At Trade Insulations, we offer only our best prices on Knauf Dritherm Cavity Slabs. We sell the full range of Knauf Dritherm. This includes Dritherm 32, Dritherm 34 and Dritherm 37. Dritherm by Knauf are cavity slabs designed for use in external masonry cavity walls. If you need any assistance with buying our Dritherm cavity slabs then get in touch.

Showing all 16 results

Filter by Thickness
Filter by Brand

Knauf Dritherm Standard Cavity Slab 37 100mm (1200mm x 455mm)

£30.50 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 100mm (1200mm x 455mm)

£29.85 ex VAT

Knauf Dritherm Standard Cavity Slab 37 50mm (1200mm x 455mm)

£20.48 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 75mm (1200mm x 455mm)

£1,024.41 ex VAT

Knauf Dritherm Super Cavity Slab 34 100mm (1200mm x 455mm)

£991.00 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 125mm (1200mm x 455mm)

£1,028.30 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 150mm (1200mm x 455mm)

£1,046.22 ex VAT

Knauf Dritherm Super Cavity Slab 34 75mm (1200mm x 455mm)

£948.94 ex VAT

Knauf Dritherm Super Cavity Slab 34 150mm (1200mm x 455mm)

£936.03 ex VAT

Knauf Dritherm Super Cavity Slab 34 125mm (1200mm x 455mm)

£929.78 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 85mm (1200mm x 455mm)

£1,030.29 ex VAT

Knauf Dritherm Standard Cavity Slab 37 65mm (1200mm x 455mm)

£1,101.87 ex VAT

Knauf Dritherm Standard Cavity Slab 37 125mm (1200mm x 455mm)

£962.75 ex VAT

Knauf Dritherm Standard Cavity Slab 37 150mm (1200mm x 455mm)

£755.71 ex VAT

Knauf Dritherm Standard Cavity Slab 37 75mm (1200mm x 455mm)

£17.83 ex VAT

Knauf Dritherm Standard Cavity Slab 37 85mm (1200mm x 455mm)

£871.48 ex VAT

What are Dritherm Cavity Slabs?

Dritherm Cavity Wall Slabs are made from glass mineral wool and are designed for cavity wall applications. Dritherm Cavity Wall Insulation slabs are manufactured using Knauf's innovative ECOSE technology. This means the slabs are made using a binder that comes from a rapidly renewable biomaterial rather than petroleum. The manufacturing process uses up to 70% less energy to make. This means that the finished product is soft like cotton wool rather than scratchy or itchy. Traditionally glass mineral wool products are known to be very itchy, however, Knauf Dritherm Slabs are not.

Knauf Dritherm Slabs are designed for use in cavity walls. The insulation slabs by Knauf are semi-rigid or rigid. They boast several properties such as being water repellent and non-combustible. Dritherm Cavity Wall Slabs achieve an A1 non-combustible classification. The slabs themselves are made from glass mineral wool and offer excellent thermal performance. They are to be used in masonry cavity external walls and can be used in buildings up to 12m in any exposure zone. In addition to this, they can be used in multi-story applications up to 25 meters tall.

A big cause of heat loss in buildings is down to cavity walls being empty. Empty cavity walls can cause air movement as well as heat loss. This is why it is important to fill the gaps to reduce energy bills and retain heat in a building. Dritherm Cavity Wall Insulation Slabs are designed to do just this. On our website, you can find the full range of Dritherm Cavity Slabs. These high-performance slabs are designed to use between masonry cavity walls and can be used in both commercial and residential buildings.

Cheap Dritherm Cavity Slabs

You will find cheap Dritherm Slabs on our website. We believe in offering trade prices to the public, which means we can offer our best available price on all insulation slabs. If you are looking for cheap Dritherm cavity slabs, use our website to find a great deal. We take pride in being able to give back to the customer by offering rock bottom prices. At Trade Insulations, our motto is top brands at trade prices.

Dritherm Cavity Slab FAQs

Below you will find the answers to some frequently asked questions that we get about Dritherm Cavity Slabs.

What is the difference between Dritherm Slabs?

You may be wondering what is the difference between Dritherm 32, Dritherm 34 and Dritherm 37. The numbers stated on the product actually refer to the product's thermal conductivity value. For example, Dritherm 32 slabs have a thermal conductivity of 0.032 (W/mK) whereas Dritherm 34 has a thermal conductivity of 0.034 (W/mK). The “Dri” in Dritherm refers to their water repellent additive whereas the “Therm” in Dritherm refers to its excellent thermal performance. Knauf Earthwool Dritherm Cavity Slabs are cut at 455mm wide. This is in line with standard wall tie spacings, which produce a neatly closed joint when used with adjacent slabs. The use of Dritherm Slabs can eliminate air gaps.

Which is better Dritherm 32 or Dritherm 37?

When comparing Dritherm 32 and Dritherm 37, the major difference between the two is the thermal conductivity. Dritherm 32 has 0.032 (W/mK) and Dritherm 37 has 0.037 (W/mK). This means Dritherm 37 rates higher for thermal conductivity. That being said, the slab you use is really down to the project and application. Your architect may be able to let you know which product is more suitable depending on your requirements. We can also offer your advice if you get in touch with us.

Are Dritherm Cavity Slabs Fireproof?

Knauf Dritherm 32, Dritherm 34 and Dritherm 37 are rated with the best possible Euroclass A1 reaction to fire classification. The Euroclass scale is rated from F, which is combustible to A1, which is classed as non-combustible. All Dritherm products are rated A1 and therefore non-combustible. Dritherm Cavity Slabs boast excellent fire protection and can help to minimise the spread of fire. This can potentially save lives as well as minimise building damage.

What are the benefits of using Dritherm Cavity Slabs

Dritherm cavity slabs are designed to fill cavity wall gaps and therefore reduce air movement and heat from escaping. A big advantage of using Knauf Insulation Dritherm Cavity Slabs is that they are uniquely made to be compatible with vertical wall ties. This eliminates the need for retaining discs. The slabs themselves are very easy to install and are also rigid. This means you don't need expensive equipment to install it. The product itself boasts good levels of thermal resistance.

Dritherm Cavity Slabs are made by Knauf, who are environmentally conscious. Knauf Dritherm Cavity Slabs are made using ECOSE technology. This manufacturing technology means that the slabs are made using a natural biomaterial instead of petroleum. Dritherm Cavity Slabs are up to 70% less intensive to create than using typical binders. In addition to this, the product itself boasts excellent thermal performance. This means that the slabs can reduce heat loss in a building, which therefore reduces the energy needed to heat a home. Dritherm Cavity Slabs are eco-friendly and classified as zero ODP and zero Global Warming Potential.

Are Dritherm Cavity Slabs Waterproof

Dritherm Slabs feature a water repellent additive that helps keep them dry. The “Dri” in Dritherm is actually a reference to the water repellent additive that is in the product itself. That being said, Knauf Cavity Slabs are great at repelling water but they are not entirely waterproof. Many people confuse water resistance with waterproofing.

Dritherm Cavity slabs have a good water vapour resistivity of 5.00MNs/g.m. In addition to this, they are non-hygroscopic, which means they do not absorb and retain moisture. The water-resistant properties of the Knauf Dritherm range mean that the slabs also benefit from no rot, vermin or fungus.

What is Full Fill Insulation?

Dritherm Cavity Slabs are used to fully fill empty cavity spaces. This is different from partial fill applications, which are achieved using PIR Insulation Boards. PIR boards are used in cavity spaces to create an air gap rather than fully fill the gap. Dritherm Cavity Slabs fully fill the gap using rigid slabs. The simple difference between partial fill and full fill is that partial fill will only partially fill the gap whereas full fill will fully fill the gap. For a visual representation, you can see the video below –

Can Dritherm Cavity Slabs Be Cut?

Yes, the slabs are designed to be easily cut to size. The cavity slabs themselves are very lightweight and can be cut using a sharp serrated knife. We advise that you wear appropriate clothing and PPE when cutting. This includes cut resistant gloves as well as protective eyewear. If you are concerned about safety precautions then we would always recommend that you consult with a professional.