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Separating timber floors with joists to meet Part E

Separating timber floors with joists to meet Part E

Separating timber floors with joists to meet Part E

Ensure you are separating timber floors with joists meet Part E Building Regulations using Noisestop Systems range of floor soundproofing solutions. This guide will show you which materials to pass Building Regulation Part E using acoustic underlay mats, sound insulation slabs, soundbreaker bars and acoustic plasterboard. Alternative methods can be used, including using floating floors instead of acoustic underlays to comply with Building Regulations. For more information, take a look through our guide to soundproofing floors using a floating floor to meet Part E for separating floors.

For the separating floors to meet Part E, you will have to meet the following levels of impact and airborne sound.

  • Airborne sound 43dB your floor must achieve a higher figure when tested
  • Impact sound 62dB (new build) or 64dB (conversion) your floors must achieve a lower figure

The higher the airborne sound figure of the solution, the better the performance. The lower the impact sound figure, the better the performance.

Soundproofing a timber floor with joists to meet Part E

Ensure your timber floors with joists comply with Building Regulations by increasing the mass and density. The best way to achieve this is to use an acoustic floor either over the existing sub-floor or a floating floor directly onto the floor joists. Using this type of flooring solution will reduce impact sound transfer through floors and structural walls, which will reduce flanking sound transmission.

Acoustic mats over an existing sub-floor

Noisestop Systems provide a range of acoustic underlays used to soundproof timber floors with joists to meet Part E. Depending on your final floor finish, use either the Noisestop F7 or Noisestop F7+ as part of your flooring solution.



Noisestop F7

soundproofing underlay noisestop f7

Noisestop F7

Noisestop F7+

Noisestop F7+ floor soundproofing

Noisestop F7+

Use acoustic insulation between the floor joists

Acoustic insulation between the floor joists will block and absorb airborne sound transfer. Use a minimum density of 60kg/m³ to ensure enough density to stop the required sound level. The thickness of the sound insulation slabs must be 100mm.

Acoustic insulation 100mm

Insulation Slabs

Use soundbreaker bars to the underside of the ceiling joists

Use soundbreaker bars on the underside of your ceiling joists to create separation between the plasterboard and the ceiling joists. Using the soundbreaker bars, sound transmission through the joists will be reduced due to the design of the bars. The plasterboard will be isolated from the ceiling joist, and sound vibration through that area will be absorbed and reduced by the soundbreaker bar.

Soundbreaker bars on the underside of the ceiling joists

soundbreaker bars on a ceiling

Acoustic plasterboard to finish your ceiling

Use two layers of acoustic plasterboard to finish your ceilings. Using two layers will have the correct ceiling mass, and you will achieve a one-hour fire rating by combining two layers of 12.5mm acoustic plasterboard. The acoustic plasterboard must be fixed directly to the soundbreaker bars and not onto the ceiling joists for this type of part E solution.


12.5mm acoustic plasterboard

Acoustic plasterboard for soundproofing ceilings and walls
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