Skip to content

Marmox Dry Lining

Did you know… 1 in 4 homes in the UK has solid walls?

More than a third of all the heat loss in an un-insulated home is lost through the walls. Modern UK houses are usually built with cavity walls which can be insulated but most pre-war homes were built with solid walls which let the heat flood out. Solid walls lose twice as much heat as cavity walls – even cavity walls without insulation!

Why insulate your solid walls?

Insulating your solid walls with Marmox board and drylining products are an effective way to stop wasting energy and money at home. In winter, a well insulated house keeps warmth exactly where you need it – indoors. So, insulating your walls will help keep your home warm and use less energy thereby reducing you carbon footprint. It will help you to stop wasting money on your energy bills too.

What could you save?

The Energy Saving Trust is a non-departmental public body monitoring and advising the UK government on energy use, conservation and climate change. Marmox Board is an ENERGY SAVING TRUST RECOMMENDED PRODUCT and the E.S.T has estimated that insulating all the external solid walls of a house would save approximately 1.8 tonnes of CO2 per year. This equates to approximately a £365 reduction in heating bills (estimated figures based on insulating a gas-heated, semi-detached home with three bedrooms).

Why use Marmox Multiboard dry-lining insulation?

Marmox Multiboard dry-lining insulation is made from polystyrene foam with a coating of glass fibre mesh embedded in a polymer-cement mortar. Our dry lining products are completely free of CFCs, HCFs and asbestos, making them safe for use in nearly any environment.

As well as its waterproofing and thermal insulating properties, Marmox Multiboard dry-lining insulation also provides strong load-bearing capabilities, up to 30 tonnes per metre squared, and it is completely unaffected by freezing and thaw cycles.

Our Marmox Multiboard drylining products are both effective and allow for quick installation times. They can be simply attached to walls and other surfaces with a solvent-free adhesive or fixed in place with our special washers or dowels.

Choosing the right Marmox Board dry-lining insulation

At Marmox, our collection of drylining products includes solid Marmox Multiboard panels, which can be easily installed on flat floors, walls and ceilings.

There's also a curved dry-lining insulation board that is extremely flexible and ideal for use in bathroom constructions. It's also perfect for covering architectural features, such as columns and arches. Additionally, the curved dry-lining insulation board can speed up installation, saving both valuable time and money.

The range of Marmox Multiboard drylining products also includes angled boards and pipe boxes, which simplify the boxing-in of exposed pipe work in areas such as bathrooms, kitchens and lofts.

At Marmox, we can provide a variety of drylining products and accessories that help to ensure an effective and reliable dry-lining insulation installation. Options include Marmox Self-Adhesive Waterproof Tape for ensuring good seals, washers with appropriate screws for holding the boards in place, and 60mm and 80mm dowels that make installation fast and simple.

How to identify whether I have solid walls?

If your UK home has solid walls, then it should be suitable for internal insulation. Solid walls are mainly made of brick or stone and are found in most houses built before 1930. The easiest way to tell is from the pattern of the bricks on the outside of your house.

If your home has solid walls, the bricks will tend to be placed head-on and lengthways in an alternating pattern like this.

If your home has cavity walls, the bricks will tend to have a regular pattern like this.

However, an installer will be able to tell you whether you have solid walls or not.

Solid wall insulation can also work for properties with cavity walls that are not suitable for cavity wall insulation and other non-traditional housing types.

How to Install Marmox Drylining Products

The great advantage of Marmox Multiboard drylining products is their weight. A 10mm board weighs just over 2.5kg and a 20mm board just 3kg so they can be transported and fitted by just one person.

The thicker the board, the better the thermal insulation will be however in most situations our 60mm thick board would be impractical because that would take up too much space and block your windows! The most popular thicknesses are 20mm and 30mm and because it’s relatively thin, 10mm on reveals.

Plasterboard adhesive is NOT suitable – tile adhesive should be used.


If fitting to a flat and exposed brick, block, concrete or plastered wall, any size board can be fixed using a continuous bed of tile adhesive. Not having any air gap between the board and the wall is marginally preferable since it eliminates the slight risk of interstitial condensation.


If a wall is uneven, has a crumbly surface or is of a material that is not suitable for to bond with tile adhesive, Marmox Multiboards are fixed using either Marmox dowel fixings / screws and Marmox washers supported with dabs of tile adhesive. Board thickness should be at least 12.5mm if using this method.

It is recommended that for dotting and dabbing, at least 15 fixing points per long board and 9 fixing points per short board should be used. All the edges of our drylining products must be secure and exhibit no movement.


Boards can be fitted directly to timber or metal studwork in accordance with the main fitting instructions which state that screws and washers need to be used every 30cm along each member. If using 20mm or thicker the centres can be at 600mm.

In methods 2 and 3, consideration should be given to whether there is any dampness in the solid wall. If there is, leaving a gap is not recommended as it could accentuate the condensation problem already existing. When the wall is not absolutely dry, the board should be fitted using the continuous bed of adhesive method. Obviously if dampness is a significant, this must be addressed before masking the problem because Marmox is not a cure for a damp wall.

A Useful tip: if a thin coating of finishing plaster only is to be applied, it should be appreciated that the thickness of the plastic and metal washers is 1mm whereas the fixing dowels are 4mm so more plaster would be required if using dowels.

Other Benefits of Marmox Drylining products

The waterproof core of the Marmox Multiboard has a thermal conductivity of between 0.028 to 0.034 W/mK. The material is fire resistant extruded polystyrene which is the most effective thermal insulation material possible to be made into thin, rigid insulation boards.

Marmox dry lining reduces the temperature gradient between the outside of the wall to the inside and will therefore reduce condensation. Although insulation is important, it should never be assumed that condensation and mould growth can be controlled by insulation alone, ventilation must always be considered. Whether there is any damp inherent in the wall must also be determined before carrying out any dry-lining. If there is a problem with water ingress, this must be stopped before fitting the Marmox as ‘interstitial’ condensation may occur if not attended to. Alternatively, for damp areas such as basements, specialist polyethylene cavity drain membranes can be used. Professional advice must be sought in these circumstances.

Marmox: supplying dry-lining insulation

As specialists in the design and manufacture of construction and drylining products, Marmox has over 40 years of experience in the industry. Our drylining products are made to be of the highest quality and with our dedication to innovation, we are constantly looking for ways to improve our products in order stay at the head of market trends.All of our dry-lining insulation products are available through our stockists and we're able to provide systems that meet specific customer requirements. They are recommended by the Energy Saving Trust and The Tile Association, and are certified by the BBA (British Board of Agrement).Of course, if you have any questions about our drylining products and insulation systems, please don't hesitate to get in touch. We work hard to provide the best possible customer service and we'll be happy to discuss everything from installation instructions, to technical specifications for all of our drylining products.

For Further Advice

Consult the Energy Saving Trust ( for the latest advice on insulation and saving energy. 

With regard to compliance with the Housing Health and Safety Rating System(HHSRS). The BBA accredited product can help compliance with these regulations inasmuch that it is a product that a Local Authority would accept or would not class as a ‘category A’ hazard.