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120mm Terrawool TW50 Acoustic Insulation Slab ǀ pack of 4

120mm Terrawool TW50 Acoustic Insulation Slab ǀ pack of 4
  • Terrawool TW50 Sound Insulation Slab
  • 120mm Acoustic Slab, Density: 50kg/m3
  • Thermal and Acoustic Stone Wool Insulation
  • Thermal Conductivity: 0.035W/mK
  • Fire performance: Euroclass A1 Non-combustible
Estimated delivery:
In Stock
£ 59.88
Ex VAT: £ 49.90
  • Brand: Terrawool®
  • Model: 120mm TW50 Terrawool
  • Dimensions: 1,200mm x 600mm x 120mm
  • SKU: 120mm
  • Product code: P1-2407
  • MPN: Terrawool TWABL50120

Options available

120mm Terrawool TW50 Sound Insulation Slab is a standard density (50kg/m3) non-combustible thermal and acoustic stone wool insulation slab used to insulate the floors, internal partition walls and separating wall applications.

Terrawool TW50 Insulation Slab is a high-performance recyclable and durable product with a certified thermal conductivity of 0.035W/mK designed for all types of construction to achieve a high fire rating and sound insulation.

The TW50 Sound Insulation Slabs have achieved A1 euro class, which is the highest fire rating for non-combustible material. 

Using Thermal and Acoustic Slabs significantly reduce the heat and cold loss through the walls and floors.

TW50 can easily be fitted around the brackets and provides a continuous thermal performance with the help of random fibre orientation.

Thermal and Acoustic Terrawool Insulation Slabs are easy to cut and shape with a large bladed knife or saw.

Terrawool TW50 is available in standard slab dimensions: 1200mm x 600mm.

TW50 insulation slabs can be produced unfaced, foil faced, foil faced both sides or white and black tissues faced.

For acoustic insulation slab facing variations please contact us.




Width: 600mm

Length: 1200mm

Pack Quantity: 4

Slab Coverage: 0.72m2

Pack Coverage: 2.88m2

Finish: Unfaced

Density: 50kg/m3 

R-Value: 3.36m2K/W

Thermal Conductivity: 0.035W/mK

Vapour Resistivity: Negligable, Water Repellent

Building Regulations: Class ‘O’ 

Fire performance: Euroclass A1 (non-combustible)


Key points:

 · Formaldehyde binder free.

 · Excellent thermal performance.

 · Non-combustible product A1 Fire rating.

 · Single acoustic slab for multi-applications.

 · Excellent sound absorption, high levels of sound reduction. 

 · Multi-purpose product range which can be used to insulate a wide range of applications on site.

 · Thermal conductivity (lambda) of 0.035W/mK.

 · Great Fire Performance Euroclass A1.

 · Free from CFCs, HCFCs

 · Odorless, non-hygroscopic, and rot proof product.

 · Easy to cut with a large bladed knife or saw.


Main applications:

 · Ground floors.

 · Internal floors.

 · Separating floors.

 · Fabrication.

 · Pitched roofs at rafter level.

 · Internal walls.

 · Acoustic partitions.

 · Light steel frame walls.

 · Timber frame walls.


*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 

Board covarage 2.88 m2
Colour Light brown
Density 50kg/m3 
Length 1200mm
Material Stone wool
Pack Coverage 2.88m2
Pack Quantity 4
Profile Square Edge
R-Value 3.36m2K/W
Thermal Conductivity 0.035W/mK
Thickness 120mm
Width 600mm
Vapour Resistivity Negligable, Water Repellent
Slab Coverage 0.72m2
Building Regulations Class ‘0’ 
Coverage 2.88m2
Fire performance Euroclass A1 (non-combustible)
Finish Unfaced
Quantity 4
Shipping method Articulated Vehicle ǀ Courier
Applications Walls ǀ Ceilings ǀ Floors ǀ Roofs
Foil faced No
ETA Notification Yes
Features Non-combustible ǀ A1 Class ǀ 50kg/m3
Manufacturer Terrawool®

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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.


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.


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.



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.
120mm Terrawool TW50 Acoustic Insulation Slab Thermal Acoustic and Fire Performance (pack of 4)
120mm Terrawool TW50 Acoustic Insulation Slab ǀ pack of 4
£ 59.88