£11.56 (inc. VAT £13.87)
SilentJoist felt strips is the natural and effective way to reduce structure borne sound transmission caused by contact between joists and floors/subfloors. SilentJoist is rolled out on existing timber or joists prior to wooden floors or subfloors being laid down. Each roll is 100mm wide, 10m long.
Typical lead time 3–15 working days.
ISOLENA Sheep wool felt strips without paper, biocide-free wool protection Ionic Protect® made from 100% pure sheep’s wool without synthetic additives or supporting fibres. The insulating material is renewable, durable, reusable, fully recyclable and certified with the NaturePlus eco-label.
Applications
Thermal insulation
Internal walls; window joints and prefabricated construction elements; window insulation; roof windows; door insulation; expansion joints; cavity insulation.
Sound Insulation
Acoustic decoupling; acoustic floor decoupling; floor insulation; acoustic underlay insulation; subfloor insulation.
| Feature | Value |
|---|---|
| Vapour diffusion resistance coefficient μ EN ISO 12572 | 1 |
| Specific heat capacity c | 1760 J/kgK |
| Length-related flow resistance according to EN 29053-1 | r = 29.5 kPa s/m² |
| Fire behaviour according to EN 13501-1 | C-s2, d0 |
| Mould growth intensity according to EAD 040005-00-1201 Annex B | 0 |
What are SilentJoist wool felt strips used for?
SilentJoist wool felt strips are designed to reduce structure-borne sound transmission between timber joists and floors or subfloors.
They are installed directly on top of joists before flooring is laid, helping to absorb impact noise such as footsteps and vibrations.
How do joist insulation strips reduce noise?
SilentJoist works by acoustic decoupling. The 3mm thick wool layer sits between the joist and floor, reducing direct contact and limiting vibration transfer.
This helps to:
– Reduce impact noise from footsteps
– Improve acoustic comfort in rooms below
– Minimise sound travelling through the structure
Where should I install SilentJoist strips?
SilentJoist strips are used in floor constructions and should be installed:
– On top of timber joists
– Beneath floorboards or subfloors
– In new build, retrofit, and timber frame projects
What are the dimensions of SilentJoist rolls?
Each SilentJoist roll is supplied in:
– Length: 10 metres
– Width: 100mm (4 inches)
– Thickness: 3mm
How many rolls come in a pack?
SilentJoist felt strips are sold individually as single rolls.
How do you install wool joist strips?
1.Roll out SilentJoist onto the joists
2.Ensure full coverage
3.Lay flooring directly on top
Do wool felt strips improve acoustic performance?
Yes. SilentJoist reduces structure-borne sound and improves acoustic comfort.
Are SilentJoist strips a natural alternative to acoustic foams?
Yes. Benefits include:
– Breathable and vapour open
– Flexible and long-lasting
– Free from harsh chemicals
Can SilentJoist be used in new build and refurbishment?
Yes, suitable for both applications.
Do wool joist strips help with impact noise?
Yes. They absorb impact noise like footsteps.
Are SilentJoist strips suitable for breathable construction?
Yes, they are vapour permeable and suitable for natural building systems.
How much SilentJoist do I need?
Each roll covers 10 linear metres of joist.
Are SilentJoist strips environmentally friendly?
Yes, they are made from natural wool and are a low-impact solution.
