Menu
Your Cart

Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings

Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
  • 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
Estimated delivery:
In Stock
£ 275.88
Ex VAT: £ 229.90
  • 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®

Write a review

Note: HTML is not translated!
Bad Good

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.checkatrade.com/

https://www.mybuilder.com/

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.

 

Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
Siderise FLX Flexible Acoustic Void Barrier for Suspended Ceilings
£ 275.88