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We supply cavity slabs from leading manufacturers such as Knauf Insulation and Rockwool. At Trade Insulations, we take pride in providing top brands at trade prices. Our cavity slabs come in a variety of thicknesses and sizes.
Cavity slab insulation is used in cavity walls. Most cavity slab insulation products can be friction-fitted for ease of use. Our cavity slab product range boasts thermal, acoustic, fireproof, and water repellent properties. In addition to this, cavity slab insulation such as the Dritherm range is rot proof, odorless, non-hygroscopic. This means they do not encourage vermin and also the growth of mould, fungi, or bacteria. Full specifications of the products can be found on the product pages.

We offer only our very best prices on cavity slab insulation!

POPULAR
18% OFF
-18%
Knauf Dritherm 32 Ultimate Slab

Knauf Dritherm 32 100mm Ultimate Cavity Slab (1200mm x 455mm) – 3.27m2 pack

£33.99 ex VAT
POPULAR
20% OFF
Knauf Dritherm 37 Cavity Slabs

Knauf Dritherm 37 100mm Standard Cavity Slab (1200mm x 455mm) – 6.55m2 pack

£31.99 ex VAT
POPULAR
Rockwool RW6 Slabs

Rockwool 100mm RWA45 Acoustic Insulation Slab (1200 x 600mm) – 2.88m2 pack

£21.69 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi – 1200 x 400 x 100mm – 86.4m2 pallet

£827.74 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 100mm – 4.32m2 pack

£38.50 ex VAT

Knauf Dritherm Standard Cavity Slab 37 50mm (1200mm x 455mm) – 6.55m2 pack

£22.99 ex VAT
Eurowall By Recticel

Recticel Eurowall 100mm Cavity Wall Board (1200mm x 450mm) – 5.4m2 pack

£89.99 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 140mm – 69.12m2 pallet

£865.54 ex VAT
Rockwool RW6 Slabs

Rockwool RW3 50mm Acoustic Insulation Slab (1200 x 600mm) – 5.76m2 pack

£39.60 ex VAT
Rockwool RW6 Slabs

Rockwool RWA45 50mm Acoustic Insulation Slab (1200 x 600mm) – 6.48m2 pack

£26.52 ex VAT
Rockwool RW6 Slabs

Rockwool RWA45 75mm Acoustic Insulation Slab (1200 x 600mm) – 4.32m2 pack

£27.46 ex VAT
Knauf Dritherm 32 Ultimate Slab

Knauf Dritherm Ultimate Cavity Slab 32 75mm (1200mm x 455mm) – 114.8m2 pallet

£950.00 ex VAT
Eurowall By Recticel

Recticel Eurowall 50mm Cavity Wall Board (1200mm x 450mm) – 10.8m2 pack

£94.00 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi – 1200 x 400 x 140mm – 46.08m2 pallet

£644.07 ex VAT
Rockwool RW6 Slabs

Rockwool RW3 100mm Acoustic Insulation Slab (1200 x 600mm) – 2.88m2 pack

£34.72 ex VAT
Isover 32 Cavity Wall Slabs

100mm Isover Cavity Wall Slabs 32 (CWS 32) – 1200 x 455mm – 3.28m2 Pack

£42.50 ex VAT
Isover 34 Cavity Wall Slabs

125mm Isover Cavity Wall Slabs 34 (CWS 34) – 1200 x 455mm – 65.6m2 pallet

£860.00 ex VAT
Isover 34 Cavity Wall Slabs

150mm Isover Cavity Wall Slabs 34 (CWS 34) – 1200 x 455mm – 65.6m2 pallet

£960.00 ex VAT
Knauf Dritherm 34 Cavity Slabs

Knauf Dritherm Super Cavity Slab 34 100mm (1200mm x 455mm) – 131.04m2 pallet

£999.00 ex VAT
Knauf Dritherm 32 Ultimate Slab

Knauf Dritherm Ultimate Cavity Slab 32 125mm (1200mm x 455mm) – 2.18m2 pack

£30.99 ex VAT
Eurowall By Recticel

Recticel Eurowall 90mm Cavity Wall Board (1200mm x 450mm) – 5.4m2 pack

£105.00 ex VAT
Recticel Eurowall Plus Board

Recticel Eurowall Plus Full Fill Cavity Wall Insulation Board (1190mm x 450mm) – 115mm – 4.32m2 pack

£145.00 ex VAT
Recticel Eurowall Plus Board

Recticel Eurowall Plus Full Fill Cavity Wall Insulation Board (1190mm x 450mm) – 140mm – 4.32m2 pack

£165.00 ex VAT
Recticel Eurowall Plus Board

Recticel Eurowall Plus Full Fill Cavity Wall Insulation Board (1190mm x 450mm) – 90mm – 5.4m2 pack

£145.00 ex VAT
Rockwool RW6 Slabs

Rockwool RWA45 40mm Acoustic Insulation Slab (1200 x 600mm) – 138.24m2 pallet

£533.45 ex VAT

Knauf Dritherm Ultimate Cavity Slab 32 150mm (1200mm x 455mm) – 2.18m2 pack

£34.50 ex VAT
Eurowall By Recticel

Recticel Eurowall 40mm Cavity Wall Board (1200mm x 450mm) – 12.96m2 pack

£127.50 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 180mm – 25.92m2 pallet

£540.01 ex VAT
Isover 36 Cavity Wall Slabs

100mm Isover Cavity Wall Slabs 36 (CWS 36) – 1200 x 455mm – 6.55m2 pack

£39.99 ex VAT
Knauf Dritherm 34 Cavity Slabs

Knauf Dritherm Super Cavity Slab 34 75mm (1200mm x 455mm) – 163.8m2 pallet

£950.00 ex VAT
Eurowall By Recticel

Recticel Eurowall 30mm Cavity Wall Board (1200mm x 450mm) – 17.28m2 pack

£129.99 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 120mm – 69.12m2 pallet

£874.31 ex VAT

Rockwool RW6 100mm Acoustic Insulation Slab (1200 x 600mm) – 34.56m2 pallet

£1,260.23 ex VAT
Rockwool RW6 Slabs

Rockwool RWA45 60mm Acoustic Insulation Slab (1200 x 600mm) – 92.16m2 pallet

£560.46 ex VAT
Isover 34 Cavity Wall Slabs

100mm Isover Cavity Wall Slabs 34 (CWS 34) – 1200 x 455mm – 87.4m2 pallet

£860.00 ex VAT
Eurowall By Recticel

Recticel Eurowall 70mm Cavity Wall Board (1200mm x 450mm) – 7.56m2 pack

£115.00 ex VAT
Eurowall By Recticel

Recticel Eurowall 75mm Cavity Wall Board (1200mm x 450mm) – 6.45m2 pack

£99.90 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 60mm – 103.68m2 pallet

£588.23 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 70mm – 92.16m2 pallet

£621.10 ex VAT
Rockwool Rainscreen Duo Slab

Rockwool Rainscreen Duo Slab – 600mm x 1200mm x 100mm – 34.56m2

£1,157.17 ex VAT
Rockwool RW6 Slabs

Rockwool RWA45 25mm Acoustic Insulation Slab (1200 x 600mm) – 11.52m2 pack

£28.21 ex VAT
Knauf Dritherm 34 Cavity Slabs

Knauf Dritherm Super Cavity Slab 34 150mm (1200mm x 455mm) – 81.9m2 pallet

£950.00 ex VAT
Rockwool Flexi Slab

ROCKWOOL Flexi Slab – 1200 x 600 x 90mm – 86.4m2 pallet

£678.36 ex VAT
Rockwool RW6 Slabs

Rockwool RW4 100mm Acoustic Insulation Slab (1200 x 600mm) – 34.56m2 pallet

£781.22 ex VAT
Rockwool RW6 Slabs

Rockwool RW4 50mm Acoustic Insulation Slab (1200 x 600mm) – 69.12m2 pallet

£1,185.36 ex VAT
Rockwool RW6 Slabs

Rockwool RW4 75mm Acoustic Insulation Slab (1200 x 600mm) – 46.08m2 pallet

£998.20 ex VAT
Knauf Dritherm 34 Cavity Slabs

Knauf Dritherm Super Cavity Slab 34 125mm (1200mm x 455mm) – 98.28m2 pallet

£950.00 ex VAT
Eurowall By Recticel

Recticel Eurowall 60mm Cavity Wall Board (1200mm x 450mm) – 8.64m2 pack

£89.99 ex VAT

What are Cavity Slabs?

Cavity slabs are a type of insulation used to insulate cavity walls. Cavity slabs come in a variety of sizes, styles, and thicknesses. For example, Dritherm cavity slabs by Knauf are a mineral wool slab, which are manufactured with a water repellent additive. They are also rot-proof, which deters the growth of mold, fungi, or bacteria. Cavity slab insulation is popular as it is easy to install and provides excellent thermal performance.
Cavity slabs work by filling the air space of a cavity wall with material that inhibits heat transfer, cavity wall insulation is used to reduce heat loss through that wall.

What are Cavity Walls?

Cavity walls have a hollow center. As a result, they are composed of two “skins” separated by a hollow chamber (cavity). Skins are usually masonry, such as bricks or cinder blocks. The masonry material absorbs rainwater and humidity, making it an extremely absorbent material.

Building cavity walls became prevalent in the United Kingdom during the 1920s. As early as the 4th century, stone ties were used to connect the two skins. During the 20th century, metal ties were used. Early cavity widths were narrow so that moisture could be reduced from getting into the interior of buildings. In the 1970s, cavity insulation became standard, and it became mandatory in the 1990s.

By insulating cavity walls, a house is also less likely to lose heat through its walls and therefore be kept warm more efficiently. Cavity wall insulation can also prevent convection as well as make a house warmer by preventing heat from escaping. About a third of the heat lost by an uninsulated home escapes through its walls.

Why use Cavity Slabs?

Cavity slab insulation provides excellent thermal performance within the cavity wall. This can help reduce energy bills by providing a building with better insulation properties. Cavity slabs such as the Dritherm range are water repellent and will not encourage the growth of mold, fungi, or bacteria. In addition to this, they will not attract the likes of vermin and therefore improve the health and safety of the occupants of a building.
They are easy to install and very cost-effective. In the winter months, cavity slab insulation can reduce heat loss due to convection. This is similar to putting a hot drink in a flask. The heat is retained and therefore the need for heating is reduced. This reduction is excellent for the environment.

The water repellent properties of a cavity wall slab can prevent condensation. Moisture from condensation can cause mold to grow. The insulation itself restricts moisture from passing through the walls. Water can pass through the outer wall because it is porous. Cavity slabs will trap the water and allow it to run down to the ground rather than through the inner wall. By using a water repellent cavity slab, we essentially remove the environment for mold to form.

How to install cavity slabs

Cavity slabs can be easily installed. Below is a guide that we wrote for installing Isover, however, most cavity slabs can be installed using the same process. Before you begin, you will need wall ties. These are vital for securing the structural integrity of a wall. It is vital that wall ties are correctly installed to prevent damp issues, cracking, or in severe cases, wall collapsing.

When installing cavity slabs, build up the first section of the leading leaf to include the first row of wall ties. Ideally, the insulation needs to start a minimum of 150mm below DPC level to provide effective edge insulation as well as reducing thermal bridging at the junction.

It is important to clean off any mortar snot protruding into the cavity from either cavity trays or wall ties.

The cavity insulation slab should then be positioned against the masonry (between the wall ties). Make sure the drips are halfway across the top of the insulation. If the insulation needs cutting then use a sharp knife and a straight edge for an even fit.

Once you have done these steps, you then need to build up the second leaf. This should be built to the top of the insulation. The wall ties need to slightly slope away from the internal to the external leaf. Any excess mortar needs to be removed from the cavity face to prevent mortar droppings on the top of the insulation. The butt joints need to be tightly butted and the vertical joints need to be staggered from course to course.

Cheap Cavity Slabs

If you are looking for cheap cavity slabs, we sell top brands at trade prices. Why pay more for your cavity slabs when you could use Trade Insulations? You don't need an account to place an order with us and we keep our trade prices open to everybody. The Dritherm range from Knauf Insulation is a top seller and is available in a whole host of variations.

If you need any help or advice regarding insulation simply get in touch with us. Our friendly team is always happy to help!