Inspired by nature's ability to be strong and gentle all at once, Sisalwool Silent is a high performance, natural acoustic insulation made from breathable plant and wool fibres.
Key benefits:
- Contents: 40% sisal, 40% sheep's wool, 20% bi-co binder
- Vapour Permeable: allowing traditional stone buildings to breathe and moisture to transfer
- Flexible Fitting: can be friction-fitted between rafters, ceiling joists, floor joists and studwork
- Safe to Touch: can be handled safely, comfortably and does not cause skin irritation
- Acoustic Excellence: offers proven Class B sound absorption
- Low Carbon: using natural and circular economy materials such as recycled sisal and waste wool
- Universally Compatible: suitable for both new build and retrofit, including historic buildings
- Fully Recyclable: can be returned at end of life for reprocessing
Product Specifications
| Density | 48kg/m³ |
| Thickness | 50mm |
| Length | 1200mm |
| Width | 370mm or 570mm |
Technical Specifications
| Property | Standard | Unit | Value |
|---|---|---|---|
| Thermal conductivity | BS EN 12667 | W/mk | 0.036 |
| Water absorption | EN 1609 | Wp kg/m² | 4.26 |
| Water vapour diffusion | BS EN 12086:2013 | µ (MU) | 1.13 |
| Reaction to fire | EN 13501-1 | Euroclass | E |
| Sound absorption (more below) | EN ISO 354 and EN ISO 11654 | αw | .85 (Class B) |
| Moth resistance | ISO 3998 (EAD 040005-00-12-1) | N/A | Pass |
Note: All above values are indicative and natural variation between batches will occur.
Sound Absorption
| Sisalwool Silent Thickness | Sound Absorption Coefficient | Rating |
|---|---|---|
| 100mm | 1.00 αw | Class A |
| 50mm | 0.85 (H) αw | Class B |
In accordance with BS EN ISO 354:2003 and BS EN ISO 11654:1997.
Sound Reduction
Solid Timber Floor Build Up
| Joist Size | Stud Spacing | Plasterboard | Chipboard | Sisalwool Silent Thickness | Sound Reduction (Rw) |
|---|---|---|---|---|---|
| 200 x 50mm | 450mm | 1 x 12.5mm standard wallboard | 1 x 22mm T&G | 100mm | 42dB |
Internal Partition Wall Build Up
| Timber Stud Size | Stud Spacing | Plasterboard | Sisalwool Silent Thickness | Sound Reduction (Rw) |
|---|---|---|---|---|
| 63mm | 600mm | 2 x 12.5mm standard wallboard | 50mm | 40dB |
In accordance with BS EN ISO 10140-2:2021 for requirements of Building Regulations Part E.
Data sheet download
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