More from this brand
- 27 dB Rw acoustic barrier for ceiling voids
- 13 mm thin and flexible for easy fitting
- Fire rated C-s2, d0 to EN 13501-1
- Dust-free, mineral fibre-free construction
- Ideal for plenum spaces and clean areas
In Stock
- Brand: Siderise Special Products Ltd
- Model: Siderise FLX
- Weight: 26.47kg
- Dimensions: 2,000mm x 1,200mm x 13mm
- SKU: Siderise FLX
- Product code: P1-4122
- MPN: Siderise FLX
Options available
The Siderise FLX Flexible Acoustic Barrier is a lightweight, multi-layer composite sheet designed to be freely suspended in ceiling voids above partition lines.
Offering an acoustic performance of 27 dB Rw (tested to BS EN ISO 140-3:1995), it significantly improves sound separation between adjacent rooms by reducing flanking noise through shared ceiling spaces.
Unlike mineral fibre-based solutions, the FLX barrier is virtually dust-free and non-irritant, making it ideal for use in sensitive environments such as healthcare, education, laboratories, and ceiling voids that double as return air plenums.
The product’s thin, flexible 13 mm profile and surface weight of 11 kg/m² allow it to be easily shaped around services and obstructions, making it highly versatile and practical for both new builds and retrofits.
Specification:
Thickness: 13mm
Width: 1200mm
Length: 2000mm
Dimensions: 2.00m (W) x 1.20m (L) x 40mm (T)
Reaction to Fire: C-s2, d0 (to EN 13501-1)
Acoustic performance: 27 dB Rw (BS EN ISO 140‑3:1995)
Composition: Multi-layer composite, non-mineral, dust-free
Installation: Free-hanging via soffit clamping with steel angles
Overlap requirement: 75 mm vertical joints, sealed with foil tape
Weight: 11 kg/m²
Siderise FLX Flexible Acoustic Barrier for Suspended Ceilings Features:
· 27 dB Rw sound reduction, tested to BS EN ISO 140-3:1995
· Flexible and thin – just 13 mm thick, easy to handle and install
· Mineral fibre-free & virtually dust-free – safe for clean environments
· Fire rated C-s2, d0 to EN 13501-1 – suitable for return air plenums
· Free-hanging installation – easily clamped to soffits with standard fixings
· Ideal for sensitive or occupied areas – low disruption, high performance
· Lightweight (11 kg/m²) – allows for ease of handling and positioning
FLX Flexible Acoustic Barrier for Suspended Ceilings Applications:
· Suspended ceiling voids above partition walls
· Environments where dust and fibres must be minimised (e.g. clean rooms)
· Return air plenums requiring acoustic treatment
· Healthcare, laboratories, schools, and commercial buildings
· Retrofit acoustic upgrades with limited access
· Areas with obstructions such as ductwork or cable trays
FLX Flexible Acoustic Barrier for Suspended Ceilings Installation Guide:
· Prepare the area
Ensure access to soffit and confirm void space above partition.
· Top edge fixing
Clamp the FLX sheet to the soffit using mild steel angles; let it hang freely.
· Overlap & seal joints
Overlap adjacent sheets by at least 75 mm, fix with insulation pins, and seal with foil tape.
· Accommodate services
For cables/ducts, use star or slit cuts, return the flaps, and wrap with FLX strips.
· Base return or fix
Either clamp the base or return excess 150 mm above the ceiling for full acoustic coverage.
· Final inspection
Confirm coverage, seal integrity, and alignment along partition line.
*Further information may be found in our Downloads section.
Fairly easy access to all PDF files.
Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet
| specification | |
| Board covarage | 2.40 m2 |
| Length | 2000mm |
| Material | Multi-layer composite, non-mineral, dust-free |
| Size | 13mm x 1200mm x 2000mm |
| Thickness | 13mm |
| Width | 1200mm |
| Fire Classification | C-s2, d0 (to EN 13501-1) |
| Slab Coverage | 2.40m2 |
| Coverage | 2.40m2 |
| Fire performance | C-s2, d0 (to EN 13501-1) |
| Shipping method | Palletised delivery |
| Grade | 11 kg/m² acoustic barrier |
| Sound insulation reduction | Achieves 27 dB Rw reduction |
| Applications | Healthcare, laboratories, schools, and commercial buildings |
| Fixing method | Free-hanging via soffit clamping with steel angles |
| Foil faced | Yes |
| ETA Notification | Yes |
| Features | Flexible and thin only 13 mm thick, easy to handle and install |
| Manufacturer | Siderise Insulation® |
We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')
Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.
We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776
We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.
INSTALLERS
No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.
4 TIPS FOR CHOOSING THE BEST INSULATION INSTALLER
1. Thermal inspection picture in portfolio
It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.
2. Reviews
Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.
3. Compare prices
Comparing prices will also ensure companies can’t take advantage of you and give you a fair price.
4. Word of Mouth
The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.
Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.
https://www.nia-uk.org/find-an-installer/
https://www.ratedpeople.com/local-thermal-insulation
STOCKIST
We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.
