SilentCloud Felt 25 Acoustic Joist Strip


Sale price£189.69

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The SilentCloud 25 Joist strips present a cost-effective alternative to composite floating flooring, delivering exceptional performance. Tailored for the construction of floating floors over timber joists in new build and refurbishment projects, these strips feature hardboard slats, offering a robust and smooth surface to support chipboard, OSB, or plywood T&G flooring boards. SilentCloud 25 serves as an integral component of a sound insulation system between separating floors.

Crafted to provide impact sound insulation between separating floors, these strips find common application in refurbishment and new build projects as part of floating floors over timber joists. They seamlessly integrate with various SilentCloud Systems, surpassing current Building Regulation requirements of Part E (England and Wales), Part H (Scotland), and Part G (Northern Ireland). Each strip comprises a double layer of 10mm SilentCloud™ resilient layer factory stapled to hardboard slats.


  • Application: Directly over timber joists
  • Comprises: 140mm x 50mm hardboard slats Double layer of 10mm SilentCloud resilient layer
  • Overall Strip Dimensions: 25mm deep x 50mm wide
  • Weight per 1m: 0.6 kg
  • Overall nominal thickness: 25mm
  • Overall thickness in use: 20-21 mm
  • Compatible SilentCloud Systems: SilentCloud System 1, SilentCloud System HF25, SilentCloud System HF25 Advanced
  • Accessories: SilentCloud-Seal 20 Perimeter Seal, SilentCloud-Bond Panel Adhesive

Performance SilentCloud 25 Joist strips excel in acoustic performance, offering impact sound insulation of 50 dB, airborne sound insulation of 58 dB, and a CTR of 52 dB. These results are based on SilentCloud System HF25 Advanced test results incorporating SilentCloud-Panel 25 Resilient Joist Strips.

Features And Benefits

  • Affordable alternative: Cost-effective solution for achieving impact sound insulation between separating floors
  • Wide range of applications: Suitable for use in refurbishment and new build projects as part of floating floors over timber joists
  • Compatible with SilentCloud Systems: Works seamlessly with various SilentCloud Systems that exceed current Building Regulation requirements
  • Double layer construction: Consists of a double layer of 10mm SilentCloud resilient layer factory stapled to hardboard slats for enhanced performance
  • Easy installation: Quick and easy to install, saving time and effort during construction
  • Excellent acoustic performance: Provides exceptional sound insulation by reducing impact noise transmission
  • Durable and long-lasting: Ensures a reliable and long-lasting sound insulation solution
  • Enhanced comfort: Helps create a quieter and more comfortable living or working environment
  • Versatile usage: Can be used in various applications, including residential, commercial, and educational buildings
  • Environmentally friendly: Made from recycled materials, contributing to a sustainable construction approach
  • Improved indoor air quality: Does not release harmful chemicals, ensuring a healthier indoor environment
  • Fire-resistant: Provides an additional layer of fire protection, enhancing overall safety


  • Residential Buildings: SilentCloud 25 Acoustic Joist Strip is used in residential buildings to reduce impact and airborne sound transmission. It is ideal for use in floors, walls, and ceilings to improve the acoustic performance of the building.
  • Commercial Buildings: In commercial buildings, this product is used to create a quiet and peaceful environment. It is commonly used in offices, restaurants, hotels, and other commercial spaces to reduce noise levels.
  • Industrial Buildings: In industrial settings, SilentCloud 25 is used to reduce noise from machinery and other loud sources. This helps to create a safer and more comfortable working environment.
  • Education Institutions: Schools, colleges, and universities use this product to create quiet study and learning environments. It helps to reduce noise transmission between rooms and floors.
  • Healthcare Facilities: In hospitals and other healthcare facilities, SilentCloud 25 is used to create a quiet and restful environment for patients. It also helps to maintain privacy by reducing noise transmission between rooms.
  • Recording Studios: SilentCloud 25 is used in recording studios to improve sound quality by reducing background noise and echo. It helps to create a clean and clear sound environment for recording.
  • Home Theatres: This product is used in home theatres to enhance sound quality by reducing echo and background noise. It helps to create a more immersive and enjoyable viewing and listening experience.

Installation Lay the strips end to end with the hardboard pads facing upwards. Staple through the SilentCloud into the tops of the joists using 16mm staples. Leave space for a perimeter noggin at the end of the joist runs, onto which a length of SilentCloud 25 should be installed. When planning the floor layout, leave a 10-15mm expansion gap around all perimeters. Apply a snake of SilentCloud-Bond Panel Adhesive onto each of the hardboard pads and lay the flooring boards on top in a broken bond pattern. At the same time, glue the flooring boards together at all tongue and groove joints. Press SilentCloud-Seal 20 Perimeter Seal into the perimeter expansion gap to ensure that the floor floats freely from the walls, maintaining acoustic isolation. Do not use any other fixings when installing the floating floor, as they can negatively impact performance. Skirting should be installed with a minimum clearance of two or three millimeters from the floor surface (PCT only).

Certifications Building Regulations Document E compliant

About SilentCloud Acoustics SilentCloud Acoustics is a leading manufacturer of acoustic products, specializing in sound insulation solutions for the construction industry. With a focus on innovation and quality, SilentCloud Acoustics offers a wide range of products designed to meet the highest standards of acoustic performance.

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