanking detail specifications are given in the current British Gypsum HomeSpec publication, available to download from this website.


The installation of services within the floor zone should be carried out to allow easy access from above and should, where possible, follow the line of the floor joists. Refer to WHITE BOOK section 3.5 – Service installations.

Board finishing

Refer to WHITE BOOK section 13 – Finishing systems and decorative effects.

  • Sound insulation airbourne: 54 - 63 (Rw dB)
  • Sound insulation impact: 63 - 55 (Lnw dB)
  • Fire resistance: 30 - 90 (mins)

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