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HD1017: Hush-System HF25 Advanced
Suitable for:
- domestic
- residential
- education
- leisure
The Hush System HF25 Advanced is a high-performance separating floor and ceiling build-up that provides outstanding airborne and impact sound insulation in timber structures. Building on the standard HF25 design, this advanced system incorporates an additional mass layer by bonding a 19mm plasterboard plank between two layers of flooring grade chipboard. This added density, combined with resilient joist isolation and absorptive infill, delivers superior acoustic performance while maintaining compliance with Part E of the Building Regulations. Below the joists, the system uses the Hush-Bar Plus resilient ceiling solution with Hush-Slab 100 absorbers and a multi-layer plasterboard lining. Together, these elements create an enhanced acoustic system suitable for demanding residential, student living, and refurbishment projects.
System Components
- Hush-Felt 25 Resilient Strip to joist tops.
- First layer: 18mm T&G flooring grade chipboard (all joints glued with Hush-Bond).
- Intermediate mass: 19mm plasterboard plank bonded with Hush Acoustic Sealant.
- Second layer: 18mm T&G chipboard bonded to plank with Hush Acoustic Sealant.
- Hush Seal 20 perimeter seal to all floor edges.
- Hush-Slab 100 Sound Absorber fitted between joists.
- Hush-Bar Plus System screw fixed to underside of joists at 450mm centres.
Installation Guidance
- Staple Hush-Felt 25 Resilient Strips to the joist tops.
- Lay 18mm T&G flooring grade chipboard over joists and glue all joints with Hush-Bond.
- Bond a 19mm plasterboard plank to the top of the chipboard using Hush Acoustic Sealant.
- Bond a further 18mm T&G chipboard layer to the plank with Hush Acoustic Sealant.
- Seal all perimeters with Hush Seal 20 perimeter seal.
- Fit Hush-Slab 100 between joists.
- Screw fix the Hush-Bar Plus System to the underside of joists at 450mm centres.
- Residential apartments and houses needing higher acoustic performance.
- Student accommodation and hotels with stringent noise control requirements.
- Refurbishments where an enhanced upgrade is needed within a timber floor build-up.
- Mixed-use and commercial projects using lightweight timber structures.
- Part E compliant – tested for airborne and impact sound insulation.
- Advanced mass layer: 19mm plasterboard plank sandwiched between two 18mm chipboard layers.
- Resilient isolation using Hush-Felt 25 reduces impact transmission through joists.
- Hush-Bar Plus decouples the ceiling lining from joists for improved airborne performance.
- Complete, tested system for timber joist constructions in new build and refurbishment projects.
Test Data
Test data for field tests in compliance with Building Regulations Approved Document E can be supplied upon request.
For advice on the use of HD1017: Hush-System HF25 Advanced, as part of a system within any project, please contact our experienced technical team on 0151 933 2026 who will be happy to give comprehensive and practical advice to meet with your requirements.
Acoustic Performance - Typical Results*
Impact  dB |
Airborne  dB |
 dB |
| 50 | 58 | 52 |
Test Data
Test data for field tests in compliance with Building Regulations Approved Document E can be supplied upon request.
Full fitting instructions are supplied with all products and are available to download from the Installation Guides section.
Should you have any technical questions prior to or during installation, please call 0151 933 2026 for friendly and straightforward advice.
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