Dritherm 32 Ultimate Cavity Slab By Knauf Insulations

Cavity wall insulation was made compulsory in the 1990s to help homes save energy. If your home was built after the 1920s you are likely to have cavity walls which means you will need to insulate them. It is important that the space or gap between two brick walls is insulated, to restrict or keep heat loss in a home or building to a bare minimum, and Dritherm 32 are the ideal cavity batts for this application. 

Among the many insulation products we stock, Knauf Dritherm 32 cavity slab insulation is supplied to you at the lowest possible prices in the UK.  

At Buy Insulation Online, we store Knauf Dritherm 32 100mm, 150mm, 75mm and 125mm thicknesses. You can easily choose the thickness you need from the options above and buy 100mm Knauf Dritherm 32 or any other thickness of the cavity wall batt online. Buy Insulation Online is one of the best places to buy Knauf Dritherm 32 online. 

What is Dritherm 32?

Dritherm 32 is a cavity batt insulation solution manufactured by the renowned Knauf Insulations. Mineral wool cavity slabs are semi-rigid and specially made to provide and improve the thermal insulation of masonry cavities. By using glass wool insulation batts in external full-fill masonry cavity walls you improve the energy efficiency, comfort and acoustic performance in a building.

Knauf cavity wall slabs are British Board approved and can be used in buildings up to 12m high in any exposure zone. They are approved for use in all exposure zones and in multi-storey buildings up to 25m tall.

Some of the best features of the Dritherm 32 Cavity wall include:

Make:

Dritherm cavity slabs are semi-rigid and are perfectly made to suit standard vertical wall tie spacings. The standard size of 1200 x 455mm wide glass mineral wool slab enables a perfect fit within the masonry cavity external walls and fully fills the cavity.

Thermal Conductivity:

Knauf Insulation Dritherm 32 cavity slab has a better and lower K-Value compared to Dritherm 37. With its low thermal conductivity of 0.032 W/mK, these Earthwool cavity slabs make a perfect candidate for insulating external full-fill cavity walls

Furthermore, Knauf batt insulation can be knit together to enhance its insulating properties. This 'knitting' creates a closed joint with adjacent slabs and ensures no gaps in the insulation of masonry cavity external

Water-Repellant Dritherm 32 slabs:

This cavity batt insulation does not absorb water. Dritherm slab 32 is a water-repellent glass wool insulation. Fibreglass repels water by nature and hence does not support the growth of moulds or vermin. In fact, it helps prevent condensation on walls.

Furthermore, since these water-repellent glass mineral wool slabs can be closely packed together for use in external full-fill masonry, they do not allow air gaps or spaces wherein the water could enter the assembly.

Dritherm® cavity slab 32 is not known to cause dampness in cavity walls by itself. However, if you have pre-existing moisture issues in the cavities, Dritherm 32 can enhance the problem. So it is necessary to do pre-installation checks and address any moisture-related problems before you install cavity wall insulation. 

Fire Insulation:

Along with superior insulation, Dritherm 32 is also known to give exceptional fire resistance. It is a non-combustible glass mineral wool insulation manufactured using top-quality fibreglass. These cavity slabs are rated A1 by Euroclass, which means they have the best possible reaction to fire classification. Dritherm cavity slab 32 is non-combustible. 

Ecose Technology

Knauf Insulations' distinctive bio-binder-based technology is used to create Dritherm 32. It is made with nearly 80% recycled glass. Other materials used to make Dritherm 32 are also obtained sustainably.

The use of Ecose Technology makes the cavity wall lagging soft to the touch, simple to work with, easy to handle and install. As it is bio-based they release low levels of dust or hazardous fibres during installation. Knauf Dritherm 32 contributes to better air quality.

To know more about the Ecose technology, used in making Dritherm 32 100mm cavity slabs, please refer to the manufacturer's website.

Easy to Install:

Earthwool Dritherm cavity slabs come in a standard size of 455mm x 1200mm, which is the optimal size for batts installed within cavities. It is semi-rigid or rigid slabs, made for a perfect fit between cavity spaces. They come in various thicknesses like 75mm, 100mm, 125mm and 150mm to suit your application.

Though Dritherm 32 releases fewer fibres as it is made using ecose® technology, it is still recommended that you use gloves and masks and follow standard safety practices while installing cavity wall insulation batts. Designed for use in external walls, Dritherm 32 is also odourless and rot-proof which improves their ease of use in external masonry cavities.

Dritherm 32 is BBA approved:

Cavity wall lagging must be BBA or CIGA-approved. Only then will the insulation last longer and you will be tension-free. Also, as mentioned earlier a pre-installation check is a must before installing any insulation in the cavity spaces.

Dritherm 32 has BBA approval. The Knauf cavity wall insulation has provided reliable thermal performance for many years, no matter the building type. Dritherm 32 is also suitable for use in high-rise buildings, for buildings as high as 12m. 

Dritherm 32 is environmentally friendly:

Knauf Dritherm cavity wall batts are made with sustainably sourced materials. Their manufacturing process does not release any CFCs or HCFCs. Additionally, Dritherm 32 has zero ozone-depleting potential and negligible global warming potential.

Which is better -Dritherm 37 Standard or Dritherm 32 Ultimate Cavity Batt?

Dritherm 37 and 32 do not differ very much. Both Knauf Dritherm cavity slabs are semi-rigid or rigid made by Knauf insulations using Ecose technology.

Both Knauf Dritherm cavity batts are 455mm wide to suit standard vertical space ties of the external masonry cavity walls.

The difference lies in their thermal conductivity and therefore their price. Dritherm 37 is cheaper compared to Dritherm 32. This is mainly because cavity slab 32 ultimate has a better thermal conductivity of 0.032, as compared to the thermal conductivity of 0.037 W/mK of Dritherm 37.

How Knauf Dritherm 32 Cavity Slab Improves Home Energy Efficiency 

By using 100mm Dritherm 32 or Knauf batt insulation of any thickness to insulate cavity walls, you save energy and improve your home's energy efficiency. How? Let us explain.

A cavity is a space between the outer and the inner wall layer. It is commonly found in any home built after the 1920s in the UK. While this space was originally used to stop rainwater from entering your building, it was also noted to be a source of heat loss through walls.

By using Dritherm 32 to completely or partially fill the cavities, you ensure that the heat generated by your radiators stays indoors. Not only that, as mentioned since these are 455mm wide cavity batts they perfectly suit standard vertical wall tie spacings. Plus, the Knauf Dritherm cavity slabs can also be closely placed and 'knit together' leaving no gaps in the insulation, they provide exceptional insulation to your cavities thereby improving the energy efficiency of your home.

Additionally, cavity wall Knauf is water repellent. Therefore they protect your home from water ingress through walls and restrict condensation

The Science Behind the Performance of Dritherm 32 Cavity Slab Insulation

The science behind the performance of Dritherm 32 Cavity Wall Insulation is simple. Dritherm 32 is made of fibreglass which is a very good insulating material. Glass wool is an open-cell insulation that stores heat in the millions of tiny air spaces in its fabric, thereby restricting or minimising heat transfer. Hence, Knauf batt insulation also has exceptional thermal efficiency.

Installing 100mm Knauf Dritherm 32:

Installing cavity batts 100mm or of any thickness for that matter is not a DIY job. Installing insulation in your cavity wall is a professional job and must be carried out by CIGA or BBA-certified personnel with approved products only.