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125mm DriTherm 37 Knauf Cavity Insulation Slab ǀ pack of 6

125mm Earthwool Insulation DriTherm 37 Standard Cavity Wall Slab Knauf - pack of 6
125mm Earthwool Insulation DriTherm 37 Standard Cavity Wall Slab Knauf - pack of 6
125mm Earthwool Insulation DriTherm 37 Standard Cavity Wall Slab Knauf - pack of 6
125mm Earthwool Insulation DriTherm 37 Standard Cavity Wall Slab Knauf - pack of 6
125mm DriTherm 37 Knauf Cavity Insulation Slab ǀ pack of 6
  • BBA Certified
  • Non-Combustible
  • Glass Mineral Wool Cavity Batts
  • Building Regulations: Class ‘O’ 
  • Fire performance: Euroclass A1
Estimated delivery:
In Stock
£ 43.74
Ex VAT: £ 36.45
  • Brand: Knauf®
  • Model: DriTherm 37 - 125mm
  • Dimensions: 1,200mm x 455mm x 125mm
  • SKU: 125mm-37
  • Product code: P1-2111
  • MPN: 125mm-DriTherm-37

Options available

125mm DriTherm 37 Glass Mineral Wool Slab is a non-combustible, water-repellent cavity insulation slab with a certified thermal conductivity of 0.037W/mK for use in masonry full fill cavity wall applications.

Knauf Cavity Slabs are highly durable, odourless, rot proof, non-hygroscopic, does not sustain vermin and will not encourage the growth of fungi, mould or bacteria.

125mm Cavity Slabs are manufactured using Knauf ECOSE Technology with an excellent Euroclass A1 reaction to fire classification.

DriTherm Cavity Slabs are BBA certified for use in all exposure zones, including those in very severe areas.

They are approved for use in buildings up to 12m high in any exposure zone and for use in multi-storey applications up to 25m in height.

Slabs contain no ozone-depleting substances or greenhouse gases.

Knauf Glass and Rock Mineral Wool are easier to install correctly than other insulation materials such as rigid boards.

Earthwool Cavity Insulation Slabs adapt to any slight imperfections in the substrate and knit together, eliminating any air gaps (thermal bridging)

The absence of air gaps is crucial to achieving high level of performance in the relevant application.

Knauf Dirtherm 37 Standard Insulation Cavity Slabs are available in a range of thicknesses: 50mm, 65mm, 75mm, 85mm, 100mm, 125mm and 150mm.




Thickness: 125mm

Width: 455mm

Length: 1200mm

Finish: Unfaced

Slab Coverage: 0.545m2

Pack Coverage: 3.28m2

R-Value: 3.35m2K/W

Thermal Conductivity: 0.037 W/mK

Vapour Resistivity: 5.00MNs/g.m.

Surface Spread of Flame: Class 1 

Building Regulations: Class ‘O’ 

Fire performance: Euroclass A1 (non-combustible)


Handling, Cutting and Storage:

 · Knauf Cavity Slabs are easy to handle and install, being lightweight and easily cut to size, where necessary. 

 · Cavity Slabs are supplied in recyclable polythene packs (4-LDPE) which are designed for short term protection only. 

 · For longer term protection on site, the product should either be stored indoors, or under cover and off the ground. 

 · DriTherm Cavity Slabs should not be left permanently exposed to the weather conditions.


Certification and Standards:

 · Manufactured in accordance with BS EN 13162.

 · ISO 50001 Energy Management Systems.

 · ISO 14001 Environmental Management Systems.

 · ISO 9001 Quality Management Systems.


*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 3.28 m2
Length 1200mm
Material Glass Mineral Wool
Pack Coverage 3.28m2
Profile Standard Cavity Slab
R-Value 3.35m2K/W
Thermal Conductivity 0.037 W/mK
Thickness 125mm
Width 455mm
Vapour Resistivity 5.00MNs/g.m.
Slab Coverage 0.545m2
Building Regulations Class ‘0’ 
Coverage 3.28m2
Fire performance Euroclass A1 (non-combustible)
Finish Unfaced
Applications Full-fill Masonry Cavity Wall
ECOSE Technology Yes
Features Non-combustible ǀ Water-repellent
Manufacturer Knauf DriTherm®

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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.
125mm Earthwool Insulation DriTherm 37 Standard Cavity Wall Slab Knauf - pack of 6
125mm DriTherm 37 Knauf Cavity Insulation Slab ǀ pack of 6
£ 43.74